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Fair Value of Assets and Liabilities - Assets and Liabilities (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024 USD ($) property	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) property	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Impairment of assets | $	$ 23,031	$ 1,156	$ 41,718	$ 18,380
Number of Properties | property	368		368
Held for sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Number of Properties | property	25		25
Life Sciences Property
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Impairment of assets | $	$ 23,031
Corporate Joint Venture
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Number of Properties | property	11		11
Corporate Joint Venture | Seaport Innovation LLC
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Equity method investment ownership percentage	10.00%		10.00%
Holding period			10 years
Number of Properties | property	1		1
Corporate Joint Venture | Seaport Innovation LLC | Discount Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Measurement input	0.0750		0.0750
Corporate Joint Venture | Seaport Innovation LLC | Exit Capitalization Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Measurement input	0.0600		0.0600
Corporate Joint Venture | The LSMD Fund REIT LLC
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Equity method investment ownership percentage	20.00%		20.00%
Number of Properties | property	10		10
Corporate Joint Venture | The LSMD Fund REIT LLC | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Holding period			10 years
Corporate Joint Venture | The LSMD Fund REIT LLC | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Holding period			13 years
Corporate Joint Venture | The LSMD Fund REIT LLC | Discount Rate | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Measurement input	0.0650		0.0650
Corporate Joint Venture | The LSMD Fund REIT LLC | Discount Rate | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Measurement input	0.0800		0.0800
Corporate Joint Venture | The LSMD Fund REIT LLC | Exit Capitalization Rate | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Measurement input	0.0525		0.0525
Corporate Joint Venture | The LSMD Fund REIT LLC | Exit Capitalization Rate | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Measurement input	0.0700		0.0700
Corporate Joint Venture | The LSMD Fund REIT LLC | Direct Capitalization Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Measurement input	0.0500		0.0500
Recurring Fair Value Measurements Assets | Level 3 | Joint Venture | Carrying Value | Seaport Innovation LLC
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Investments in affiliates, fair value | $	$ 65,590		$ 65,590		$ 85,699
Recurring Fair Value Measurements Assets | Level 3 | Joint Venture | Carrying Value | The LSMD Fund REIT LLC
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Investments in affiliates, fair value | $	44,923		44,923		44,217
Non-Recurring Fair Value Measurements Assets | Life Sciences Property
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Aggregate sales price | $	$ 6,286		$ 6,286
Non-Recurring Fair Value Measurements Assets | Life Sciences Property | Held for sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Number of Properties | property	1		1
Non-Recurring Fair Value Measurements Assets | Level 2 | Carrying Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Real estate properties held for sale | $	$ 6,286		$ 6,286		$ 0

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