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Unsecured Debt (Tables)
 12 Months Ended
Dec. 31, 2021
Debt Disclosure [Abstract]  
Schedule of Unsecured Debt
Unsecured debt consists of the following as of December 31, 2021 and 2020 ($ in thousands):
20212020Weighted Average
Maturity
In Years as of December 31, 2021
Unsecured bonds private placement - fixed rate$— $199,950 N/A
Term loan - variable rate— 549,380 N/A
Bonds public offering - fixed rate5,307,196 4,858,655 8.7
Unsecured debt, net (1)
5,307,196 5,607,985  
Lines of credit (2)
341,257 — N/A
Total unsecured debt$5,648,453 $5,607,985  
Weighted average interest rate on fixed rate unsecured bonds private placement and bonds public offering3.3 %3.4 % 
Weighted average interest rate on variable rate term loan— %1.7 % 
Weighted average interest rate on lines of credit1.0 %1.0 % 

(1)Includes unamortized discount, net of premiums, of $9.9 million and $10.1 million and unamortized debt issuance costs of $32.9 million and $31.9 million as of December 31, 2021 and 2020, respectively.
(2)Lines of credit, related to the Company's two lines of unsecured credit aggregating $1.24 billion, excludes unamortized debt issuance costs of $4.4 million and $3.7 million as of December 31, 2021 and 2020, respectively. These debt issuance costs are included in prepaid expenses and other assets on the consolidated balance sheets. As of December 31, 2021, the Company's $1.2 billion credit facility had an interest rate of LIBOR plus 0.775%, which is based on a tiered rate structure tied to the Company's credit ratings and a scheduled maturity date of September 2025 with three six-month extensions, exercisable at the Company's option. As of December 31, 2021, the Company's $35.0 million working capital unsecured line of credit had an interest rate of LIBOR plus 0.775%, which is based on a tiered rate structure tied to the Company's credit ratings, and a scheduled maturity date of February 2023.
Summary of Unsecured Private Placement Bonds The following is a summary of the Company’s unsecured private placement bonds as of December 31, 2021 and 2020 ($ in thousands):
Maturity20212020Coupon
Rate
Senior unsecured private placement notesApril 2021$— $100,000 4.27 %
Senior unsecured private placement notesJune 2021— 50,000 4.30 %
Senior unsecured private placement notesAugust 2021— 50,000 4.37 %
   $— $200,000  
Summary of Senior Unsecured Notes The following is a summary of the Company’s senior unsecured notes as of December 31, 2021 and 2020 ($ in thousands):
Maturity20212020Coupon
Rate
Senior notesJanuary 2023$— $300,000 3.375 %
Senior notesMay 2023300,000 300,000 3.250 %
Senior notesMay 2024400,000 400,000 3.875 %
Senior notesApril 2025500,000 500,000 3.500 %
Senior notesApril 2026450,000 450,000 3.375 %
Senior notesMay 2027350,000 350,000 3.625 %
Senior notesMarch 2028450,000 — 1.700 %
Senior notesMarch 2029500,000 500,000 4.000 %
Senior notesJanuary 2030550,000 550,000 3.000 %
Senior notesJanuary 2031300,000 300,000 1.650 %
Senior notesJune 2031300,000 — 2.550 %
Senior notesMarch 2032650,000 650,000 2.650 %
Senior notesMarch 2048300,000 300,000 4.500 %
Senior notesSeptember 2050300,000 300,000 2.650 %
   $5,350,000 $4,900,000  
Mortgage notes payable consist of the following as of December 31, 2021 and 2020 ($ in thousands):
 20212020
Fixed rate mortgage notes payable$415,350 $419,323 
Variable rate mortgage notes payable (1)
223,609 224,227 
Total mortgage notes payable (2)
$638,959 $643,550 
Number of properties securing mortgage notes12 12 
Remaining terms
1-25 years
1-26 years
Weighted average interest rate2.7 %2.7 %
Schedule of Unsecured Debt Principal Payments Excluding Lines of Credit The aggregate scheduled principal payments of unsecured debt payable, excluding lines of credit, at December 31, 2021 are as follows ($ in thousands):
2022$— 
2023300,000 
2024400,000 
2025500,000 
2026450,000 
Thereafter3,700,000 
$5,350,000 
The aggregate scheduled principal payments of mortgage notes payable at December 31, 2021 are as follows ($ in thousands):
2022$43,188 
20232,945 
20243,109 
2025133,054 
202699,405 
Thereafter356,224 
 $637,925 

(1)Variable rate mortgage notes payable, including $224.4 million in bonds that have been converted to variable rate through total return swap contracts, consists of multifamily housing mortgage revenue bonds secured by deeds of trust on rental properties and guaranteed by collateral pledge agreements, payable monthly at a variable rate as defined in the Loan Agreement (approximately 1.1% at December 2021 and 1.2% at December 2020) including credit enhancement and
underwriting fees. Among the terms imposed on the properties, which are security for the bonds, is a requirement that 20% of the apartment homes are subject to tenant income criteria. Once the bonds have been repaid, the properties may no longer be obligated to comply with such tenant income criteria. Principal balances are due in full at various maturity dates from December 2027 through December 2046. The Company had no interest rate cap agreements as of December 31, 2021 and 2020, respectively.
(2)Includes total unamortized premium, net of discounts, of $2.5 million and $3.9 million and reduced by unamortized debt issuance costs of $1.5 million and $1.8 million as of December 31, 2021 and 2020, respectively.