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☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

Securities registered pursuant to Section 12(b) of the Act:

Title of each class			Trading symbols			Name of each exchange on which registered
Common Shares of Beneficial Interest, $0.01 par value per share			NSA			New York Stock Exchange
Series A Cumulative Redeemable Preferred Shares of Beneficial Interest, par value $0.01 per share			NSA Pr A			New York Stock Exchange
Series B Cumulative Redeemable Preferred Shares of Beneficial Interest, par value $0.01 per share			NSA Pr B			New York Stock Exchange

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes ☒  No ☐

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act. Yes  ☐   No  ☒

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes  ☒    No  ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes  ☒    No  ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of "large accelerated filer," "accelerated filer," "smaller reporting company" and "emerging growth company" in Rule 12b-2 of the Exchange Act.

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report. ☒

If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of the registrant included in the filing reflect the correction of an error to previously issued financial statements. ☐

Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensation received by any of the registrant's executive officers during the relevant recovery period pursuant to § 240.10D-1(b). ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ☐    No  ☒

The aggregate market value of the voting and non-voting common shares of beneficial interest of National Storage Affiliates Trust held by non-affiliates of National Storage Affiliates Trust was approximately $3.1 billion as of June 30, 2023. As of February 26, 2024, 79,977,268 common shares of beneficial interest, $0.01 par value per share, were outstanding.

Portions of the registrant's definitive proxy statement for its annual meeting of shareholders are incorporated by reference into Part III of this Annual Report on Form 10-K.

•market trends in our industry, interest rates, inflation, the debt and lending markets or the general economy;

•our business and investment strategy;

•the acquisition or disposition of properties, including those under contract, and the ability of our acquisitions to achieve underwritten capitalization rates and our ability to execute on our acquisition pipeline;

•the internalization of retiring participating regional operators ("PROs") into the Company;

•the timing of acquisitions or dispositions;

•our relationships with, and our ability and timing to attract additional, PROs;

•our ability to effectively align the interests of our PROs with us and our shareholders;

•the integration of our PROs and their managed portfolios into the Company, including into our financial and operational reporting infrastructure and internal control framework;

•our operating performance and projected operating results, including our ability to achieve market rents and occupancy levels, reduce operating expenditures and increase the sale of ancillary products and services;

•our ability to access additional off-market acquisitions;

•actions and initiatives of the U.S. federal, state and local government and changes to U.S. federal, state and local government policies, regulations, tax laws and rates (and related accounting guidance), and the execution and impact of these actions, initiatives, policies, regulations and laws;

•the state of the U.S. economy generally or in specific geographic regions, states, territories or municipalities;

•economic trends and economic recoveries;

•our ability to obtain and maintain financing arrangements on favorable terms;

•general volatility of the securities markets in which we participate;

•impacts from highly infectious or contagious diseases, including unfavorable changes to economic conditions that could adversely affect occupancy levels, rental rates, expenses and the ability of the Company's tenants to pay rent;

•changes in the value of our assets;

•projected capital expenditures;

•the impact of technology on our products, operations, and business;

•the implementation of our technology and best practices programs (including our ability to effectively implement our integrated Internet marketing strategy);

•changes in interest rates, the degree to which our hedging strategies may or may not protect us from interest rate volatility and the impact of such changes on the economy and our industry;

•our ability to continue to qualify and maintain our qualification as a real estate investment trust for U.S. federal income tax purposes ("REIT");

•availability of qualified personnel;

•the timing of conversions of each series of Class B common units of limited partner interest ("subordinated performance units") in NSA OP, LP (our "operating partnership") and subsidiaries of our operating partnership into Class A common units of limited partner interest ("OP units") in our operating partnership, the conversion ratio in effect at such time and the impact of such convertibility on our diluted earnings (loss) per share;

•the risks of investing through joint ventures, including whether the anticipated benefits from a joint venture are realized or may take longer to realize than expected;

•risks related to or a consequence of natural disasters or acts of violence, pandemics, active shooters, terrorism, insurrection or war that affect the markets in which we operate;

•estimates relating to our ability to make distributions to our shareholders in the future; and

•our understanding of our competition.

National Storage Affiliates Trust is a fully integrated, self-administered and self-managed real estate investment trust organized in the state of Maryland on May 16, 2013. We have elected and we believe that we have qualified to be taxed as a REIT for U.S. federal income tax purposes commencing with our taxable year ended December 31, 2015. We serve as the sole general partner of our operating partnership subsidiary, NSA OP, LP (our "operating partnership"), a Delaware limited partnership formed on February 13, 2013 to conduct our business, which is focused on the ownership, operation, and acquisition of self storage properties predominantly located within the top 100 metropolitan statistical areas ("MSAs") throughout the United States. As of December 31, 2023, we held ownership interests in and operated a geographically diversified portfolio of 1,050 self storage properties located in 42 states and Puerto Rico, comprising approximately 68.6 million rentable square feet, configured in approximately 542,000 storage units, which excludes 39 self storage properties classified as held for sale to be sold to a third party in 2024.

We completed our initial public offering in 2015 and our common shares of beneficial interest, $0.01 par value per share ("common shares"), are listed on the New York Stock Exchange under the symbol "NSA." Our vice chairperson of the board of trustees and former chief executive officer, Arlen D. Nordhagen, co-founded SecurCare Self Storage, Inc. ("SecurCare"), in 1988 to invest in and manage self storage properties. While growing SecurCare to over 150 self storage properties, Mr. Nordhagen recognized a market opportunity for a differentiated public self storage REIT that would leverage the benefits of national scale by integrating multiple experienced regional self storage operators with local operational focus and expertise. We believe that his vision, which is the foundation of the Company, aligns the interests of our participating regional operators ("PROs"), with those of our public shareholders by allowing our PROs to participate alongside our shareholders in our financial performance and the performance of our PROs' "managed portfolios", which means, with respect to each PRO, the portfolio of properties that such PRO manages on our behalf. A key component of this strategy is to capitalize on the local market expertise and knowledge of regional self storage operators by maintaining the continuity of their roles as property managers.

As of December 31, 2023, our PROs managed 333 of our properties. We believe that our PRO structure creates the right financial incentives to align the interest of our PROs with those of our public shareholders. We require our PROs to exchange the self storage properties they contribute to the Company for a combination of OP units and subordinated performance units in our operating partnership or subsidiaries of our operating partnership that issue units intended to be economically equivalent to the OP units and subordinated performance units issued by our operating partnership ("DownREIT partnerships"). OP units, which are economically equivalent to our common shares, create alignment with the performance of the Company as a whole. Subordinated performance units, which are linked to the performance of specific managed portfolios, incentivize our PROs to drive operating performance and support the sustainability of the operating cash flow generated by the self storage properties that they manage on our behalf. Because subordinated performance unit holders receive distributions only after portfolio-specific minimum performance thresholds are satisfied, subordinated performance units play a key role in aligning the interests of our PROs with us and our shareholders. Our PRO structure thus offers PROs a unique opportunity to serve as regional property managers for their managed portfolios and directly participate in the potential upside of those properties while simultaneously diversifying their investment to include a broader portfolio of self storage properties. We believe our PRO structure provides us with a competitive growth advantage over self storage companies that do not offer property owners the ability to participate in the performance and potential future growth of their managed portfolios.

We believe that our national platform, which includes our PRO structure and property management platform, has significant potential for continued external and internal growth. We seek to further expand our national platform by continuing to recruit additional established self storage operators to act as future PROs, pursuing strategic off-market acquisitions, as well as opportunistically partnering with institutional funds and other institutional investors in strategic joint venture arrangements while integrating our operations through the implementation of centralized initiatives, including management information systems, revenue enhancement, and cost optimization programs. We are currently engaged in preliminary discussions with additional self storage operators and believe that we could add one to three more PROs in addition to the PROs we have currently, which will enhance our existing geographic footprint and allow us to enter regional markets in which we currently have limited or no market share.

At the time of our formation, we contemplated that PROs would seek to retire over time, allowing us to internalize the management of such PROs' managed portfolios into our full service internally staffed property management platform, which was initially developed to manage the properties owned by our unconsolidated real estate ventures. Internalization allows us to grow this platform by hiring former PRO employees to continue managing the same portfolios under the same local brands. With each retirement event, we acquire the PRO brand name and related intellectual property and discontinue paying the PRO supervisory and administrative fees and reimbursements. As of December 31, 2023, we have completed three retirement events: SecurCare effective March 31, 2020, Kevin Howard Real Estate, Inc., d/b/a Northwest Self Storage and its controlled affiliates ("Northwest") effective January 1, 2022 and Move It Self Storage and its controlled affiliates ("Move It") effective January 1, 2023.

As a result of Move It's retirement, effective January 1, 2023, management of our properties in the Move It managed portfolio was transferred to us and the Move It brand name and related intellectual property was internalized by us, and we discontinued payment of any supervisory and administrative fees and reimbursements to Move It.

Through our property management platform, we direct, manage and control the day-to-day operations and affairs of certain consolidated properties and our unconsolidated real estate ventures under our iStorage, SecurCare, Northwest and Move It brands. As of December 31, 2023, our property management platform managed and controlled 532 of our consolidated properties, which excludes 39 properties classified as held for sale to be sold to a third party in 2024, and 185 of our unconsolidated real estate venture properties.

The Company had eight PROs as of December 31, 2023: Optivest Properties LLC and its controlled affiliates ("Optivest"), Guardian Storage Centers LLC and its controlled affiliates ("Guardian"), Southern Storage Management Systems, Inc. d/b/a Southern Self Storage ("Southern"), Blue Sky Self Storage LLC, a strategic partnership between Argus Professional Storage Management and Uplift Development Group (formerly known as GYS Development LLC) ("Blue Sky"), affiliates of Investment Real Estate Management, LLC d/b/a Moove In Self Storage ("Moove In"), Hide-Away Storage Services, Inc. and its controlled affiliates ("Hide-Away"), Arizona Mini Storage Management Company d/b/a Storage Solutions and its controlled affiliates ("Storage Solutions"), and an affiliate of Shader Brothers Corporation d/b/a Personal Mini Storage ("Personal Mini").

To capitalize on their recognized and established local brands, our PROs continue to function as property managers for their managed portfolios under their existing brands (which include various brands in addition to those discussed below). Over the long-run, we may seek to continue internalizing our PROs and may brand or co-brand each location as part of NSA.

•Optivest, which is based in Dana Point, California, is one of our PROs responsible for covering portions of the northeast and southwest regions. Optivest managed 86 of our properties located in Arizona, California, Massachusetts, Nevada, New Hampshire, New Mexico, Texas and Utah as of December 31, 2023. Optivest is run by its co-founder, Warren Allan, who has more than 30 years of financial and operational management experience in the self storage industry and is recognized as a self storage acquisition and development specialist.

•Guardian, which is based in Irvine, California, is one of our PROs responsible for covering portions of the southern California and southwest regions. Guardian managed 58 of our properties located in Arizona, California and Nevada as of December 31, 2023. Guardian is led by John Minar, who has more than 40 years of self storage acquisition, rehabilitation, ownership, operations and development experience.

•Southern, which is based in Palm Beach Gardens, Florida, is one of our PROs responsible for covering portions of Arizona, New Mexico and the southeast region, including New Orleans, the Florida Panhandle, southern Georgia and Puerto Rico. Southern managed 49 of our properties in Arizona, Louisiana, the Florida Panhandle, New Mexico, southern Georgia, and Puerto Rico as of December 31, 2023. Southern is led by Bob McIntosh and Peter Cowie, who are active real estate operators with more than 40 years of self storage experience.

•Blue Sky, which is a strategic partnership between Argus Professional Storage Management and Uplift Development Group (formerly known as GYS Development LLC) and is based in the mountain west, is our PRO responsible for covering portions of the southeast, midwest, and southwest regions, including portions of Kansas, Georgia and Texas. Blue Sky managed 41 of our properties in Alabama, Arkansas, Colorado, Florida, Georgia, Indiana, Kansas, Kentucky, Minnesota, Montana, North Carolina, Texas, Wisconsin and Wyoming as of December 31, 2023. Blue Sky is led by Lee Fredrick, Ben Vestal and Michael Perry, who have extensive experience in acquisition, development and management of self storage properties.

•Moove In, which is based in York, Pennsylvania, is our PRO responsible for covering portions of the mid-atlantic and midwest regions. Moove In managed 38 of our properties in Connecticut, Iowa, Maryland, Massachusetts, New Jersey, New York and Pennsylvania as of December 31, 2023. Moove In is led by John Gilliland, who currently serves on the board of directors for the Large Owners Council of the Self Storage Association, and a past Chairman of the Self Storage Association.

•Hide-Away, which is based in Sarasota, Florida, is our PRO responsible for covering the western Florida market. Hide-Away managed 25 of our properties in western Florida as of December 31, 2023. Hide-Away is led by its founder, Steve Wilson, one of the early developers of the self storage business, who served for more than 40 years as the President of Hide-Away and its related entities, and is a past Chairman of the Self Storage Association.

•Personal Mini, which is based in Orlando, Florida, is our PRO responsible for covering portions of the central Florida market. Personal Mini managed 25 of our properties in central Florida as of December 31, 2023. Personal Mini is led by Marc Smith, a self storage investor who has been involved in all facets of the self storage business. Mr. Smith is a past Chairman of the Self Storage Association, and also previously served as president of the Southeast Region of the Self Storage Association.

•Storage Solutions, which is based in Chandler, Arizona, is our PRO responsible for covering portions of the Arizona and Nevada markets. Storage Solutions managed 11 of our properties in Arizona and Nevada as of December 31, 2023. Storage Solutions is led by its founder, Bill Bohannan, who is one of the largest operators in Phoenix and has more than 40 years of self storage acquisition, development and management experience. Mr. Bohannan is recognized in the industry as a self storage acquisition, development and management specialist.

We benefit from the local market knowledge and active presence of our PROs, allowing us to build and foster important customer and industry relationships. These local relationships provide attractive off-market acquisition opportunities that we believe will continue to fuel additional external growth.

We believe our structure allows our PROs to optimize their established property management platforms while addressing financial and operational hurdles. Before joining us, our PROs faced challenges in securing low cost capital and had to manage multiple investors and lending relationships, making it difficult to compete with larger competitors, including public REITs, for acquisition and investment opportunities. Our PROs were also limited in their ability to raise growth capital through the sale of assets, a portfolio refinancing, or capital contributions from new equity partners. Serving as our on-the-ground acquisition teams, our PROs now have access to our broader financing sources and lower cost of capital, while our national platform allows them to benefit from economies of scale to drive operating efficiencies in a rapidly evolving, technology-driven industry.

We seek to own properties that are well located in high quality sub-markets with highly accessible street access and attractive supply and demand characteristics, providing our properties with strong and stable cash flows that we believe are less sensitive to the fluctuations of the general economy. Many of these markets have multiple barriers to entry against increased supply, including zoning restrictions against new construction and new construction costs that we believe are higher than our properties' fair market value. As of December 31, 2023, we owned a geographically diversified portfolio of 809 self storage properties located in 38 states and Puerto Rico, comprising approximately 51.9 million rentable square feet, configured in approximately 407,000 storage units, which excludes self storage properties classified as held for sale consisting of (i) 39 self storage properties located in eight states, comprising approximately 2.4 million rentable square feet, configured in approximately 18,000 storage units to be sold to a third party in 2024 and (ii) 56 self storage properties located in seven states, comprising approximately 3.2 million rentable square feet, configured in approximately 24,000 storage units that were contributed to the 2024 Joint Venture (as defined in Note 5 to the consolidated financial statements in Item 8) in 2024. Of these properties, 306 were acquired by us from our PROs, 502 were acquired by us from third-party sellers and one was acquired by us from the 2016 Joint Venture (as defined in Note 5 to the consolidated financial statements in Item 8). A complete listing of, and additional information about, our self storage properties is included in Item 2 of this report. 

During the year ended December 31, 2023, we acquired 20 consolidated self storage properties and annexes to existing properties, of which 19 were acquired by us from our PROs and one was acquired by us from a third-party seller. The following is a summary of our 2023 consolidated acquisition activity (dollars in thousands):

During the year ended December 31, 2023, we entered into an agreement to sell, to an unrelated third party, 71 wholly-owned self storage properties consisting of approximately 4.4 million rentable square feet configured in approximately 34,000 storage units for approximately $530.0 million. The agreement provided for separate disposition dates with 32 self storage properties, consisting of approximately 2.0 million rentable square feet configured in approximately 16,000 storage units for approximately $263.2 million, sold during 2023, and 39 self storage properties, consisting of approximately 2.4 million rentable square feet configured in approximately 18,000 storage units for approximately $266.8 million, to be sold during 2024.

During the year ended December 31, 2023, we entered into an agreement to contribute to the 2024 Joint Venture, 56 wholly-owned self storage properties consisting of approximately 3.2 million rentable square feet configured in approximately 24,000 storage units for approximately $346.5 million. These 56 properties were contributed to the 2024 Joint Venture during 2024.

During the year ended December 31, 2022, we acquired 45 consolidated self storage properties, of which five were acquired by us from our PROs and 40 were acquired by us from third-party sellers. The following is a summary of our 2022 consolidated acquisition activity (dollars in thousands):

Subsequent to December 31, 2023, we entered into the 2024 Joint Venture (as defined in Note 5 to the consolidated financial statements in Item 8), in which we have a 25% ownership interest. During 2024, we contributed 56 self storage properties containing approximately 3.2 million rentable square feet, configured in over 24,000 storage units and located across seven states.

As of December 31, 2023, our 2023 Joint Venture (as defined in Note 5 to the consolidated financial statements in Item 8), in which we have a 25% ownership interest, did not own or operate any self storage properties. The 2023 JV Agreement allows for equity capital contributions of up to $400 million from the 2023 JV Members over a 24 month period starting in December 2023, with options to extend the investment time period by two additional six month periods.

As of December 31, 2023, our 2018 Joint Venture (as defined in Note 5 to the consolidated financial statements in Item 8), in which we have a 25% ownership interest, owned and operated 104 self storage properties containing approximately 7.8 million rentable square feet, configured in over 64,000 storage units and located across 17 states.

As of December 31, 2023, our 2016 Joint Venture (as defined in Note 5 to the consolidated financial statements in Item 8), in which we have a 25% ownership interest, owned and operated a portfolio of 81 properties containing approximately 5.7 million rentable square feet, configured in approximately 47,000 storage units and located across 13 states.

We believe our property management platform combined with our unique PRO structure allows us to differentiate ourselves from other self storage operators, and the following competitive strengths enable us to effectively compete against our industry peers:

High Quality Properties in Key Growth Markets.    We held ownership interests in and operated a geographically diversified portfolio of 1,050 self storage properties located in 42 states and Puerto Rico, comprising approximately 68.6 million rentable square feet, configured in approximately 542,000 storage units as of December 31, 2023, excluding 39 self storage properties classified as held for sale to be sold to a third party in 2024. Over 70% of our consolidated portfolio is located in the top 100 MSAs, based on our 2023 net operating income ("NOI"). We believe that these properties are primarily located in high quality growth markets that have attractive supply and demand characteristics and are less sensitive to the fluctuations of the general economy. Many of these markets have multiple barriers to entry against increased supply, including zoning restrictions against new construction and new construction costs that we believe are higher than our properties' fair market value. Furthermore, we believe that our significant size and the overall geographic diversification of our portfolio reduces risks associated with specific local or regional economic downturns or natural disasters.

Integrated Platform Utilizing Advanced Technology for Enhanced Operational Performance and Best Practices.    Our national platform allows us to capture cost savings through integration and centralization, thereby eliminating redundancies and utilizing economies of scale across the property management platforms of us and our PROs. As compared to a stand-alone operator, our national platform has greater access to lower-cost capital, reduced Internet marketing costs per customer lead, discounted property insurance expense, and reduced overhead costs. In addition, the Company has sufficient scale for various centralized functions, including financial reporting, the operation of call centers, expanding cell tower leasing, a national credit card processing program, marketing, information technology, legal support, and capital market functions, to achieve substantial cost savings over smaller, individual operators.

Our national platform utilizes advanced technology for our data warehouse program, Internet marketing, our centralized call centers, financial and property analytic dashboards, revenue optimization analytics and expense management tools to enhance operational performance. These centralized programs, which are run through our Technology and Best Practices Group, are positively impacting our business performance, and we believe that they will continue to be a driver of organic growth going forward. We will continue to utilize our Technology and Best Practices Group to help us benefit from the collective sharing of key operating strategies among our PROs in areas like human resource management, local marketing and operating procedures and building tenant insurance-related arrangements.

Differentiated, Growth-Oriented Strategy Focused on Established Operators.    We are a self storage REIT with a unique PRO structure that supports our differentiated external growth strategy. Our PRO structure appeals to operators who are looking for access to growth capital while maintaining an economic stake in the self storage properties that each manages on our behalf. These attributes entice operators to join the Company rather than sell their properties for cash consideration. Through our PRO structure, we seek to attract operators who are confident in the future performance of their properties and desire to participate in the growth of the Company. We have successfully recruited established operators across the United States with a history of efficient property management and a track record of successful acquisitions. Our structure and differentiated strategy have enabled us to build a substantial captive pipeline of potential acquisition opportunities (our "captive pipeline") from existing operators as well as potentially create external growth from the recruitment of additional PROs.

Aligned Incentive Structure with Shareholder Downside Protection.    Our PRO structure promotes operator accountability as subordinated performance units issued to our PROs in exchange for the contribution of their properties are entitled to distributions only after those properties satisfy minimum performance thresholds. In the event of a material reduction in operating cash flow, distributions on our subordinated performance units will be reduced before or disproportionately to distributions on our common shares held by our common shareholders. In addition, we expect our PROs will generally co-invest subordinated equity in the form of subordinated performance units in each acquisition that they source from a third-party seller, and the value of these subordinated performance units will fluctuate with the performance of their managed portfolios. Therefore, our PROs are incentivized to select acquisitions that are expected to exceed minimum performance thresholds, thereby increasing the value of their subordinated equity stake. We expect that our shareholders will benefit from the higher levels of property performance that our PROs are incentivized to deliver.

By capitalizing on our competitive strengths, we seek to increase scale, achieve optimal revenue-producing occupancy and rent levels, and increase long-term shareholder value by achieving sustainable long-term growth. Our business and growth strategies to achieve these objectives are as follows:

Maximize Property Level Cash Flow.    We strive to maximize the cash flows at our properties by leveraging the economies of scale provided by our national platform, including through the implementation of new ideas derived from our Technology and Best Practices Group. We believe that our efficient national platform, centralized infrastructure and unique PRO structure, will enable us to achieve optimal market rents and occupancy, reduce operating expenses and increase the sale by us and our PROs of ancillary products and services, including tenant insurance, of which we receive a portion of the proceeds, truck rentals and packing supplies.

Acquire Built-in Captive Pipeline of Target Properties from Existing PROs.    We have an attractive, high quality potential acquisition pipeline of over 110 self storage properties valued at approximately $1.7 billion that will continue to drive our future growth. We consider a property to be in our captive pipeline if it (i) is under a management service agreement with one of our PROs, (ii) meets our property quality criteria, and (iii) is either required to be offered to us under the applicable facilities portfolio management agreement or a PRO has a reasonable basis to believe that the controlling owner of the property intends to sell the property in the next seven years.

Our PROs have management service agreements with all of the properties in our captive pipeline and hold controlling and non-controlling ownership interests in some of these properties. With respect to each property in our captive pipeline in which a PRO holds a controlling ownership interest, such PRO has agreed that it will not transfer (or permit the transfer of, to the extent possible) any interest in such self storage property without first offering or causing to be offered (if permissible) such interest to us. In addition, upon maturity of the outstanding mortgage indebtedness encumbering such property, so long as occupancy is consistent with or exceeds average local market levels, which we determine in our sole discretion, such PRO has agreed to offer or cause to be offered (if permissible) such interest to us. With respect to captive pipeline properties in which our PROs have a non-controlling ownership interest or no ownership interest, each PRO has agreed to use commercially reasonable good faith efforts to facilitate our purchase of such property. We preserve the discretion to accept or reject any of the properties that our PROs are required to, or elect to, offer (or cause to be offered) to us.

Access Additional Off-Market Acquisition Opportunities.    Our PROs have established an extensive network of industry relationships and contacts in their respective markets. Through these local connections, our PROs are able to access acquisition opportunities that are not publicly marketed or sold through auctions. Our structure incentivizes our PROs to source acquisitions in their markets from third-party sellers and consolidate these properties into the Company. We believe our PROs' networks, their industry expertise and close familiarity with the other operators in their markets provide us with a clear competitive advantage in identifying and selecting attractive acquisition opportunities, in many cases, before they are publicly marketed. Additionally, we have established a corporate acquisitions team that, through relationships with our PROs and other market participants, sources acquisition opportunities whereby the properties will be managed by our corporate property management team. We believe our reputation as a reliable, well-capitalized buyer, along with our use of OP units as transactional currency which offers a tax-deferred transaction to self storage owners seeking to sell their properties, gives us a competitive advantage over self storage companies that do not have the same transactional history or currency as us.

Recruit Additional New PROs in Target Markets.    We intend to continue to execute on our external growth strategy through additional acquisitions and contributions from future PROs in key markets. We believe there is significant opportunity for growth through consolidation of the highly fragmented composition of the market. We believe that future operators will be attracted to our unique PRO structure, providing them with lower cost of capital, better economies of scale, and greater operational and overhead efficiencies while preserving their existing property management platforms. We intend to add one to three additional PROs to complement our existing geographic footprint and to achieve our goal of creating a highly diversified nationwide portfolio of properties focused in the top 100 MSAs. When considering a PRO candidate, we consider various factors, including the size of the potential PRO's portfolio, the quality and location of its properties, its market exposure, its operating expertise, its ability to grow its business, and its reputation with industry participants.

Strategic Joint Venture Arrangements.    We intend to continue to opportunistically partner with institutional funds and other institutional investors to acquire attractive portfolios utilizing a promoted return structure. We believe there is significant opportunity for continued external growth by partnering with institutional investors seeking to deploy capital in the self storage industry. We intend to leverage our property management platform to provide property and asset management services for future strategic joint ventures, generating additional operating profits and third party fee income. In addition, we consider the 75% third-party interest in our unconsolidated real estate ventures, which as of December 31, 2023 owned 185 properties, to present a potential acquisition opportunity. This 75% third-party share of gross real estate assets is approximately $1.7 billion based on the historical book value of the joint ventures. Were we to pursue an acquisition of these interests, it could potentially drive our future growth. We have entered into agreements for two additional joint ventures and during 2024, we have contributed an additional 56 properties to the 2024 Joint Venture (as defined in Note 5 to the consolidated financial statements in Item 8).

We expect to maintain a flexible approach in financing new property acquisitions. In general, we expect to fund our property acquisitions through a combination of borrowings under bank credit facilities (including term loans and revolving facilities), property-level debt, issuances of OP equity and public and private equity and debt issuances.

As of December 31, 2023, our unsecured credit facility provided for total borrowings of $1.955 billion (the "credit facility"). The credit facility consists of the following components: (i) a revolving line of credit (the "Revolver") which provided for a total borrowing commitment up to $950.0 million, under which we could borrow, repay and re-borrow amounts, (ii) a $275.0 million tranche B term loan facility (the "Term Loan B"), (iii) a $325.0 million tranche C term loan facility (the "Term Loan C"), (iv) a $275.0 million tranche D term loan facility (the "Term Loan D") and (v) a $130.0 million tranche E term loan facility (the "Term Loan E"). As of December 31, 2023, we had the entire amounts drawn on Term Loan B, Term Loan C, Term Loan D and Term Loan E and we had $381.0 million of outstanding borrowings under the Revolver, and the capacity to borrow an additional $562.6 million under the Revolver while remaining in compliance with the credit facility's financial covenants. As of December 31, 2023, we had an expansion option under the credit facility, which, if exercised in full, would have provided for a total credit facility of $2.5 billion.

We have a credit agreement with a lender for a term loan facility that matures in December 2028 (the "2028 Term Loan Facility") and is separate from the credit facility in an aggregate amount of $75.0 million. As of December 31, 2023 the entire amount was outstanding under the 2028 Term Loan Facility with an effective interest rate of 4.62%. We have an expansion option under the 2028 Term Loan Facility, which, if exercised in full, would provide for total borrowings in an aggregate amount up to $125.0 million.

We have a credit agreement with a lender for a term loan facility that matures in April 2029 (the "April 2029 Term Loan Facility") and is separate from the credit facility and 2028 Term Loan Facility in an aggregate amount of $100.0 million. As of December 31, 2023 the entire amount was outstanding under the April 2029 Term Loan Facility with an effective interest rate of 4.27%.

We have a June 2029 Term Loan Facility that matures in June 2029 (the "June 2029 Term Loan Facility") and is separate from the credit facility, 2028 Term Loan Facility, and April 2029 Term Loan Facility in an aggregate amount of $285.0 million. As of December 31, 2023, the June 2029 Term Loan Facility had an effective interest rate of 5.37%. We have an expansion option under the June 2029 Term Loan Facility, which, if exercised in full, would provide for total borrowings in an aggregate amount up to $300.0 million.

The credit facility, 2028 Term Loan Facility, April 2029 Term Loan Facility and the June 2029 Term Loan Facility each contain the same financial covenants and customary affirmative and negative covenants that, among other things, could limit the Company's ability to make distributions or certain investments, incur debt, incur liens and enter into certain transactions.

On August 30, 2019, our operating partnership issued $100.0 million of 3.98% senior unsecured notes due August 30, 2029 (the "2029 Notes") and $50.0 million of 4.08% senior unsecured notes due August 30, 2031 (the "August 2031 Notes") in a private placement to certain institutional investors.

On October 22, 2020, our operating partnership issued $150.0 million of 2.99% senior unsecured notes due August 5, 2030 (the "August 2030 Notes") and $100.0 million of 3.09% senior unsecured notes due August 5, 2032 (the "August 2032 Notes").

On May 26, 2021, our operating partnership issued $55.0 million of 3.10% senior unsecured notes due May 4, 2033 (the "May 2033 Notes").

On July 26, 2021, our operating partnership issued $35.0 million of 2.16% senior unsecured notes due May 4, 2026 (the "May 2026 Notes") and $90.0 million of 3.00% senior unsecured notes due May 4, 2031 (the "May 2031 Notes").

On December 14, 2021, our operating partnership issued $75.0 million of 2.72% senior unsecured notes due November 30, 2030 (the "November 2030 Notes"), $175.0 million of 2.81% senior unsecured notes due November 30, 2031 (the "November 2031 Notes") and $75.0 million of 3.06% senior unsecured notes due November 30, 2036 (the "2036 Notes").

On January 28, 2022, our operating partnership issued $125.0 million of 2.96% senior unsecured notes due November 30, 2033 (the "November 2033 Notes").

On September 28, 2022, our operating partnership issued $200.0 million of 5.06% senior unsecured notes due November 16, 2032 (the "November 2032 Notes").

On April 27, 2023, our operating partnership issued $120.0 million of 5.61% senior unsecured notes due July 5, 2028 (the "July 2028 Notes"). As of December 31, 2023, the July 2028 Notes had an effective interest rate of 5.75%.

On October 5, 2023, our operating partnership issued $65.0 million of 6.46% senior unsecured notes due October 5, 2026 (the "October 2026 Notes"), $100.0 million of 6.55% senior unsecured notes due October 5, 2028 (the "October 2028 Notes"), $35.0 million of 6.66% senior unsecured notes due October 5, 2030 (the "October 2030 Notes") and $50.0 million of 6.73% senior unsecured notes due October 5, 2033 (the "October 2033 Notes" and together with the May 2026 Notes, October 2026 Notes, July 2028 Notes, October 2028 Notes, 2029 Notes, August 2030 Notes, October 2030 Notes, November 2030 Notes, May 2031 Notes, August 2031 Notes, November 2031 Notes, August 2032 Notes, November 2032 Notes, May 2033 Notes, November 2033 Notes and 2036 Notes, the "Senior Unsecured Notes") in a private placement to certain institutional investors.

The Senior Unsecured Notes are subject to customary affirmative and negative covenants that, among other things, limit the Company's ability to make distributions or certain investments, incur debt, incur liens and enter into certain transactions.

We expect to employ leverage in our capital structure in amounts determined from time to time by our board of trustees. Although our board of trustees has not adopted a policy which limits the total amount of indebtedness that we may incur, it will consider a number of factors in evaluating our level of indebtedness from time to time, as well as the amount of such indebtedness that will be either fixed and variable-rate, and in making financial decisions, including, among others, the following:

•the interest rate of the proposed financing;

•the extent to which the financing impacts our flexibility in managing our properties;

•prepayment penalties and restrictions on refinancing;

•the purchase price of properties we acquire with debt financing;

•our long-term objectives with respect to the financing;

•our target investment returns;

•the ability of particular properties, and the Company as a whole, to generate cash flow sufficient to cover expected debt service payments;

•overall level of consolidated indebtedness;

•timing of debt maturities;

•provisions that require recourse and cross-collateralization;

•corporate credit ratios including debt service coverage, debt to total market capitalization and debt to undepreciated assets; and

•the overall ratio of fixed- and variable-rate debt.

Our indebtedness may be recourse, non-recourse or cross-collateralized. If the indebtedness is non-recourse, the collateral will be limited to the particular properties to which the indebtedness relates. In addition, we may invest in properties subject to existing loans secured by mortgages or similar liens on our properties, or may refinance properties acquired on a leveraged basis. We may use the proceeds from any borrowings to refinance existing indebtedness, to refinance investments, including the redevelopment of existing properties, for general working capital or for other purposes when we believe it is advisable.

In the future, we may adopt a dividend reinvestment plan that will permit shareholders who elect to participate in the plan to have their cash dividends reinvested in additional common shares.

Generally, self storage properties are subject to various laws, ordinances and regulations, including those relating to lien sale rights and procedures, public accommodations, insurance, and the environment. Changes in any of these laws, ordinances or regulations could increase the potential liability existing or created by tenants or others on our properties. Laws, ordinances, or regulations affecting development, construction, operation, upkeep, safety and taxation requirements may result in significant unanticipated expenditures, loss of self storage sites or other impairments to operations, which would adversely affect our cash flows from operating activities.

Under the Americans with Disabilities Act of 1990 (the "ADA"), all places of public accommodation are required to meet certain federal requirements related to access and use by disabled persons. A number of additional U.S. federal, state and local laws may also require modifications to our properties, or restrict certain further renovations of the properties, with respect to access thereto by disabled persons. The ADA or these other laws may also apply to our websites. For additional information on the ADA, see "Item 1A. Risk Factors—Risks Related to Our Business—Costs associated with complying with the ADA may result in unanticipated expenses."

Insurance activities are subject to state insurance laws and regulations as determined by the particular insurance commissioner for each state in accordance with the McCarran-Ferguson Act, as well as subject to the Gramm-Leach-Bliley Act and the privacy regulations promulgated by the Federal Trade Commission pursuant thereto.

Under various U.S. federal, state and local laws, ordinances and regulations, owners and operators of real estate may be liable for the costs of investigating and remediating certain hazardous substances or other regulated materials on or in such property. The Comprehensive Environmental Response Compensation and Liability Act of 1980, as amended ("CERCLA") and comparable state laws typically impose strict joint and several liabilities without regard to whether the owner or operator knew of, or was responsible for, the presence of such substances or materials. The presence of such substances or materials, or the failure to properly remediate such substances, may adversely affect the owner's or operator's ability to lease, sell or rent such property or to borrow using such property as collateral. Persons who arrange for the disposal or treatment of hazardous substances or other regulated materials may be liable for the costs of removal or remediation of such substances at a disposal or treatment facility, whether or not such facility is owned or operated by such person. Certain environmental laws impose liability for release of asbestos-containing materials into the air and third-parties may seek recovery from owners or operators of real properties for personal injury associated with asbestos-containing materials. Certain environmental laws also impose liability, without regard to knowledge or fault, for removal or remediation of hazardous substances or other regulated materials upon owners and operators of contaminated property. Moreover, the past or present owner or operator of a property from which a release emanates could be liable for any personal injuries or property damages that may result from such releases, as well as any damages to natural resources that may arise from such releases. Certain environmental laws impose compliance obligations on owners and operators of real property with respect to the management of hazardous materials and other regulated substances. For example, environmental laws govern the management of asbestos-containing materials and lead-based paint. Failure to comply with these laws can result in penalties or other sanctions. In connection with the ownership, operation and management of our current or past properties and any properties that we may acquire and/or manage in the future, we could be legally responsible for environmental liabilities or costs relating to a release of hazardous substances or other regulated materials at or emanating from such property. In order to assess the potential for such liability, we conduct an environmental assessment of each property prior to acquisition and manage our properties in accordance with environmental laws while we own or operate them. We have engaged qualified, reputable and adequately insured environmental consulting firms to perform environmental site assessments of all of our properties prior to acquisition and are not aware of any environmental issues that are expected to materially impact the operations of any property. For additional information on environmental matters and regulation, see "Item 1A. Risk Factors—Risks Related to Our Business—Environmental compliance costs and liabilities associated with operating our properties may affect our results of operations."

Property management activities are often subject to state real estate brokerage laws and regulations as determined by the particular real estate commission for each state. We may be required to comply with various state privacy statutes in connection with the operation of our business. In addition, we may be required to comply with federal, state and local laws, rules and regulations in connection with our communications with our tenants or prospective tenants, including with respect to available units, reservations, payments due, and other matters.

We have elected and we believe that we have qualified to be taxed as a REIT under the Internal Revenue Code of 1986, as amended, (the "Code"), commencing with our taxable year ended on December 31, 2015. We generally will not be subject to U.S. federal income tax on our net taxable income to the extent that we distribute annually all of our net taxable income to our shareholders and maintain our qualification as a REIT. We believe that we have been organized and have operated in conformity with the requirements for qualification and taxation as a REIT under the Code, and we expect that our intended manner of operation will enable us to continue to meet the requirements for qualification and taxation as a REIT. To qualify, and maintain our qualification, as a REIT, we must meet on a continuing basis, through our organization and actual investment and operating results, various requirements under the Code relating to, among other things, the sources of our gross income, the composition and values of our assets, our distribution levels and the diversity of ownership of our shares. If we fail to qualify as a REIT in any taxable year and do not qualify for certain statutory relief provisions, we will be subject to U.S. federal income tax at regular corporate rates and may be precluded from qualifying as a REIT for the subsequent four taxable years following the year during which we failed to qualify as a REIT. Even if we qualify for taxation as a REIT, we still may be subject to some U.S. federal, state and local taxes on our income or assets. In addition, subject to maintaining our qualification as a REIT, a portion of our business is conducted through, and a portion of our income is earned by, one or more taxable REIT subsidiaries ("TRSs"), which are subject to U.S. federal corporate income tax at regular rates. Distributions paid by us generally will not be eligible for taxation at the preferential U.S. federal income tax rates that currently apply to certain distributions received by individuals from taxable corporations, unless such distributions are attributable to dividends received by us from a TRS.

We compete with many other entities engaged in real estate investment activities for customers and acquisitions of self storage properties and other assets, including national, regional, and local owners, operators, and developers of self storage properties. We compete based on a number of factors including location, rental rates, security, suitability of the property's design to prospective tenants' needs, and the manner in which the property is operated and marketed. We believe that the primary competition for potential customers comes from other self storage properties within a three to five mile radius. We have positioned our properties within their respective markets as high-quality operations that emphasize tenant convenience, security, and professionalism.

We also may compete with numerous other potential buyers when pursuing a possible property for acquisition, which can increase the potential cost of a project. These competing bidders also may possess greater resources, or have a lower cost of capital, than us and therefore be in a better position to acquire a property. However, our use of OP units and subordinated performance units as transactional currency allows us to structure our acquisitions in tax-deferred transactions. As a result, potential targets who are tax-sensitive might favor us as a suitor.

Our primary national competitors in many of our markets for both tenants and acquisition opportunities include local and regional operators, institutional investors, private equity funds, as well as the other public self storage REITs, including Public Storage, CubeSmart, and Extra Space Storage Inc. These entities also seek financing through similar channels to the Company. Therefore, we will continue to compete for institutional investors in a market where funds for real estate investment may decrease.

We seek to foster a diverse and inclusive work environment that values each individual team member’s talents and contributions, while channeling those efforts toward our common core values of integrity, accountability, humility and compassion. Our success relies on the general professionalism of our employees and our PRO's site managers and staff which are contributing factors to a site's ability to successfully secure rentals, retain tenants and maintain clean and secure self storage properties. We seek to increase employee retention and well-being and our team members enjoy a robust benefit package that includes medical, dental, vision, life insurance, 401K with matching employer contribution and a performance-based bonus incentive plan. We also seek to promote diversity among our employees and management team. As of December 31, 2023, approximately 63% of our employees were women and 32% of our senior management team (Director level and above) were women, including Tamara Fischer, our Executive Chairperson of our Board of Trustees.

As of December 31, 2023, we had 1,108 employees, which includes employees of our property management platform but does not include persons employed by our PROs. As of December 31, 2023, our PROs, collectively, had approximately 600 full-time and part-time employees involved in management, operations, and reporting with respect to our self storage property portfolio.

We file registration statements, proxy statements, our Annual Report on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K, and all amendments to those statements and reports with the Securities and Exchange Commission (the "SEC"). Investors may obtain copies of these statements and reports by accessing the SEC's website at www.sec.gov. Our statements and reports and any amendments to any of those statements and reports that we file with the Securities and Exchange Commission are available free of charge as soon as reasonably practicable on our website at www.nationalstorageaffiliates.com. The information contained on our website is not incorporated into this Annual Report on Form 10-K. Our common shares are listed on the New York Stock Exchange under the symbol "NSA."

Our operating results are dependent upon our ability to achieve optimal occupancy levels and rental rates at our self storage properties. Adverse economic or other conditions in the markets in which we do business, particularly in our markets in Texas, California, Florida, Georgia, and Oregon, which accounted for approximately 17%, 12%, 11%, 6%, and 6%, respectively, of our total rental and other property-related revenues for the year ended December 31, 2023, may lower our occupancy levels and limit our ability to maintain or increase rents or require us to offer rental discounts. No single customer represented a significant concentration of our 2023 revenues. However, our property portfolio consists solely of self storage properties and is therefore subject to risks inherent in investments in a single industry. The following adverse developments, among others, in the markets in which we do business may adversely affect the operating performance of our properties or our financial results:

•business layoffs or downsizing, industry slowdowns, relocation of businesses and changing demographics;

•periods of economic slowdown, recession, high interest rates, or inflationary environments, declining demand for self storage generally or in a particular area or the public perception that any of these events may occur;

•local or regional real estate market conditions, such as competing properties or products, the oversupply of self storage, or vacancies or changes in self storage space market rents;

•perceptions by prospective tenants of the safety, convenience and attractiveness of our properties and the neighborhoods in which they are located; and

•other events affecting or shifting consumer discretionary spending.

Any of the above events may reduce our rental revenues, impair our operating results, and reduce our ability to satisfy our debt service obligations and make cash distributions to our shareholders, and the effect of the foregoing may be greater than it would be were our investments not limited to a single industry.

Our ability to expand through acquisitions is integral to our business strategy and requires us to identify suitable acquisition candidates or investment opportunities that meet our criteria and are compatible with our growth strategy. We may not be successful in identifying suitable properties or other assets that meet our acquisition criteria or in consummating acquisitions on satisfactory terms or at all. Failure to identify or consummate acquisitions will slow our growth, which could in turn adversely affect our share price.

For the potential acquisitions in our captive pipeline, we have not entered into negotiations with the respective owners of these properties and there can be no assurance as to whether we will acquire any of these properties or the actual timing of any such acquisitions. Each captive pipeline property is subject to additional due diligence and the determination by us to pursue the acquisition of the property. In addition, with respect to the captive pipeline properties in which our PROs have a non-controlling ownership interest or no ownership interest, the current owner of each property is not required to offer such property to us and there can be no assurance that we will acquire these properties.

Our ability to acquire properties on favorable terms and successfully integrate and operate them, including integrating them into our financial and operational reporting infrastructure in a timely manner, may be constrained by the following significant risks:

•we face competition from national, regional and local owners, operators and developers of self storage properties, which may result in higher property acquisition prices and reduced yields;

•we may not be able to achieve satisfactory completion of due diligence investigations and other customary closing conditions;

•we may fail to finance an acquisition on favorable terms or at all;

•we may spend more time and incur more costs than budgeted to make necessary improvements or renovations to, and to integrate and operate, acquired properties; and

•we may acquire properties subject to liabilities without any recourse, or with only limited recourse, with respect to unknown liabilities such as liabilities for clean-up of undisclosed environmental contamination, tax liabilities, claims by persons dealing with the former owners of the properties and claims for indemnification by general partners, trustees, officers and others indemnified by the former owners of the properties.

The contributors of properties may make limited representations and warranties to us about the properties and may agree to indemnify us up to a specified amount for a certain period of time following the closing for breaches of those representations and warranties. However, any resulting liabilities identified may not fall within the scope or time frame covered by the indemnification, and we may be required to bear those liabilities, which may materially and adversely affect our operating results, financial condition and business.

We compete with many other entities engaged in real estate investment activities for tenants, including national, regional and local owners, operators and developers of self storage properties. Actions by our competitors may decrease or prevent increases in the occupancy and rental rates, while increasing the operating expenses, of our properties.

Increases in income or other taxes generally are not passed through to tenants under leases and may reduce or negatively impact our net income, funds from operations ("FFO"), core FFO, cash flows, financial condition, ability to pay or refinance our debt obligations, ability to make cash distributions to shareholders, and the trading price of our securities. In addition, the value of our properties may be reassessed for property tax purposes by taxing authorities including as a result of our acquisition activities. For example, our property taxes could increase due to changes in tax rates or removal of limitations on the amount by which our property taxes or property reassessments may increase. From time to time, proposals have been made to remove certain limits on annual real estate tax increases of assessed value of real property in California, where we currently have 87 consolidated properties and 12 unconsolidated properties. While no such initiative has yet been successful, to the extent a similar future initiative is successful, our property tax expense could increase substantially, which could adversely impact our operating results, cash flow, and our ability to pay any expected dividends to our shareholders.

Similarly, in response to facing severe budgetary problems, many states and jurisdictions are considering or implementing changes in laws such as increasing sales taxes, increasing the potential liability for environmental conditions existing on properties, increasing the restrictions on discharges or other conditions, or mandating paid family leave for employees, which may result in significant unanticipated expenditures, which could result in similar adverse effects.

Our storage leases are relatively short-term in nature, typically month-to-month, which exposes us to the risk that we may have to re-lease our units frequently and we may be unable to do so on attractive terms, on a timely basis or at all. Because these leases generally permit the tenant to leave at the end of the month without penalty, our revenues and operating results may be impacted by declines in market rental rates more quickly than if our leases were for longer terms. In addition, any delay in re-leasing units as vacancies arise would reduce our revenues and harm our operating results.

We and our PROs are increasingly dependent upon automated information technology processes and Internet commerce, and many of our and their tenants come from the telephone or over the Internet. Moreover, the nature of our and our PROs' business involves the receipt and retention of certain personal information about such tenants. In many cases, we and our PROs also rely significantly on third-party vendors to retain data, process transactions and provide other systems services. Our networks and operations could be disrupted, and sensitive data could be compromised, by physical or electronic security breaches, targeted against us, our PROs, our vendors or other organizations, including financial markets or institutions, including by way of or through cyber-attacks or cyber-intrusions over the Internet, malware, computer viruses, attachments to e-mails, phishing, employee theft or misuse, or inadequate security controls. Although we make efforts to protect the security and integrity of our networks and systems, there can be no assurance that these efforts and measures will be effective or that attempted security breaches or disruptions would not be successful, as such attacks and breaches may be difficult to detect (or not detected at all) and are becoming more sophisticated. In such event, we may experience business interruptions; data loss, ransom, misappropriation, or corruption; theft or misuse of confidential or proprietary information; or litigation and investigation by tenants, governmental or regulatory agencies, or other third parties, which could result in the payment of fines, penalties and other damages. Such events could also have other adverse impacts on us, including breaches of debt covenants, other contractual or REIT compliance obligations, or late or misstated financial reports, and significant diversion of management attention and resources. As a result, such events could have a material adverse effect on our financial condition, results of operations and cash flows and harm our business reputation or have such effects on our PROs.

Under the ADA and other federal, state and local laws, we are required to meet certain requirements related to access and use by disabled persons. Noncompliance with the ADA could result in the imposition of fines or an award of damages to private litigants and also could result in an order to correct any non-complying feature, which could result in substantial capital expenditures. If one or more of our properties or websites is not in compliance with the ADA or similar laws, then we would be required to incur additional costs to bring the property or websites into compliance. If we incur such costs and they are substantial, our financial condition, results of operations, cash flow, per share trading price of our common shares and our ability to satisfy our debt service obligations and to make cash distributions to our shareholders could be adversely affected.

Under various U.S. federal, state and local environmental laws, ordinances and regulations, owners and operators of real estate may be liable for the costs of investigating and remediating certain hazardous substances or other regulated materials on or in such property. No assurances can be given that existing environmental studies with respect to any of our properties reveal all environmental liabilities, that any prior owner or operator of our properties did not create any material environmental condition not known to us, or that a material environmental condition does not otherwise exist as to any one or more of our properties. There also exists the risk that material environmental conditions, liabilities or compliance concerns may have arisen after the review was completed or may arise in the future. Finally, future laws, ordinances or regulations and future interpretations of existing laws, ordinances or regulations may impose additional material environmental liability.

We and certain of our PROs have tenant insurance- and/or tenant protection plan-related arrangements with regulated insurance companies and our tenants. Some of our PROs earn access fees in connection with these arrangements. We receive a portion of the fees from these PROs. The tenant insurance and tenant protection plan businesses, including the payments associated with these arrangements, are in some cases subject to state-specific governmental regulation. State regulatory authorities generally have broad discretion to grant, renew and revoke licenses and approvals, to promulgate, interpret and implement regulations, and to evaluate compliance with regulations through periodic examinations, audits and investigations of the affairs of insurance industry participants. As a result of such action, we may be temporarily or permanently suspended from continuing some or all of our tenant insurance- and/or tenant protection plan-related activities, or otherwise fined or penalized or suffer an adverse judgment, which could adversely affect our business and results of operations.

Personal privacy has become a significant issue in the jurisdictions in which we operate. Many jurisdictions in which we operate have imposed or in the future may impose restrictions and requirements on the use of personal information by those collecting such information. For example, the California Consumer Privacy Act of 2018, which became effective as of January 1, 2020, together with the California Privacy Rights Act, provides consumers with expansive rights and control over personal information obtained by or shared with certain covered businesses. Changes to law or regulations or the passage of new laws affecting privacy, if applicable to our business, could impose additional costs and liability on us and could limit our use and disclosure of such information.

We cannot predict the rate at which climate change will progress. However, the physical effects of climate change could have a material adverse effect on our properties, operations, and business. To the extent that climate change impacts changes in weather patterns, our markets could experience severe weather, including hurricanes, tornados, earthquakes, severe winter storms, wildfires and coastal flooding due to increases in storm intensity and rising sea levels. Over time, these conditions could result in declining demand for storage at our properties or in our inability to operate them at all. Climate change and severe weather may also have indirect effects on our business by increasing the cost of, or decreasing the availability of, property insurance, utilities or other important vendor services on terms we find acceptable, by increasing the costs of energy, maintenance, repair of fire, water and/or wind damage, and snow removal at our properties. There can be no assurance that climate change and severe weather, or the potential impacts of these events on our vendors, will not have a material adverse effect on our properties, operations, or business

Changes in federal, state, and local legislation and regulation as well as international pacts or treaties based on concerns about climate change could result in increased capital expenditures on our existing properties (for example, to improve their energy efficiency and/or resistance to severe weather) without a corresponding increase in revenue, which may result in adverse impacts to our net income. In recent years, there have been a number of new legal efforts to reduce greenhouse gas emissions and to take other similar actions to combat the effects of climate change, including at the international level and at the U.S. federal, state and local levels.

We maintain comprehensive liability, fire, flood, earthquake, wind (as deemed necessary or as required by our lenders), extended coverage and rental loss insurance with respect to our properties. Certain types of losses, however, may be either uninsurable or not economically insurable either in total or in part (due to location or otherwise), such as losses due to earthquakes, hurricanes, tornadoes, floods, riots, acts of war or terrorism. Should an uninsured loss occur, we could lose both our investment in and anticipated profits and cash flow from a property or otherwise be subject to significant liabilities. In addition, if any such loss is insured, we may be required to pay significant amounts on any claim for recovery of such a loss prior to our insurer being obligated to reimburse us for the loss, or the amount of the loss may exceed our coverage for the loss. We currently self-insure a portion of our commercial insurance deductible risk through our captive insurance company. To the extent that our captive insurance company is unable to bear that risk, we may be required to fund additional capital to our captive insurance company or we may be required to bear that loss. As a result, our operating results may be adversely affected.

Because real estate investments are relatively illiquid and we have agreed and may in the future agree to certain transfer restrictions with respect to our properties, our ability to promptly sell one or more properties in our portfolio in response to changing economic, financial and investment conditions is limited. The real estate market is affected by many factors, such as general economic conditions, availability of financing, interest rates, supply and demand, and others, that are beyond our control. We cannot predict whether we will be able to sell any property for the price or on the terms set by us or whether any price or other terms offered by a prospective purchaser would be acceptable to us. We also cannot predict the length of time needed to find a willing purchaser and to close the sale of a property. In addition, we may be required to expend funds to correct defects or to make improvements before a property can be sold. We cannot assure you that we will have funds available to correct those defects or to make those improvements.

Our success depends, to a significant extent, on the continued services of Arlen D. Nordhagen, Tamara D. Fischer, David G. Cramer, Brandon S. Togashi, William S. Cowan, Derek Bergeon and Tiffany S. Kenyon and the other members of our senior management team. We have entered into employment agreements with Mr. Nordhagen, Ms. Fischer, Mr. Cramer, Mr. Togashi, Mr. Cowan, Mr. Bergeon and Ms. Kenyon, which provide for an initial term of employment and automatic one-year extensions thereafter unless either party provides at least 90 days' notice of non-renewal. Notwithstanding these agreements, there can be no assurance that any of them will remain employed by us. The loss of services of one or more members of our senior management team could harm our business and our prospects. This risk may be heightened during periods of tight labor market conditions.

Some of our investments are, and in the future may be, structured as strategic joint ventures. Part of our strategy is to opportunistically partner with institutional funds and other institutional investors to acquire attractive portfolios through a promoted return structure. These arrangements are driven by the magnitude of capital required to complete the acquisitions and maintain the acquired portfolios. Such arrangements involve risks not present where a third party is not involved, including the possibility that partners or co-venturers might become bankrupt or otherwise fail to fund their share of required capital contributions. Additionally, partners or co-venturers might at any time have economic or other business interests or goals different from us and or in competition with us.

Joint ventures generally provide for a reduced level of control over an acquired project because governance rights are shared with others. Accordingly, certain major decisions relating to joint ventures, including decisions relating to, among other things, the approval of annual budgets, sales and acquisitions of properties, financings, and certain actions relating to bankruptcy, are often made by a majority vote of the investors or by separate agreements. In addition, such decisions may be subject to the risk that the partners or co-venturers may make certain decisions with which we do not agree or otherwise act in a manner that does not serve our best interests. Because we may not have the ability to exercise control over such operations, we may not be able to realize some or all of the benefits that we believe will be created from our involvement. At times, we and our partners or co-venturers may also each have the right to trigger a buy-sell arrangement, which could cause us to sell our interest, or acquire our partners' or co-venturers' interest, at a time when we otherwise would not have initiated such a transaction. If any of the foregoing were to occur, our business, financial condition and results of operations could suffer as a result.

We face various risks related to public health and other crises, such as the future outbreak of a highly infectious or contagious disease. The impact of such crises and the response of governments to combat the spread of these diseases, could, among other things, affect our tenants ability to meet their obligations to us, impact consumer discretionary spending, reduce new move-ins, compel complete or partial closures and operational changes at our properties, reduce demand for growth opportunities, such as acquiring new properties or adding new PROs, and interrupt the availability of our and our PROs' personnel. As a result, such crises could adversely impact our financial condition, results of operations and cash flows.

Terrorist attacks at or against our stores, our interests, the United States or abroad, may negatively impact our operations and the value of our securities. Attacks, armed conflicts or active-shooter situations could negatively impact the demand for self-storage and increase of insurance coverage for our stores, which could reduce our profitability and cash flow. Furthermore, any terrorist attacks, armed conflicts or active-shooter situations could result in increased volatility in or damage to the United States and worldwide financial markets and economy.

As a means of incentivizing our PROs to drive operating performance and support the sustainability of the operating cash flow from the properties they manage on our behalf, we issued each PRO subordinated performance units aimed at aligning the interests of our PROs with our interests and those of our shareholders. The subordinated performance units are entitled to distributions exclusively tied to the performance of each PRO's managed portfolios but only after minimum performance thresholds are satisfied. Our issuance of such units, however, may have been and could be based on inaccurate valuations and thus misallocated, which would limit or eliminate the effectiveness of our intended incentive-based program.

We may elect to terminate our FPMAs and AMAs with a PRO and transfer property management responsibilities over the properties managed by such PRO to us (or our designee), (i) upon certain defaults by a PRO as set forth in these agreements, or (ii) if the PRO's properties, on a portfolio basis, fail to meet certain predetermined performance thresholds for more than two consecutive calendar years or if the operating cash flow generated by the properties of the PRO for any calendar year falls below a level that will enable us to fund minimum levels of distributions, debt service payments attributable to the properties, and fund the properties' allocable operating expenses. Consequently, to the extent a PRO complies with these covenants, standards, and minimum requirements, we may not be able to terminate the applicable FPMAs and AMAs and transfer property management responsibilities over such properties to us (or our designee) even if our board believes that such PRO is not properly executing our business plan and/or is failing to operate its properties to their full potential. Moreover, transferring the management responsibilities over the properties managed by a PRO may be costly or difficult to implement or may be delayed, even if we are able to and believe that such a change in portfolio and property management would be beneficial to us and our shareholders.

Our PROs are entities that have contributed self storage properties to us in exchange for ownership interests in us. As part of each transaction, our PROs make limited representations to us regarding the entities, properties and other assets to be acquired by us in the contribution and generally agree to indemnify us for 12 months after the closing of the contribution for breaches of such representations. Such indemnification is limited, however, and we are not entitled to any other indemnification in connection with the contributions. In addition, following each contribution from a PRO, the day-to-day operations of each of the managed properties will be managed by the PRO who was the principal of the applicable property portfolios prior to the contribution. In addition, certain key persons of our PROs are members of our board or our PRO advisory committee. Consequently, we may choose not to enforce, or to enforce less vigorously, our rights under these agreements and any other agreements with our PROs due to our desire to maintain our ongoing relationship with our PROs, which could adversely affect our operating results and business.

Pursuant to our FPMAs, each PRO has agreed that, without our consent, the PRO will not, and it will cause its affiliates (other than Blue Sky's sub-manager) not to, enter into any new arrangements for the management of additional self storage properties within any PRO's assigned territory. However, we have not and will not acquire all of the self storage properties of our PROs. We will therefore own self storage properties in some of the same geographic regions as our PROs, and, as a result, we and our PROs may compete for tenants. This competition may affect our ability to attract and retain tenants and may reduce the rental rates we are able to charge, which could adversely affect our operating results and business.

Our PROs and their employees and personnel are in the business of managing self storage properties. We have agreed that our PROs may continue to manage properties not included in our portfolio, and our PROs are not obligated to dedicate any specific employees or personnel exclusively to the management of our properties. As a result, their time and efforts may be diverted from the management of our properties, which could adversely affect the execution of our business plan and our operating results.

Under our FPMAs, after a two-year period following the initial contribution of their properties to us, a PRO may elect, or be required, to "retire" from the self storage business. Upon a retirement event, management of the properties will be transferred to us (or our designee) in exchange for OP units with a value equal to four times the average of the normalized annual EBITDA from the management contracts related to such PRO's managed portfolio over the immediately preceding 24-month period. As a result of this transfer, we may become exposed to new and additional costs and risks. Accordingly, the retirement of a PRO may adversely affect our financial condition and operating results. For example, in connection with our internalization of a retiring PRO, there can be no assurance that we will be able to retain such retiring PRO's employees, successfully hire new employees, or effectively integrate such employees and the retiring PRO's property management platform into our or another PRO's property management platform.

Conflicts of interest could arise with respect to the interests of holders of OP units and subordinated performance units, on the one hand, which include members of our senior management team, PROs, and trustees and us and our shareholders, on the other. Certain business combinations, the sale, disposition or transfer of certain of our assets or the repayment of certain indebtedness that may be desirable to us and our shareholders could have adverse tax consequences to such unit holders. In addition, under Maryland law, our trustees and officers have duties to the Company in connection with their management of the Company, however, under Delaware law, as a general partner, we have fiduciary duties to our operating partnership and to the limited partners in connection with the management of our operating partnership. Our duties as a general partner may come into conflict with the duties of our trustees and officers to the Company and our shareholders and we are not required to resolve such conflicts in favor of either the Company or the limited partners in our operating partnership. Further, there can be no assurance that any procedural protections we implement to address these or other conflicts of interest will result in optimal outcomes for us and our shareholders.

The partnership agreement of our operating partnership provides that subordinated performance unit holders holding more than 50% of the voting power of the subordinated performance units must approve certain change of control transactions involving us unless, as a result of such transactions, the holders of subordinated performance units are offered a choice (1) to allow their subordinated performance units to remain outstanding without the terms thereof being materially and adversely changed or the subordinated performance units are converted into or exchanged for equity securities of the surviving entity having terms and conditions that are substantially similar to those of the subordinated performance units (it being understood that we may not be the surviving entity and that the parent of the surviving entity or the surviving entity may not be publicly traded) or (2) to receive for each subordinated performance unit an amount of cash, securities or other property payable to a holder of OP units had such holder exercised its right to exchange its subordinated performance units for OP units without taking into consideration a specified conversion penalty associated with such an exchange. In addition, in the case of any such change of control transactions in which we have not received the consent of OP unit holders holding more than 50% of the OP units (other than those held by us or our subsidiaries) and of subordinated performance unit holders holding more than 50% of the voting power of the subordinated performance units (other than those held by us or our subsidiaries), such transaction is required to be approved by a company-wide vote of limited partners holding more than 50% of our outstanding OP units in which OP units (including for this purpose OP units held by us and our subsidiaries) are voted and subordinated performance units (not held by us and our subsidiaries) are voted on an applicable as converted basis and in which we will be deemed to vote the OP units held by us and our subsidiaries in proportion to the manner in which all of our outstanding common shares were voted at a shareholders meeting relating to such transaction. These approval rights could delay, deter, or prevent a transaction or a change in control that might involve a premium price for our common shares or otherwise be in the best interests of our shareholders.

The MGCL, our bylaws and our declaration of trust contain provisions that may discourage, delay or make more difficult a change in our control. We are subject to the Maryland Business Combination Act (the "MBCA"). Our board has adopted a resolution exempting from the MBCA any business combinations between us and (1) any other person, provided that the business combination is first approved by our board (including a majority of disinterested trustees), (2) Arlen D. Nordhagen and any of his affiliates and associates and (3) any person acting in concert with the foregoing. As a result, such persons may be able to enter into business combinations with us that may not be in the best interests of our shareholders without compliance by us with the moratorium supermajority vote requirements and other provisions of the statute. If this resolution is repealed or our board does not approve a business combination, the MBCA may discourage third parties from trying to acquire control of us and increase the difficulty of consummating such an offer.

The Maryland Control Share Acquisition Act (the "MCSAA") provides that holders of "control shares" of a Maryland real estate investment trust acquired in a "control share acquisition" have no voting rights with respect to such shares except to the extent approved by our shareholders by the affirmative vote of at least two-thirds of all the votes entitled to be cast on the matter, excluding votes entitled to be cast by the acquirer of control shares, our officers and our trustees who are also our employees. Our bylaws exempt from the MCSAA acquisitions of our shares by any person. If we amend our bylaws to repeal the exemption from MCSAA, the MCSAA also may make it more difficult for a third party to obtain control of us and increase the difficulty of consummating such an offer.

We have also adopted other measures that may make it difficult for a third party to obtain control of us, including provisions of our declaration of trust and bylaws limiting the liability of our present and former trustees and officers to us and our shareholders for money damages to the maximum extent permitted under Maryland law, requiring us to indemnify our present and former trustees and officers for actions taken in their official capacities, permitting (subject to the rights of holders of any class or series of preferred shares) removal of a trustee, with or without cause, only by the affirmative vote of at least two-thirds of the votes entitled to be cast generally in the election of trustees, and authorizing our board (without shareholder approval) to classify or reclassify our shares in one or more classes or series, to cause the issuance of additional shares and to amend our declaration of trust to increase or decrease the number of shares that we have authority to issue. These provisions, as well as other provisions of our declaration of trust and bylaws, may delay, defer or prevent a transaction or a change in control that might otherwise be in the best interests of our shareholders.

In order for us to qualify as a REIT for each taxable year, no more than 50% in value of our outstanding shares may be owned, directly or constructively, by five or fewer individuals during the last half of any calendar year, and at least 100 persons must beneficially own our shares during at least 335 days of a taxable year of 12 months, or during a proportionate portion of a shorter taxable year. "Individuals" for this purpose include natural persons, private foundations, some employee benefit plans and trusts, and some charitable trusts. To assist us in preserving our REIT qualification, among other purposes, our declaration of trust generally prohibits, among other limitations, any person from beneficially or constructively owning more than 9.8% in value or in number of shares, whichever is more restrictive, of our aggregate outstanding shares of all classes and series, the outstanding shares of any class or series of our preferred shares or our outstanding common shares. These ownership limits and the other restrictions on ownership and transfer of our shares contained in our declaration of trust could have the effect of discouraging a takeover or other transaction in which holders of our common shares might receive a premium for their shares over the then prevailing market price or which holders might believe to be otherwise in their best interests. Our board of trustees has established exemptions from these ownership limits which permits certain of our institutional investors to hold up to 20% of our common shares and up to 25% of our preferred shares.

Our level of debt and the limitations imposed on us by our debt agreements could have significant adverse consequences, including the following:

•our cash flow may be insufficient to meet our required principal and interest payments;

•to satisfy our debt obligations, we may be forced to dispose of one or more of our properties, possibly on disadvantageous terms;

•our debt level could place us at a competitive disadvantage compared to our competitors with less debt; and

•we may violate our restrictive covenants or otherwise default on our obligations, which may entitle our creditors to accelerate our debt obligations, foreclose on our properties securing our debt, enforce our guarantees and/or trigger default on our other indebtedness.

We depend on external sources of capital to acquire properties, to satisfy our debt obligations and to make distributions to our shareholders required to maintain our qualification as a REIT, and these sources of capital may not be available on favorable terms, or at all. Our access to external sources of capital depends on a number of factors, including the market's perception of our growth potential and our current and potential future earnings and our ability to continue to qualify as a REIT for U.S. federal income tax purposes. If we are unable to obtain external sources of capital, or if such capital is not available on acceptable terms, we may not be able to acquire properties when strategic opportunities exist, satisfy our debt obligations or make cash distributions to our shareholders that would permit us to qualify as a REIT or avoid paying tax on all of our net taxable income.

As of December 31, 2023, we had approximately $3.7 billion of debt outstanding, of which approximately $511.0 million, or 14.0%, is subject to variable interest rates (excluding variable-rate debt subject to interest rate swaps). If interest rates increase, our debt service obligations on variable-rate debt will increase even though the amount borrowed remains the same, while our net income, cash flows, and our ability to pay cash distributions to our shareholders correspondingly decrease. In addition, increased interest rates make the financing of any acquisition and investment activity more costly and could decrease the amount third parties are willing to pay for any properties that we wish to sell.

Although we have historically sought, and may in the future seek, to manage our exposure to interest rate volatility by using interest rate hedging arrangements, these arrangements may not be effective. Developing an effective interest rate risk strategy is complex and no strategy can completely insulate us from risks associated with interest rate fluctuations. Failure to hedge effectively against interest rate changes may adversely affect our financial condition, results of operations and ability to make cash distributions to our shareholders.

Our credit facility, term loan facilities and senior unsecured notes contain (and any new or amended facility we may enter into from time to time will likely contain) customary affirmative and negative covenants, including financial covenants that, among other things, cap our total leverage and our unsecured debt. In the event that we fail to satisfy our covenants, we would be in default under our debt agreements and may be required to repay such debt with capital from other sources. Under such circumstances, other sources of debt or equity capital may not be available to us, or may be available only on unattractive terms. Moreover, the presence of such covenants could cause us to operate our business with a view toward compliance with such covenants, which might not produce optimal returns for shareholders.

We have elected and we believe that we have qualified to be taxed as a REIT commencing with our taxable year ended December 31, 2015. We have not requested, and do not intend to request a ruling from the Internal Revenue Service ("IRS"), that we qualify as a REIT. Qualification as a REIT involves the application of highly technical and complex Code provisions and Treasury Regulations promulgated thereunder for which there are limited judicial and administrative interpretations. To qualify as a REIT, we must meet, on an ongoing basis through actual operating results, various tests regarding the nature and diversification of our assets and our income, the ownership of our outstanding shares and the amount of our distributions. Our ability to satisfy these asset tests depends upon our analysis of the characterization and fair market values of our assets, some of which are not susceptible to a precise determination, and for which we will not obtain independent appraisals. Moreover, new legislation, court decisions or administrative guidance may, in each case possibly with retroactive effect, make it more difficult or impossible for us to qualify as a REIT. Thus, while we believe that we have been organized and operated and we intend to operate so that we will continue to qualify as a REIT, given the highly complex nature of the rules governing REITs, the ongoing importance of factual determinations and the possibility of future changes in our circumstances, no assurance can be given that we have qualified or will so qualify for any particular year. These considerations also might restrict the types of assets that we can acquire or services that we can provide in the future.

We own and may in the future acquire direct or indirect interests in entities that have elected or will elect to be treated as REITs under the Code (each a "Subsidiary REIT"). If a Subsidiary REIT were to fail to qualify as a REIT, then (i) that Subsidiary REIT would become subject to U.S. federal income tax, (ii) shares in such Subsidiary REIT would cease to be qualifying assets for purposes of the asset tests applicable to REITs, and (iii) it is possible that we would fail certain of the tests applicable to REITs, in which event we would fail to qualify as a REIT unless we qualify for certain statutory relief provisions.

In addition, in order to qualify as a REIT, prior to the end of the taxable year, we must also distribute any earnings and profits of any property we acquire in certain tax-deferred transactions to the extent such earnings accrued at a time when such corporation did not qualify as a REIT. We have entered into certain transactions involving the tax-deferred acquisition of target corporations. We believe that we have distributed any earnings and profits of such target corporations attributable to any period that such corporations did not qualify as a REIT. However, no assurances can be provided in this regard, and if there is a determination that we have inherited and retained any such earnings and profits, our qualification as a REIT could be adversely impacted.

If we fail to qualify as a REIT in any taxable year, and we do not qualify for certain statutory relief provisions, we would be required to pay U.S. federal income tax on our taxable income at regular corporate rates, and distributions to our shareholders would not be deductible by us in determining our taxable income. In such a case, we might need to borrow money, sell assets, or reduce or even cease making distributions in order to pay our taxes. Our payment of income tax would reduce significantly the amount of operating cash flow to our shareholders. Furthermore, if we fail to maintain our qualification as a REIT, we no longer would be required to make distributions to our shareholders. In addition, unless we were eligible for certain statutory relief provisions, we could not re-elect to be taxed as a REIT until the fifth calendar year following the year in which we failed to qualify.

Even if we qualify for taxation as a REIT, we may be subject to certain U.S. federal, state and local taxes on our income and assets, including taxes on any undistributed income, state or local income and property and transfer taxes, including real property transfer taxes. In addition, we could, in certain circumstances, be required to pay an excise or penalty tax (which could be significant in amount) in order to utilize one or more relief provisions under the Code to maintain our qualification as a REIT. Any of these taxes would decrease operating cash flow to our shareholders.

In order to qualify as a REIT, we must distribute to our shareholders each calendar year at least 90% of our net taxable income (excluding net capital gain). To the extent that we satisfy the 90% distribution requirement, but distribute less than 100% of our net taxable income (including net capital gain), we would be subject to U.S. federal corporate income tax on our undistributed net taxable income. In addition, we will incur a 4% non-deductible excise tax on the amount, if any, by which our distributions in any calendar year are less than a minimum amount specified under U.S. federal income tax laws. Although we intend to distribute our net taxable income to our shareholders in a manner that would avoid this 4% tax, there can be no assurance that we will be able to do so, due to timing differences between our actual receipt of cash and the inclusion of items in our income for U.S. federal income tax purposes, the effect of non-deductible capital expenditures, or the creation of reserves or required debt or amortization payments.

In addition, we will be subject to a 100% tax on any income from sales or other dispositions of property (other than property treated as foreclosure property under the Code) that is held as inventory or primarily for sale to customers in the ordinary course of a trade or business by a REIT, either directly or indirectly through certain pass-through subsidiaries (a "prohibited transaction"). In order to meet the REIT qualification requirements, or to avoid the imposition of the penalty tax on prohibited transactions, we may hold some of our assets or provide certain services to our tenants through one or more TRSs, which generally will be subject to U.S. federal, state and local corporate taxes. In addition, if a REIT lends money to a TRS, the TRS may be unable to deduct all or a portion of the interest paid to the REIT, which could increase the tax liability of the TRS. In addition, the Code imposes a 100% tax on certain transactions between a TRS and its parent REIT that are not conducted on an arm's length basis. We intend to structure transactions with any TRS on terms that we believe are arm's length to avoid incurring the 100% excise tax described above. There can be no assurances, however, that we will be able to avoid application of the 100% tax. Furthermore, if we acquire appreciated assets from a corporation that is or has been a subchapter C corporation in a transaction in which the adjusted tax basis of such assets in our hands is less than the fair market value of the assets, determined at the time we acquired such assets, and if we subsequently dispose of any such assets during the 5-year period following the acquisition of the assets from the C corporation, we will be subject to tax at the highest corporate tax rates on any gain from the disposition of such assets to the extent of the excess of the fair market value of the assets on the date that we acquired such assets over the basis of such assets on such date, which we refer to as built-in gains. In addition, we have entered into certain transactions in which we acquired target entities in tax-deferred transactions. To the extent such entities had outstanding U.S. federal income tax or other tax liabilities, we would succeed to such liabilities. Payment of these taxes generally could materially and adversely affect our income, cash flow, results of operations, financial condition, liquidity and prospects, and could adversely affect the value of our common shares and our ability to make distributions to our shareholders.

To qualify as a REIT, we must ensure that at least 75% of our gross income for each taxable year, excluding certain amounts, is derived from certain real property-related sources, and at least 95% of our gross income for each taxable year, excluding certain amounts, is derived from certain real property-related sources and passive income such as dividends and interest. In addition, we must ensure that, at the end of each calendar quarter, at least 75% of the value of our total assets consists of cash, cash items, U.S. government securities and qualified real estate assets. The remainder of our investment in securities generally cannot include more than 10% of the outstanding voting securities of any one issuer (other than U.S. government securities, securities of corporations that are treated as TRSs and qualified real estate assets) or more than 10% of the total value of the outstanding securities of any one issuer (other than government securities, securities of corporations that are treated as TRSs and qualified real estate assets). In addition, in general, no more than 5% of the value of our assets can consist of the securities of any one issuer (other than U.S. government securities, securities of corporations that are treated as TRSs and qualified real estate assets), no more than 20% of the value of our total assets can be represented by securities of one or more TRSs and no more than 25% of the value of our assets can consist of debt instruments issued by publicly offered REITs that are not otherwise secured by real property. If we fail to comply with these asset requirements at the end of any calendar quarter, we must correct the failure within 30 days after the end of the calendar quarter or qualify for certain statutory relief provisions to avoid losing our REIT qualification and suffering adverse tax consequences.

To meet these tests, we may be required to take or forgo taking actions that we would otherwise consider advantageous. For instance, in order to satisfy the gross income or asset tests applicable to REITs under the Code, we may be required to forgo investments that we otherwise would make, and we may be required to liquidate from our portfolio otherwise attractive investments. In addition, we may be required to make distributions to shareholders at disadvantageous times or when we do not have funds readily available for distribution. As a result, we may need to borrow funds to meet the REIT distribution requirements even if the then prevailing market conditions are not favorable for these borrowings. Our access to third-party sources of capital depends on a number of factors, including the market's perception of our growth potential, our current debt levels, the per share trading price of our common shares, and our current and potential future earnings. We cannot assure you that we will have access to such capital on favorable terms at the desired times, or at all, which may cause us to curtail our investment activities and/or to dispose of assets at inopportune times. These actions could reduce our income and amounts available for distribution to our shareholders. Thus, compliance with the REIT requirements may hinder our investment performance.

We believe our operating partnership qualifies as a partnership for U.S. federal income tax purposes, and accordingly generally will not be subject to U.S. federal income tax on its income. Instead, each of its partners, including us, will be required to pay tax on its allocable share of our operating partnership's income. No assurance can be provided, however, that the IRS will not challenge our operating partnership's status as a partnership for U.S. federal income tax purposes, or that a court would not sustain such a challenge. If the IRS were successful in treating our operating partnership as a corporation for U.S. federal income tax purposes, we would fail to meet the gross income tests and certain of the asset tests applicable to REITs, we would cease to qualify as a REIT, and both we and our operating partnership would become subject to U.S. federal, state and local income tax. The payment by our operating partnership of income tax would reduce significantly the amount of cash available to our operating partnership to satisfy obligations to make principal and interest payments on its debt and to make distribution to its partners, including us.

The REIT provisions of the Code may limit our ability to hedge our assets and operations. Under these provisions, any income that we generate from transactions intended to hedge our interest rate risk will be excluded from gross income for purposes of the REIT 75% and 95% gross income tests if (i) the instrument (a) hedges interest rate risk on liabilities used to carry or acquire real estate assets or (b) hedges an instrument described in clause (a) for a period following the extinguishment of the liability or the disposition of the asset that was previously hedged by the hedged instrument, and (ii) the relevant instrument is properly identified under applicable Treasury regulations. Income from hedging transactions that does not meet these requirements will generally constitute non-qualifying income for purposes of both the REIT 75% and 95% gross income tests. As a result of these rules, we may have to limit our use of hedging techniques that might otherwise be advantageous or implement those hedges through a TRS. This could increase the cost of our hedging activities because our TRS would be subject to tax on gains or expose us to greater risks associated with changes in interest rates than we would otherwise want to bear, and we generally would not benefit from losses in our TRS, although, subject to limitation, such losses may be carried forward to offset future taxable income of the TRS.

Our declaration of trust provides that the board of trustees may revoke or otherwise terminate our REIT election, without the approval of our shareholders, if the board determines that it is no longer in our best interest to attempt to, or continue to, qualify as a REIT. If we cease to qualify as a REIT, we would become subject to U.S. federal income tax on our net taxable income and we generally would no longer be required to distribute any of our net taxable income to our shareholders, which may have adverse consequences on our total return to our shareholders.

At any time, the U.S. federal income tax laws or regulations governing REITs or the administrative interpretations of those laws or regulations may be changed, possibly with retroactive effect. We cannot predict if or when any new U.S. federal income tax law, regulation or administrative interpretation, or any amendment to any existing U.S. federal income tax law, regulation or administrative interpretation, will be adopted, promulgated or become effective or whether any such law, regulation or interpretation may take effect retroactively. We and our shareholders could be adversely affected by any such change in, or any new, U.S. federal income tax law, regulation or administrative interpretation. Stockholders are urged to consult with their tax advisors regarding the effects of the other legislative, regulatory or administrative developments on an investment in the Company's common stock.

Subject to applicable law and the rules of any stock exchange on which our shares may be listed or traded, our board, without common shareholder approval, may authorize us to issue additional authorized and unissued common shares and preferred shares on the terms and for the consideration it deems appropriate and may amend our declaration of trust to increase the total number of shares, or the number of shares of any class or series, that we are authorized to issue. In addition, our operating partnership may issue OP units, which are redeemable for cash or, at our option exchangeable on a one-for-one basis into common shares after an agreed period of time and certain other conditions, preferred units of limited partnership interest, which are redeemable for cash or, at our option exchangeable on a one-for-one basis into our 6.000% Series A cumulative redeemable preferred shares of beneficial interest ("Series A Preferred Shares") and subordinated performance units, which are only convertible into OP units beginning two years following the initial issuance of the applicable series and then (i) at the holder's election only upon the achievement of certain performance thresholds relating to the properties to which such subordinated performance units relate or (ii) at our election upon a retirement event of a PRO that holds such subordinated performance units or upon certain qualifying terminations.

Notwithstanding the two-year lock out period on conversions of subordinated performance units into OP units, if such subordinated performance units were convertible into OP units as of December 31, 2023, each subordinated performance unit would on average hypothetically convert into 1.55 OP units, or into an aggregate of approximately 18.8 million OP units. These amounts are based on historical financial information for the trailing twelve months ended December 31, 2023. The hypothetical conversion is calculated by dividing the average cash available for distribution, or CAD, per subordinated performance unit by 110% of the CAD per OP unit over the same period. We anticipate that as our CAD grows over time, the conversion ratio will also grow, including to levels that may exceed this amount. The actual number of OP units into which such subordinated performance units will become convertible may vary significantly and will depend upon the applicable conversion penalty and the actual CAD to the OP units and the actual CAD to the converted subordinated performance units in the one-year period ending prior to conversion. We have also granted registration rights to those persons who will be eligible to receive common shares issuable upon exchange of OP units and preferred shares issuable upon exchange of preferred units issued in our contribution transactions.

We cannot predict the effect, if any, of future sales of our common or preferred shares or the availability of shares for future sales, on the market price of our common or preferred shares. The market price of our common shares may decline significantly when the restrictions on resale by certain of our shareholders lapse. Sales of substantial amounts of common or preferred shares or the perception that such sales could occur may adversely affect the prevailing market price for our common shares.

Historically, we have paid quarterly common share dividends to our shareholders and quarterly distributions to our operating partnership unitholders, and we intend to continue to pay such dividends and distributions in amounts such that all or substantially all of our net taxable income in each year is distributed, which, along with other factors, should enable us to continue to qualify for the tax benefits accorded to a REIT under the Code. We have not established a minimum dividends payment level, and all future distributions will be made at the discretion of our board. Our ability to pay dividends will depend upon, among other factors:

•the operational and financial performance of our properties; 

•capital expenditures with respect to existing and newly acquired properties; 

•general and administrative expenses associated with our operation as a publicly-held REIT;

•maintenance of our REIT qualification;

•the amount of, and the interest rates on, our debt and the ability to refinance our debt;

•the absence of significant expenditures relating to environmental and other regulatory matters; and 

•other risk factors described in this Annual Report on Form 10-K.

Certain of these matters are beyond our control and any significant difference between our expectations and actual results could have a material adverse effect on our cash flow and our ability to make distributions to shareholders.

If we decide to issue debt securities in the future, which would rank senior to our common shares, it is likely that they will be governed by an indenture or other instrument containing covenants restricting our operating flexibility. Additionally, any equity securities or convertible or exchangeable securities that we issue in the future may have rights, preferences and privileges more favorable than those of our common shares and may result in dilution to owners of such shares. We and, indirectly, our shareholders will bear the cost of issuing and servicing such securities. Because our decision to issue debt or equity securities in any future offering will depend on market conditions and other factors beyond our control, we cannot predict or estimate the amount, timing or nature of our future offerings. Thus, holders of our common shares will bear the risk of our future offerings reducing the market price of our shares and diluting the value of their common share holdings in us.

None.

We recognize the critical importance of developing, implementing, and maintaining robust cybersecurity measures aligned to industry standards to safeguard our information systems and protect the confidentiality, integrity, and availability of our data.

We have strategically integrated cybersecurity risk management into our broader risk management framework to promote a company-wide culture of cybersecurity awareness and risk management and have incorporated cybersecurity considerations into our decision-making processes. Our risk management team works closely with our IT department to identify, evaluate and address cybersecurity risks in alignment with our business objectives and operational needs. Our risk management team also provides regular reporting to management on our enterprise cybersecurity risk posture.

Recognizing the complexity and evolving nature of cybersecurity threats, we engage a range of external experts, including cybersecurity assessors and consultants in evaluating and testing our risk management systems. These partnerships enable us to leverage specialized knowledge and insights, so that we can better understand the current and evolving cybersecurity risks and strategies. Our collaboration with these third-parties includes periodic audits, threat assessments, and consultation on security enhancements.

We are not aware of any risks from cybersecurity threats, including as a result of any cybersecurity incidents, which have materially affected or are reasonably likely to materially affect our Company, including our business strategy, results of operations, or financial condition. Refer to “Item 1A. Risk factors” in this annual report on Form 10-K, including “Security breaches through cyber-attacks, cyber-intrusions, or other methods could disrupt our information technology networks and related systems”, for additional discussion about cybersecurity-related risks.

The board of trustees is acutely aware of the critical nature of managing risks associated with cybersecurity threats and oversees the Company's cybersecurity risk management activities.

The audit committee of our board of trustees is central to the board of trustees’s oversight of cybersecurity risks and bears the primary responsibility for this domain. The members of the audit committee have a variety of expertise, including financial, regulatory and risk management. The audit committee reviews our policies with respect to risk assessment and risk management related to cybersecurity. The audit committee and the board of trustees receive updates on the Company’s cybersecurity risks and initiatives periodically. In addition, cybersecurity matters are reported to the audit committee or board of trustees so that the board of trustees and audit committee can effectively carry out their oversight role.

Our risk management committee is comprised of a cross section of the Company’s management team. The risk management committee has identified cybersecurity as a key risk to the Company’s operations and established a cybersecurity sub-committee, which is comprised of members of the risk management committee and other personnel, to focus on this key risk.

The cybersecurity sub-committee plays a pivotal role in informing the risk management committee on cybersecurity risks. They provide comprehensive briefings to the risk management committee on a regular basis. These briefings encompass a broad range of topics, including:

•Awareness of cybersecurity landscape, emerging threats, trends and developments;

•Status of ongoing cybersecurity initiatives and strategies; 

•Incident reports and learnings from any cybersecurity events;

•Compliance with regulatory requirements and industry standards; and

•Education in cybersecurity and associated risk management frameworks.

The risk management committee actively participates in strategic decisions related to cybersecurity, offering guidance and approval for major initiatives. This involvement ensures that cybersecurity considerations are a consistent focus of the Company and that the Company's cybersecurity efforts are aligned with the overall risk management framework. We have also implemented cybersecurity training at all levels of our organization and conduct periodic phishing assessment for our employees to reinforce that training.

Primary responsibility for assessing, monitoring and managing our cybersecurity risks rests with the cybersecurity sub-committee. With over a combined 45 years of experience in the field of cybersecurity, the cybersecurity sub-committee brings a wealth of expertise to their role. Their in-depth knowledge and experience are instrumental in developing and executing our cybersecurity strategies. Our cybersecurity sub-committee oversees our cybersecurity strategies, tests our compliance with standards, remediates known risks, and leads our employee training program.

The cybersecurity sub-committee stays apprised about the latest developments in cybersecurity, including potential threats and innovative risk management techniques, which is important for the effective prevention, detection, mitigation, and remediation of cybersecurity incidents. The cybersecurity sub-committee implements and oversees processes for the regular monitoring of our information systems. This includes the deployment of advanced security measures and regular system audits to identify potential vulnerabilities. In the event of a cybersecurity incident, the cybersecurity sub-committee is equipped with a well-defined incident response plan, which provides a framework to mitigate the impact of cybersecurity incidents The cybersecurity sub-committee regularly informs the risk management committee of matters related to cybersecurity risks and incidents.

This ensures that the highest levels of management are kept abreast of the cybersecurity posture and potential risks facing the Company. Furthermore, significant cybersecurity matters, and strategic risk management decisions are escalated to the board of trustees, ensuring that they have comprehensive oversight and can provide guidance on critical cybersecurity issues.

As of December 31, 2023, we held ownership interests in and operated a geographically diversified portfolio of 1,050 self storage properties located in 42 states and Puerto Rico, comprising approximately 68.6 million rentable square feet, configured in approximately 542,000 storage units, which excludes 39 self storage properties classified as held for sale to be sold to a third party in 2024. Of these properties, we reported 809 wholly-owned self storage properties on a consolidated basis that contain approximately 51.9 million rentable square feet, which excludes an additional 56 self storage properties classified as held for sale that were contributed to the 2024 Joint Venture, and we held a 25% ownership interest in 185 unconsolidated real estate venture properties that contain approximately 13.5 million rentable square feet.

The following table sets forth summary information regarding our consolidated properties by state as of December 31, 2023.

The following table sets forth summary information regarding our unconsolidated real estate venture properties by state as of December 31, 2023.

Our portfolio consists of self storage properties that are designed to offer customers convenient, affordable, and secure storage units. Generally, our properties are in highly visible locations clustered in states or markets with strong population and job growth and are specifically designed to accommodate residential and commercial tenants with features such as security systems, electronic gate entry, easy access, climate control, and pest control. Our units typically range from 25 square feet to 300 square feet, and some of our properties also offer outside storage for vehicles, boats, and equipment. We provide 24-hour access to many storage units through computer controlled access systems, as well as alarm and sprinkler systems on many of our individual storage units. Almost all of the storage units in our portfolio are leased on a month-to-month basis providing us the flexibility to increase rental rates over time as market conditions permit. Additional information on our consolidated self storage properties is contained in "Schedule III - Real Estate and Accumulated Depreciation" in this Annual Report on Form 10-K.

We are not currently subject to any legal proceedings that we consider to be material.

Not applicable.

Our common shares have been listed and traded on the NYSE under the symbol "NSA" since April 22, 2015. Prior to that time there was no public market for our common shares.

As of February 26, 2024, the Company had 83 record holders of its common shares. The 83 holders of record do not include the beneficial owners of common shares whose shares are held by a broker or bank. Such information was obtained from our transfer agent and registrar.

Since our initial quarter as a publicly-traded REIT, we have made regular quarterly distributions to our shareholders. Holders of common shares are entitled to receive distributions when declared by our board of trustees out of any assets legally available for that purpose. In order to maintain our status as a REIT for U.S. federal income tax purposes, we are required to distribute at least 90% of our "REIT taxable income," which is generally equivalent to our net taxable ordinary income, determined without regard to the deduction for dividends paid and excluding net capital gains to our shareholders annually.

Common share dividends are characterized for U.S. federal income tax purposes as ordinary income, capital gains, return of capital or a combination thereof. Each year we communicate to shareholders the tax characterization of the common share dividends paid during the preceding year. Our tax return for the year ended December 31, 2023 has not yet been filed and consequently, the taxability information presented for our dividends paid in 2023 is based upon management's estimate. The following table summarizes the taxability of our dividends per common share for the year ended December 31, 2023:

Information about our equity compensation plans is incorporated by reference to Item 12 of Part III of this Annual Report on Form 10-K.

During the three months ended December 31, 2023, the Company, in its capacity as general partner of its operating partnership, caused the operating partnership to issue 186,003 common shares to satisfy redemption requests from certain limited partners.

On October 6, 2023, the operating partnership issued 179,354 Series A-1 preferred units to affiliates of Optivest, one of the Company's existing PROs, as partial consideration for the acquisition of a self storage property. In addition, 7,600 LTIP units that were previously granted to Optivest and an affiliate of Optivest vested in connection with this transaction.

On October 24, 2023, the operating partnership issued 35,446 Series SO subordinated performance units to affiliates of Southern, one of the Company's existing PROs, in exchange for cash in connection with the acquisition of a self storage property from an unrelated third party.

Following a specified lock up period after the date of issuance set forth above, the OP units issued by the operating partnership may be redeemed from time to time by holders for a cash amount per OP unit equal to the market value of an equivalent number of common shares. The Company has the right, but not the obligation, to assume and satisfy the redemption obligation of the operating partnership described above by issuing one common share in exchange for each OP unit tendered for redemption.

The Company has elected to report early the private placement of its common shares that may occur if the Company elects to assume the redemption obligation of the operating partnership as described above in the event that OP units are in the future tendered for redemption.

Following a two-year lock-up period, holders of subordinated performance units may elect, only upon the achievement of certain performance thresholds relating to the properties to which such subordinated performance units relate, to convert all or a portion of such subordinated performance units into OP units one time each year by submitting a completed conversion notice prior to December 1 of such year. All duly submitted conversion notices will become effective on the immediately following January 1. For additional information about the conversion or exchange of subordinated performance units into OP units, see Note 9 in Item 8 of this report.

As of February 26, 2024, other than those OP units held by the Company, 40,514,212 OP units were outstanding (including 787,284 outstanding Long-Term Incentive Plan Units ("LTIP units") and 2,120,491 outstanding OP units in certain consolidated subsidiaries of the operating partnership ("DownREIT OP units"), which are convertible into, or exchangeable for, OP units on a one-for-one basis, subject to certain conditions).

These issuances were exempt from registration under Section 4(a)(2) of the Securities Act of 1933, as amended.

On July 11, 2022, the Company approved a share repurchase program authorizing the repurchase of up to $400.0 million of the Company's common shares, under which $256,892 of commons shares remain available for repurchase. On December 1, 2023, the Company approved a new share repurchase program authorizing, but not obligating, the repurchase of up to $275.0 million of the Company's common shares. The table below summarizes all of our repurchases of common shares during three months ended December 31, 2023:

The following chart compares the yearly cumulative total shareholder return for our common shares with the cumulative shareholder return of companies on (i) the S&P 500 Index, (ii) the Russell 2000 and (iii) the Nareit All Equity REIT Index as provided by Nareit for the period beginning December 31, 2018 and ending December 31, 2023.

						Period Ending
Index						12/31/2018						12/31/2019						12/31/2020						12/31/2021						12/31/2022						12/31/2023
National Storage Affiliates Trust						$	100					$	132					$	148					$	293					$	160					$	195
S&P 500						100						131						156						200						164						207
Russell 2000						100						126						151						173						138						161
Nareit All Equity REIT Index						100						129						122						172						129						144

The foregoing item assumes $100.00 invested on December 31, 2018, with dividends reinvested. The Performance Graph will not be deemed to be incorporated by reference into any filing by NSA under the Securities Act of 1933, as amended, or the Securities Exchange Act of 1934, as amended, except to the extent that NSA specifically incorporates the same by reference.

None.

National Storage Affiliates Trust is a fully integrated, self-administered and self-managed real estate investment trust organized in the state of Maryland on May 16, 2013. We have elected and we believe that we have qualified to be taxed as a REIT commencing with our taxable year ended December 31, 2015. We serve as the sole general partner of our operating partnership, a Delaware limited partnership formed on February 13, 2013 to conduct our business, which is focused on the ownership, operation, and acquisition of self storage properties located predominantly within the top 100 MSAs throughout the United States.

Our vice chairperson of the board of trustees and former chief executive officer, Arlen D. Nordhagen, co-founded SecurCare Self Storage, Inc. in 1988 to invest in and manage self storage properties. While growing SecurCare to over 150 self storage properties, Mr. Nordhagen recognized a market opportunity for a differentiated public self storage REIT that would leverage the benefits of national scale by integrating multiple experienced regional self storage operators with local operational focus and expertise. We believe that his vision, which is the foundation of the Company, aligns the interests of our PROs, with those of our public shareholders by allowing our PROs to participate alongside our shareholders in our financial performance and the performance of our PROs' managed portfolios. Our PRO structure offers our PROs a unique opportunity to serve as regional property managers for their managed portfolios and directly participate in the potential upside of those properties while simultaneously diversifying their investment to include a broader portfolio of self storage properties. Over time, largely through our unconsolidated real estate ventures and internalization of three of our largest PROs, SecurCare, Northwest and Move It, we have developed a full service internally-staffed property management platform to complement our PRO structure.

Through our property management platform, we direct, manage and control the day-to-day operations and affairs of certain consolidated properties and our unconsolidated real estate ventures under our iStorage, Northwest, SecurCare and Move It brands. As of December 31, 2023, our property management platform managed and controlled 532 of our consolidated properties and 185 of our unconsolidated real estate venture properties, which excludes 39 consolidated properties classified as held for sale to be sold to a third party in 2024. As of December 31, 2023, our PROs managed the day-to-day operations of 333 of our consolidated properties.

For properties managed by our PROs, our structure promotes operator accountability as subordinated performance units issued to our PROs in exchange for the contribution of their properties are entitled to distributions only after those properties satisfy minimum performance thresholds. In the event of a material reduction in operating cash flow, distributions on our subordinated performance units will be reduced before or disproportionately to distributions on our common shares held by our common shareholders. In addition, we expect our PROs will generally co-invest subordinated equity in the form of subordinated performance units in each acquisition that they source, and the value of these subordinated performance units will fluctuate with the performance of their managed portfolios. Therefore, our PROs are incentivized to select acquisitions that are expected to exceed minimum performance thresholds, thereby increasing the value of their subordinated equity stake. We expect that our shareholders will benefit from the higher levels of property performance that our PROs are incentivized to deliver.

We had eight PROs as of December 31, 2023: Optivest, Guardian, Southern, Blue Sky, Moove In, Hide Away, Storage Solutions and Personal Mini. We seek to further expand our platform by continuing to recruit additional established self storage operators, while integrating our operations through the implementation of centralized initiatives, including management information systems, revenue enhancement, and cost optimization programs. Our national platform allows us to capture cost savings by eliminating redundancies and utilizing economies of scale across the property management platforms of our PROs while also providing greater access to lower-cost capital.

Effective January 1, 2023, Move It Self Storage and its controlled affiliates, elected to retire as one our PROs. As a result of the retirement, on January 1, 2023, management of our properties in the Move It managed portfolio was transferred to us and the Move It brand name and related intellectual property was internalized by us, and we discontinued payment of any supervisory and administrative fees or reimbursements to Move It.

We seek to own properties that are well located in high quality sub-markets with highly accessible street access and attractive supply and demand characteristics, providing our properties with strong and stable cash flows that are less sensitive to the fluctuations of the general economy. Many of these markets have multiple barriers to entry against increased supply, including zoning restrictions against new construction and new construction costs that we believe are higher than our properties' fair market value. We maintain an active acquisition pipeline that we expect will continue to drive our future growth.

As of December 31, 2023, we owned a geographically diversified portfolio of 809 self storage properties, located in 38 states and Puerto Rico, comprising approximately 51.9 million rentable square feet, configured in approximately 407,000 storage units, which excludes self storage properties classified as held for sale consisting of (i) 39 self storage properties located in eight states, comprising approximately 2.4 million rentable square feet, configured in approximately 18,000 storage units to be sold to a third party in 2024 and (ii) 56 self storage properties located in seven states, comprising approximately 3.2 million rentable square feet, configured in approximately 24,000 storage units that were contributed to the 2024 Joint Venture in 2024. Of these properties, 306 were acquired by us from our PROs, 502 were acquired by us from third-party sellers and one was acquired by us from the 2016 Joint Venture.

Subsequent to December 31, 2023, we entered into the 2024 Joint Venture (as defined in Note 5 to the consolidated financial statements in Item 8), in which we have a 25% ownership interest. During 2024, we contributed 56 self storage properties containing approximately 3.2 million rentable square feet, configured in over 24,000 storage units and located across seven states to the 2024 Joint Venture.

As of December 31, 2023, our 2023 Joint Venture (as defined in Note 5 to the consolidated financial statements in Item 8), in which we have a 25% ownership interest, did not own or operate any self storage properties. The agreement allows for equity capital contributions of up to $400 million from the 2023 JV Members over a 24-month period starting in December 2023, with options to extend the investment time period by two additional six-month periods.

As of December 31, 2023, our 2018 Joint Venture, in which we have a 25% interest, owned and operated a portfolio of 104 properties containing approximately 7.8 million rentable square feet, configured in approximately 64,000 storage units and located across 17 states.

As of December 31, 2023, our 2016 Joint Venture, in which we have a 25% ownership interest, owned and operated a portfolio of 81 properties containing approximately 5.7 million rentable square feet, configured in approximately 47,000 storage units and located across 13 states.

When reviewing our results of operations it is important to consider the timing of acquisition and disposition activity. We acquired 20 self storage properties and annexes to existing properties during the year ended December 31, 2023 and 45 self storage properties during the year ended December 31, 2022. We disposed of 32 self storage properties and classified self storage properties as held for sale consisting of (i) 39 self storage properties to be sold to a third party in 2024 and (ii) 56 self storage properties that were contributed to the 2024 Joint Venture in 2024, during the year ended December 31, 2023. As a result of these and other factors, we do not believe that our historical results of operations discussed and analyzed below are comparable or necessarily indicative of our future results of operations or cash flows.

The following discussion and analysis of the results of our operations and financial condition for the year ended December 31, 2023 compared to the year ended December 31, 2022 should be read in conjunction with the accompanying consolidated financial statements included in Item 8. The discussion and analysis of the results of our operations and financial condition for the year ended December 31, 2022 compared to the year ended December 31, 2021, can be found in Part II, "Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations" of our Annual Report on Form 10-K for the year ended December 31, 2022, which was filed with the SEC on February 27, 2023.

Certain figures, such as interest rates and other percentages, included in this section have been rounded for ease of presentation. Percentage figures included in this section have not in all cases been calculated on the basis of such rounded figures but on the basis of such amounts prior to rounding. For this reason, percentage amounts in this section may vary slightly from those obtained by performing the same calculations using the figures in our consolidated financial statements or in the associated text. Certain other amounts that appear in this section may similarly not sum due to rounding.

The following table illustrates the changes in rental revenue, other property-related revenue, management fees and other revenue, property operating expenses, and other expenses for the year ended December 31, 2023 compared to the year ended December 31, 2022 (dollars in thousands):