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Real Estate Investments - Mortgage Debt Joint Venture (Details) - Corporate Joint Venture	3 Months Ended
	Mar. 31, 2022 USD ($) option
Real Estate
Coupon rate (percent)	3.19%
Debt face amount	$ 1,076,625,000
Seaport Innovation LLC | Massachusetts
Real Estate
Coupon rate (percent)	3.53%
Debt face amount	$ 620,000,000
The LSMD Fund REIT LLC
Real Estate
Coupon rate (percent)	3.46%
Debt face amount	$ 189,800,000
The LSMD Fund REIT LLC | California
Real Estate
Coupon rate (percent)	2.20%
Debt face amount	$ 266,825,000
Number of extension options | option	3
Extension term	1 year
The LSMD Fund REIT LLC | California | SOFR
Real Estate
Basis points per annum (as a percent)	1.90%
The LSMD Fund REIT LLC | California | SOFR | Interest Rate Cap
Real Estate
Basis points per annum (as a percent)	4.00%

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