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Gain (Loss) From Change Of Control, Net Of Tax

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Number Of Adjacent Sites Currently Held

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Number Of Properties Acquired

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Area of land held.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Face (par) amount of debt instrument at time of issuance.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Cash outflow related to amounts given in advance to show or confirm an intention to complete an acquisition of land, buildings, other structures, or any item classified as real estate.

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The cash outflow from the acquisition of real estate intended to generate income for the owner; excludes land acquired for use by the owner.

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The cash outflow from the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures on it and so forth; includes real estate intended to generate income for the owner; excludes real estate acquired for use by the owner.

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The cash outflow associated with the purchase of real estate held-for-investment and real estate joint ventures.

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The cash inflow from the sale of an investment interest in a joint venture that the reporting entity has not previously accounted for using consolidation or the equity method of accounting.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Real Estate Transactions - Real Estate Investments (Details)	1 Months Ended							3 Months Ended		12 Months Ended
	Apr. 30, 2021 USD ($) property	Feb. 28, 2021 USD ($) property	Dec. 31, 2020 USD ($) property	Nov. 30, 2020 USD ($) property	Oct. 31, 2020 USD ($) a property	Jul. 31, 2020 USD ($) property	Apr. 30, 2020 USD ($)	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2020 asset
Real Estate [Line Items]
Loss from change of control								$ (1,042,000)	$ (167,434,000)
Debt assumed								$ 5,803,487,000
Life science joint ventures
Real Estate [Line Items]
Investment ownership percentage								49.00%
Waldwick
Real Estate [Line Items]
Number of properties acquired \| property					1
Investment ownership percentage					100.00%
Additional ownership percentage acquired					15.00%
Payments to acquire real estate joint ventures					$ 4,000,000
Gain from change of control, net					$ 6,000,000
Mbk Jv
Real Estate [Line Items]
Number of properties acquired \| property				1
Proceeds from divestiture of interest in joint venture				$ 11,000,000
Loss from change of control				16,000,000
Debt assumed				36,000,000
San Francisco, California
Real Estate [Line Items]
Area of land \| a					12
Payments to acquire land					$ 128,000,000
Number of adjacent sites currently held \| property					2
Payments for deposits on real estate acquisitions				$ 10,000,000
San Francisco, California \| Subsequent Event \| First Tranche
Real Estate [Line Items]
Payments to acquire land	$ 61,000,000
Massachusetts
Real Estate [Line Items]
Payments to acquire real estate			$ 54,000,000
Massachusetts \| Life science joint ventures
Real Estate [Line Items]
Investment ownership percentage			49.00%							49.00%
Medical office \| Subsequent Event \| Mortgage Debt
Real Estate [Line Items]
Amount	$ 142,000,000
Medical office \| TENNESSEE
Real Estate [Line Items]
Number of properties acquired \| property		1
Payments to acquire real estate		$ 13,000,000
Medical office \| COLORADO \| Subsequent Event
Real Estate [Line Items]
Number of properties acquired \| property	1
Payments to acquire real estate	$ 38,000,000
Medical office \| UNITED STATES \| Subsequent Event
Real Estate [Line Items]
Number of properties acquired \| property	14
Payments to acquire real estate	$ 371,000,000
Medical office \| ARIZONA
Real Estate [Line Items]
Number of properties acquired \| property						1
Payments to acquire real estate						$ 27,000,000
Medical office \| Indiana, Missouri, Illinois
Real Estate [Line Items]
Number of properties acquired \| property					7
Payments to acquire real estate					$ 169,000,000
Medical office \| T X
Real Estate [Line Items]
Number of properties acquired \| property			1
Payments to acquire real estate			$ 34,000,000
Life science
Real Estate [Line Items]
Number of properties acquired \| asset										1
Life science \| Massachusetts
Real Estate [Line Items]
Number of properties acquired \| property			3
Payments to acquire real estate			$ 610,000,000				$ 320,000,000
Land parcel \| Mbk Jv
Real Estate [Line Items]
Number of properties acquired \| property				1