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Debt
 12 Months Ended
Dec. 31, 2024
Debt Disclosure [Abstract]  
Debt Debt
The Company's debt, which consists of unsecured notes, mortgage notes payable, the Credit Facility and the Commercial Paper Program, each as defined below, as of December 31, 2024 and 2023 is summarized below. The following amounts and discussion do not include the mortgage notes related to the communities classified as held for sale, if any, as of December 31, 2024 and 2023, as shown in the accompanying Consolidated Balance Sheets (dollars in thousands) (see Note 6, "Real Estate Disposition Activities"). The weighted average interest rates in the following table for secured and unsecured notes include costs of financing such as credit enhancement fees, trustees' fees, the impact of interest rate hedges and mark-to-market adjustments.
 December 31, 2024December 31, 2023
Fixed rate unsecured notes$7,400,000 3.4 %$7,300,000 3.3 %
Fixed rate mortgage notes payable—conventional and tax-exempt333,479 3.9 %333,892 3.9 %
Variable rate mortgage notes payable—conventional and tax-exempt400,950 5.2 %410,150 5.5 %
Total mortgage notes payable and unsecured notes8,134,429 3.5 %8,044,042 3.5 %
Credit Facility— — %— — %
Commercial paper— — %— — %
Total principal outstanding8,134,429 3.5 %8,044,042 3.5 %
Less deferred financing costs and debt discount (1)(57,180)(62,220)
Total$8,077,249 $7,981,822 
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(1) Excludes deferred financing costs and debt discount associated with the Credit Facility and Commercial Paper Program which are included in prepaid expenses and other assets on the accompanying Consolidated Balance Sheets.

The Company has a $2,250,000,000 revolving variable rate unsecured credit facility with a syndicate of banks (the "Credit Facility") which matures in September 2026. The interest rate that would be applicable to borrowings under the Credit Facility was 5.30% at December 31, 2024 and was composed of (i) the Secured Overnight Financing Rate ("SOFR"), applicable to the period of borrowing for a particular draw of funds from the facility (e.g., one month to maturity, three months to maturity, etc.), plus (ii) the current borrowing spread to SOFR of 0.805% per annum, which consisted of a 0.10% SOFR adjustment plus 0.705% per annum, assuming a daily SOFR borrowing rate. The borrowing spread to SOFR can vary from SOFR plus 0.63% to SOFR plus 1.38% based upon the rating of the Company's unsecured senior notes. There is also an annual facility commitment fee of 0.12% of the borrowing capacity under the facility, which can vary from 0.095% to 0.295% based upon the rating of the Company's unsecured senior notes. The Credit Facility contains a sustainability-linked pricing component which provides for interest rate margin and commitment fee reductions or increases by meeting or missing targets related to environmental sustainability, specifically greenhouse gas emission reductions, with the adjustment determined annually. The annual determination under the sustainability-linked pricing component occurred in July 2024, maintaining reductions of approximately 0.02% to the interest rate margin and 0.005% to the commitment fee due to our achievement of sustainability targets.

The Company has an unsecured commercial paper note program (the "Commercial Paper Program") with the maximum aggregate face or principal amount outstanding at any one time not to exceed $500,000,000. Under the terms of the Commercial Paper Program, the Company may issue, from time to time, unsecured commercial paper notes with varying maturities of less than one year. The Commercial Paper Program is backstopped by the Company's commitment to maintain available borrowing capacity under the Credit Facility in an amount equal to actual borrowings under the Commercial Paper Program.
The availability on the Company's Credit Facility as of December 31, 2024 and 2023, respectively, was as follows (dollars in thousands):
 December 31, 2024December 31, 2023
Credit Facility commitment$2,250,000 $2,250,000 
Credit Facility outstanding— — 
Commercial paper outstanding— — 
Letters of credit outstanding (1)(1,714)(1,914)
Total Credit Facility available$2,248,286 $2,248,086 
_____________________________________
(1) In addition, the Company had $45,910 and $58,116 outstanding in additional letters of credit unrelated to the Credit Facility as of December 31, 2024 and 2023, respectively.

During the year ended December 31, 2024:

•In May 2024, the Company issued $400,000,000 principal amount of unsecured notes in a public offering under its existing shelf registration statement for proceeds net of underwriting fees of approximately $396,188,000, before considering the impact of other offering costs. The notes mature in June 2034 and were issued at a 5.35% interest rate, resulting in a 5.05% effective rate including the impact of offering costs and hedging activity.

•In November 2024, the Company repaid $300,000,000 principal amount of its 3.50% unsecured notes at par at maturity.

In the aggregate, secured notes payable mature at various dates from March 2027 through July 2066, and are secured by certain apartment communities (with a net carrying value of $1,245,662,000, excluding communities classified as held for sale, as of December 31, 2024).

Scheduled payments and maturities of secured notes payable and unsecured notes outstanding at December 31, 2024 were as follows (dollars in thousands):
YearSecured notes
principal payments
and maturities		Unsecured notes maturitiesStated interest rate of
unsecured notes
2025$11,365 $525,000 3.45 %
300,000 3.50 %
202611,811 475,000 2.95 %
300,000 2.90 %
2027250,159 400,000 3.35 %
202819,002 450,000 3.20 %
400,000 1.90 %
2029131,561 450,000 3.30 %
20309,000 700,000 2.30 %
20319,600 600,000 2.45 %
203210,400 700,000 2.05 %
203311,900 350,000 5.00 %
400,000 5.30 %
203412,800 400,000 5.35 %
Thereafter256,831 350,000 3.90 %
300,000 4.15 %
300,000 4.35 %
$734,429 $7,400,000  
The Company's unsecured notes are redeemable at the Company's option, in whole or in part, generally at a redemption price equal to the greater of (i) 100% of their principal amount or (ii) the sum of the present value of the remaining scheduled payments of principal and interest discounted at a rate equal to the yield on U.S. Treasury securities with a comparable maturity plus a spread between 10 and 30 basis points depending on the specific series of unsecured notes, plus accrued and unpaid interest to the redemption date.

The Company is subject to financial covenants contained in the Credit Facility and the indentures under which the unsecured notes were issued. The principal financial covenants include the following:

•limitations on the amount of total and secured debt in relation to the Company's overall capital structure;
•limitations on the amount of the Company's unsecured debt relative to the undepreciated basis of real estate assets that are not encumbered by property-specific financing; and
•minimum levels of debt service coverage.

The Company was in compliance with these covenants at December 31, 2024.