AVALONBAY COMMUNITIES INC

Our real estate investments consist primarily of current apartment operating communities ("Current Communities"), consolidated and unconsolidated communities in various stages of development ("Development" communities and "Unconsolidated Development" communities) and Development Rights (as defined below). Our Current Communities are further classified as Same Store communities, Other Stabilized communities, Redevelopment communities and Unconsolidated communities. While we generally establish the classification of communities on an annual basis, we update the classification of communities during the calendar year to the extent that our plans with regard to the disposition or redevelopment of a community change, or if something occurs that materially impacts the operations of a community such as a casualty loss. The following is a description of each category:

Current Communities are categorized as Same Store, Other Stabilized, Redevelopment or Unconsolidated according to the following attributes:

•Same Store is composed of consolidated communities where a comparison of operating results from the prior year to the current year is meaningful as these communities were owned and had stabilized occupancy as of the beginning of the respective prior year. For the year ended December 31, 2025, Same Store communities are consolidated for financial reporting purposes, had stabilized occupancy as of January 1, 2024, are not conducting or expected to conduct substantial redevelopment activities and are not held for sale as of December 31, 2025. A community is considered to have stabilized occupancy at the earlier of (i) attainment of 90% physical occupancy or (ii) the one year anniversary of completion of development or redevelopment.

•Other Stabilizedis composed of completed consolidated communities that we own and that are not Same Store but which have stabilized occupancy, as defined above, as of January 1, 2025, or which were acquired subsequent to January 1, 2024. Other Stabilized excludes communities that are conducting or conducted substantial redevelopment activities within the current year, as defined below.

•Redevelopmentis composed of consolidated communities where substantial redevelopment occurred or is in progress. Redevelopment is considered substantial when (i) capital invested is expected to exceed the lesser of $5,000,000 or 10% of the community's pre-redevelopment basis and (ii) physical occupancy is below or is expected to be below 90% during, or as a result of, the redevelopment activity.

•Unconsolidated is composed of communities that we have an indirect ownership interest in through our investment interest in an unconsolidated joint venture.

Development is composed of consolidated communities that are either currently under construction, were under construction and were completed during the current year or where construction has been complete for less than one year and that do not have stabilized occupancy. These communities may be partially or fully complete and operating.

Development Rights are development opportunities in the early phase of the development process where we either have an option to acquire land or enter into a leasehold interest, where we are the buyer under a long-term conditional contract to purchase land, where we control the land through a ground lease or own land to develop a new community, or where we are the designated developer in a public-private partnership. We capitalize related pre-development costs incurred in pursuit of new developments for which we currently believe future development is probable.

We currently lease our corporate headquarters located in Arlington, Virginia, as well as our other regional and administrative offices, under operating leases.

As of December 31, 2025, communities that we owned or held a direct or indirect interest in were classified as follows:

Our holdings under each of the above categories are discussed on the following pages.

We generally establish the composition of our Same Store communities portfolio annually. Changes in the Same Store communities portfolios for the years ended December 31, 2025, 2024 and 2023 were as follows:

(1) Communities were removed from our Same Store portfolio if we believed that planned activity for the upcoming year would result in that community's expected operations not being comparable to the prior year, including (i) when we intended to undertake a significant capital renovation, such that the community was classified as a Redevelopment community; (ii) when we intended to dispose of a community; or (iii) when a significant casualty loss occurred.

Current Communities

Our Current Communities include garden-style apartment communities consisting of multi-story buildings of stacked flats and/or townhome apartments in landscaped settings, as well as mid and high rise apartment communities consisting of larger elevator-served buildings of four or more stories, frequently with structured parking. As of January 31, 2026, our Current Communities consisted of the following:

As discussed in Item 1. "Business," we operate under four core brands: Avalon, AVA, eaves by Avalon and Kanso. We believe that this branding differentiation allows us to target our product offerings to multiple customer groups and submarkets within our existing geographic footprint.

We also have an extensive and ongoing maintenance program to continually maintain and enhance our communities and apartment homes. The aesthetic appeal of our communities, and a service-oriented property management team that is focused on the specific needs of residents, enhances market appeal. We believe our mission of "Creating a Better Way to Live" helps us achieve higher rental rates and occupancy levels while minimizing resident turnover and operating expenses.

Our Current Communities are located in the following geographic markets:

We manage and operate substantially all of our Current Communities. During the year ended December 31, 2025, we completed construction of four communities containing 1,320 apartment homes, acquired 12 wholly-owned communities containing 3,378 apartment homes and sold nine operating communities containing 2,102 apartment homes. In addition, during the year ended December 31, 2025, we acquired our joint venture partner's 50% interest in Avalon Alderwood Place, a 328 apartment home community in Lynnwood, WA. With the buyout of the joint venture partner's interest, Avalon Alderwood Place is now a wholly owned apartment community and consolidated for financial reporting purposes.

Of the Current Communities, as of January 31, 2026, we owned (directly or through wholly-owned subsidiaries):

•275 operating communities, including 268 with a full fee simple or absolute ownership interest, and seven that are on land subject to a land lease. The land leases have various expiration dates from July 2046 to April 2106, and three of the land leases are used to support tax advantaged structures that ultimately allow us to purchase the land upon lease expiration. The Company has purchase options for all land leases expiring prior to 2062.

•Eight operating communities held by unconsolidated entities in which we hold an ownership interest, including a membership interest in four unconsolidated limited liability companies. One of the ventures, NYTA MF Investors LLC, through subsidiaries owns a fee simple interest in three operating communities and a leasehold interest in two additional operating communities. The other three ventures each hold a fee simple interest in an operating community.

•A general partnership interest in one partnership structured as a “DownREIT,” which is consolidated and owns nine communities. In this partnership, one of our wholly-owned subsidiaries is the general partner. The units representing limited partner interests in the DownREIT (“DownREIT Units”) are entitled to receive distributions at the same rate as dividends on a share of the Company’s common stock. Beginning on April 30, 2026, holders of DownREIT Units may present some or all of their units for redemption, being entitled to receive a cash amount per unit that is related to the then fair market value of the Company’s common stock, except that in lieu of such cash redemption the Company may elect to redeem units in exchange for an equal number of shares of the Company’s common stock. At January 31, 2026, there were 1,059,995 DownREIT Units outstanding.

Development Communities

As of December 31, 2025, we owned or held a direct interest in 24 Development Communities under construction. We hold, directly or through wholly-owned subsidiaries, a full fee simple ownership interest in all of our wholly-owned Development Communities, with the exception of one Development Community in which we own a leasehold interest. We expect these Development Communities, when completed, to add a total of 8,572 apartment homes and 69,000 square feet of commercial space to our portfolio for an estimated total capitalized cost, including land acquisition costs, of approximately $3,307,000,000. We cannot assure you that we will meet our schedule for construction completion or that we will meet our budgeted costs, either individually, or in the aggregate. You should carefully review Item 1A. "Risk Factors" for a discussion of the risks associated with development activity and our discussion under Item 7. "Management's Discussion and Analysis of Financial Condition and Results of Operations" (including the factors identified under "Forward-Looking Statements") for further discussion of development activity.

The following table presents a summary of the Development Communities under construction.

(1)Projected total capitalized cost includes all capitalized costs projected to be or actually incurred to develop the respective Development Community, determined in accordance with GAAP, including land acquisition costs, construction costs, real estate taxes, capitalized interest and loan fees, permits, professional fees, allocated development overhead and other regulatory fees, as well as costs incurred for first generation commercial tenants such as tenant improvements and leasing commissions.

(2)Stabilized operations is defined as the earlier of (i) attainment of 90% or greater physical occupancy or (ii) the one-year anniversary of completion of development.

(3)Development communities containing at least 10,000 square feet of commercial space include Avalon West Windsor (19,000 sf), Avalon North Palm Beach (10,000 sf), and Avalon Mission Valley (31,000 sf).

(4)Communities being developed through our Developer Funding Program ("DFP"). The DFP utilizes third-party multifamily developers to source and construct communities which we own and operate.

(5)During the year ended December 31, 2025, the Company expanded the Avalon Pleasanton development in Pleasanton, CA, adding an additional 280 apartment homes, and increasing the total estimated capitalized costs by $160,000,000.

(6)During the year ended December 31, 2025, the Company expanded the Avalon Tech Ridge I development in Austin, TX, adding an additional 100 rental townhomes, and increasing the total estimated capitalized costs by $33,000,000.

During the year ended December 31, 2025, we completed the development of the following wholly-owned communities:

(1)Total capitalized cost is as of December 31, 2025. We generally anticipate incurring additional costs associated with these communities which are customary for new developments.

(2)Avalon South Miami includes 32,000 square feet of commercial space.

Unconsolidated Operating Communities

As of December 31, 2025, we had investments in the following unconsolidated real estate entities accounted for under the equity method of accounting. See Note 5, "Investments," of the Consolidated Financial Statements included elsewhere in this report. For joint ventures holding operating apartment communities as of December 31, 2025, detail of the real estate and associated indebtedness underlying our unconsolidated investments is presented in the following table (dollars in thousands).

(1)We have not guaranteed the debt of these unconsolidated investees and bear no responsibility for the repayment other than for the Arts District joint venture as discussed below in footnote 5.

(2)Borrowing on this community is comprised of two mortgage loans. The interest rate is the weighted average interest rate as of December 31, 2025.

(3)Borrowing on this dual-branded community is comprised of a single mortgage loan. This dual-branded community is subject to a leasehold interest which is not included in the total capitalized cost.

(4)In July 2025, MVP I, LLC repaid $103,000 of outstanding secured indebtedness at par upon maturity. The equity investors contributed capital in proportion to their ownership interests to repay the outstanding loan.

(5)AVA Arts District completed development during the year ended December 31, 2024 and achieved stabilized residential operations. In June 2025, the joint venture secured a variable rate loan with a maturity date of July 2028 and used the proceeds to repay the previously existing $158,735 variable rate construction loan which was scheduled to mature in August 2025. The outstanding borrowing is subject to an interest rate cap, which will limit the interest rate to 8.2%, based on the current borrowing spread. While we guarantee 25% of the new loan, any amounts payable under the guarantee are obligations of the joint venture partners in proportion to their ownership interest.

(6)In addition to leasehold assets, there were net other assets of $38,961 as of December 31, 2025 associated with our unconsolidated real estate investments which are primarily cash and cash equivalents.

(7)During the year ended December 31, 2025, the Company acquired its joint venture partner's 50% interest in Avalon Alderwood Place which is now a wholly owned apartment community and consolidated for financial reporting purposes.

Development Rights

At December 31, 2025, we had $123,751,000 in acquisition and related capitalized costs for direct interests in seven land parcels we own and intend to develop. In addition, we had $73,237,000 in capitalized costs (including legal fees, design fees and related overhead costs) related to pursuits probable of future development including (i) 20 Development Rights for which we control the land parcel, typically through a conditional agreement or option to purchase or lease the land, as well as (ii) costs incurred for five Development Rights that we expect to construct as additional phases of our existing stabilized operating communities on land we own. Collectively, the land held for development and associated costs for deferred Development Rights relate to 32 Development Rights for which we expect to develop new apartment communities in the future. The Development Rights range from those beginning design and architectural planning to those that have completed site plans and drawings and can begin construction almost immediately. We estimate that the successful completion of all of these communities would ultimately add approximately 9,032 apartment homes to our portfolio. Substantially all of these apartment homes will offer features like those offered by the communities we currently own.

The Development Rights are in different stages of the due diligence and regulatory approval process. The decisions as to which of the Development Rights to invest in, if any, or to continue to pursue once an investment in a Development Right is made, are business judgments that we make after we perform financial, demographic and other analyses. In the event that we do not proceed with a Development Right, we generally would not recover any of the capitalized costs incurred in the pursuit of those communities, unless we were to recover amounts in connection with the sale of land; however, we cannot guarantee a recovery. Pre-development costs incurred in the pursuit of Development Rights for which future development is not yet considered probable are expensed as incurred. In addition, if the status of a Development Right changes, making future development no longer probable, any unrecoverable capitalized pre-development costs are charged to expense. During 2025, we incurred a charge of $10,846,000 for expensed transaction, development and other pursuit costs, net of recoveries, which include development pursuits that were not yet probable of future development at the time incurred, or for pursuits that we determined were no longer probable of being developed. The amount for 2025 includes a write-off of $3,668,000 related to one development opportunity that we determined is no longer probable.

You should carefully review Item 1A. "Risk Factors," for a discussion of the risks associated with Development Rights.

Land Acquisitions

We select land for development and follow established procedures that we believe minimize both the cost and the risks of development. During 2025, we acquired the following land parcels for an aggregate investment of $161,959,000.

(1)Projected total capitalized cost includes all capitalized costs incurred to date (if any) and projected to be incurred to develop the respective community, determined in accordance with GAAP, including land and related acquisition costs, construction costs, real estate taxes, capitalized interest and loan fees, permits, professional fees, allocated development overhead and other regulatory fees, as well as costs incurred for first generation commercial tenants such as tenant improvements and leasing commissions, net of projected proceeds for any planned sales of associated outparcels and other real estate.

(2)Communities are currently under construction.

(3)Community is being developed through our DFP.

Acquisition & Disposition Activity

We buy and sell assets based on our long-term investment criteria and target portfolio allocation. We also dispose of assets when capital and real estate markets allow us to realize a portion of the value created over our ownership periods, and we generally redeploy the proceeds from those sales to develop, redevelop and acquire communities. Pending such redeployment, we will generally use the proceeds from the sale of these communities to reduce amounts outstanding under our Credit Facility or Commercial Paper Program, repay other indebtedness, or retain the cash proceeds on our balance sheet until they are redeployed into acquisition, development or redevelopment activity. At times, we will set aside the proceeds from the sale of communities into a cash escrow account to facilitate a tax-deferred, like-kind exchange transaction. From January 1, 2025 to January 31, 2026, (i) we acquired 12 wholly-owned communities containing 3,378 apartment homes for an aggregate purchase price of $826,029,000, (ii) we acquired our joint venture partner's 50% interest in Avalon Alderwood Place, a 328 apartment home community in Lynnwood, WA for a purchase price of $71,250,000 and (iii) we sold our interest in ten wholly-owned communities, containing 2,345 apartment homes, with an aggregate gross sales price of $916,680,000.

Insurance and Risk of Uninsured Losses

We maintain commercial general liability insurance and property insurance with respect to all of our communities, with insurance policies issued by a combination of third-party insurers as well as a wholly-owned captive insurance company. These policies, along with other insurance policies we maintain, have policy specifications, insured and self-insured limits, exclusions and deductibles that we consider commercially reasonable. We utilize a wholly-owned captive insurance company to insure certain types and amounts of risks, which include property damage and resulting business interruption losses, general liability insurance and other construction related liability risks. The captive is utilized to insure other limited levels of risk, which may be in part reinsured by third-party insurance. There are, however, certain types of losses (including, but not limited to, losses arising from nuclear liability, pandemic or acts of war) that are not insured, in full or in part, because they are either uninsurable or the cost of insurance makes it, in management’s view, economically impractical. You should carefully review the discussion under Part I, Item 1A. "Risk Factors" of this Form 10-K for a discussion of risks associated with an uninsured property or casualty loss.

Our communities are insured for certain property damage and business interruption losses through a combination of community specific insurance policies and/or a master property insurance program which covers the majority of our communities. This master property program provides a $400,000,000 limit for any single occurrence, subject to certain aggregate sub-limits, per occurrence sub-limits, and exclusions. Under the master property program, we are subject to various deductibles per occurrence, as well as additional self-insured retentions. In addition to our potential liability for the various policy self-insured retentions and deductibles, our captive insurance company is directly responsible for 100% of the first $25,000,000 of losses (per occurrence) excess of deductibles and an additional $5,000,000 of losses (per occurrence) incurred by the master property insurance policy excess of $25,000,000. Our master property insurance program includes coverage for losses resulting from customary perils, including but not limited to wildfires and windstorms. Limits, deductibles, self-insured retentions and coverages may increase or decrease annually during the insurance renewal process, which occurs on different dates throughout the calendar year.

Many of our West Coast communities are located within the general vicinity of active earthquake faults. Many of our communities are near, and thus susceptible to, the major fault lines in California, including the San Andreas Fault, the Hayward Fault or other geological faults that are known or unknown. We cannot assure you that an earthquake would not cause damage or losses greater than our current insured levels. We procure property damage and resulting business interruption insurance coverage with a loss limit of $175,000,000 for any single occurrence and in the annual aggregate for losses resulting from earthquakes, subject to deductibles and self-insured retentions. However, for any losses resulting from earthquakes at communities located in California or Washington, the loss limit is $200,000,000 for any single occurrence and in the annual aggregate, subject to deductibles and self-insured retentions. A portion of coverage is included in the aforementioned self-insurance limits underwritten through the captive.

Our Southeast Florida communities could be impacted by significant storm events like hurricanes. We include coverage for losses arising from these types of weather events within our master property insurance program. We cannot assure you that a significant storm event would not cause damage or losses greater than our current insured levels.

Our communities and construction sites are insured for third-party liability losses through a combination of community specific insurance policies and/or coverage provided under a master commercial general liability and umbrella/excess insurance program. The master commercial general liability and umbrella/excess insurance policies cover the majority of our communities and construction sites and are subject to certain coverage limitations and exclusions, which we believe are commercially reasonable. After applicable self-insured retentions borne by us, our captive insurance company is directly responsible for the first $2,000,000 of losses (per occurrence) covered by the master general liability insurance policy.

Just as with office buildings, transportation systems and government buildings, apartment communities could become targets of terrorism. Our communities are insured for terrorism related losses through the Terrorism Risk Insurance Program Reauthorization Act ("TRIPRA") program. This coverage extends to most of our casualty exposures (subject to deductibles and insured limits). We have also purchased private-market insurance for property damage due to terrorism with limits of $600,000,000 per occurrence and in the annual aggregate that includes certain coverages (not covered under TRIPRA) such as domestic-based terrorism. This insurance, often referred to as "non-certified" terrorism insurance, is subject to deductibles, limits and exclusions.

An additional consideration for insurance coverage and potential uninsured losses is mold growth or other environmental contamination. Mold growth may occur when excessive moisture accumulates in buildings or on building materials, particularly if the moisture problem remains undiscovered or is not addressed over a period of time. If a significant mold problem arises at one of our communities, we could be required to undertake a costly remediation program to contain or remove the mold from the affected community and could be exposed to other liabilities. For further discussion of the risks and our related prevention and remediation activities, please refer to the discussion under Part I, Item 1A. "Risk Factors - We may incur costs due to environmental contamination or non-compliance" elsewhere in this report. We cannot provide assurance that we will have coverage under our existing policies for property damage or liability to third parties arising from exposure to mold or a claim of exposure to mold at one of our communities.

We also maintain other insurance programs that provide coverage for events including but not limited to employee dishonesty, loss of data, and liability associated with management of certain employee benefit plans. These policies are subject to maximum loss limits and include coverage limitations or exclusions that may preclude us from fully recovering.

The amount or types of insurance we maintain may not be sufficient to cover all losses and we may change our policy limits, coverages, and self-insured retentions or deductibles at any time.