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Investments in real estate - Real estate asset sales (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2024 USD ($) ft² property | Jun. 30, 2024 USD ($) | Dec. 31, 2024 USD ($) ft² property | Dec. 31, 2023 USD ($) ft² | Dec. 31, 2022 USD ($)
Real Estate Properties [Line Items] |  |  |  |  |
Proceeds from sales of real estate |  |  | $ 1,220,206 | $ 1,195,743 | $ 994,331
Gain on sales of real estate |  |  | 129,312 | 277,037 | 537,918
Impairment of real estate |  | $ 30,800 | 223,068 | $ 461,114 | 64,969
Potential Asset Acquisition, Area of Real Estate | ft² |  |  |  | 1,400,000 |
Potential Asset Acquisition, Consideration |  | $ 366,800 |  |  |
Purchase Price |  |  | 248,699 | $ 265,750 | $ 2,877,861
Notes Receivable |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss, Noncurrent | $ 103,427 |  | $ 103,427 |  |
1401/1413 Research Boulevard |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Real Estate Property, Ownership Interest Sold | 100.00% |  | 100.00% |  |
Area of Real Estate Property | ft² | 84,837 |  | 84,837 |  |
Proceeds from sales of real estate |  |  | $ 22,913 |  |
Gain on sales of real estate |  |  | $ 3,328 |  |
Equity interest percentage (in percent) | 65.00% |  | 65.00% |  |
Noncontrolling Interests |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Number of real estate properties | property | 67 |  | 67 |  |
4755 and 4757 Nexus Center Drive and 4796 Executive Drive |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Real Estate Property, Ownership Interest Sold | 100.00% |  | 100.00% |  |
Area of Real Estate Property | ft² | 177,804 |  | 177,804 |  |
Proceeds from sales of real estate |  |  | $ 120,000 |  |
Gain on sales of real estate |  |  | $ 47,511 |  |
14225 Newbrook Drive |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Real Estate Property, Ownership Interest Sold | 100.00% |  | 100.00% |  |
Area of Real Estate Property | ft² | 248,186 |  | 248,186 |  |
Proceeds from sales of real estate |  |  | $ 80,500 |  |
Gain on sales of real estate |  |  | $ 37,074 |  |
1165 Eastlake Avenue East |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Real Estate Property, Ownership Interest Sold | 100.00% |  | 100.00% |  |
Area of Real Estate Property | ft² | 100,086 |  | 100,086 |  |
Proceeds from sales of real estate |  |  | $ 149,985 |  |
Gain on sales of real estate |  |  | $ 21,535 |  |
9444 Waples Street |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Real Estate Property, Ownership Interest Sold | 100.00% |  | 100.00% |  |
Area of Real Estate Property | ft² | 149,000 |  | 149,000 |  |
Proceeds from sales of real estate |  |  | $ 31,000 |  |
Gain on sales of real estate |  |  | $ 8,175 |  |
6040 George Watts Hill Drive |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Real Estate Property, Ownership Interest Sold | 100.00% |  | 100.00% |  |
Area of Real Estate Property | ft² | 149,585 |  | 149,585 |  |
Proceeds from sales of real estate |  |  | $ 93,500 |  |
Gain on sales of real estate |  |  | $ 5,004 |  |
100 Minuteman Road |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Real Estate Property, Ownership Interest Sold | 100.00% |  | 100.00% |  |
Area of Real Estate Property | ft² | 308,970 |  | 308,970 |  |
Proceeds from sales of real estate |  |  | $ 67,300 |  |
Gain on sales of real estate |  |  | $ 4,042 |  |
849/863 Mitten Road/866 Malcolm Road |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Real Estate Property, Ownership Interest Sold | 100.00% |  | 100.00% |  |
Area of Real Estate Property | ft² | 103,857 |  | 103,857 |  |
Proceeds from sales of real estate |  |  | $ 24,000 |  |
99 A Street |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Real Estate Property, Ownership Interest Sold | 100.00% |  | 100.00% |  |
Area of Real Estate Property | ft² | 235,000 |  | 235,000 |  |
Proceeds from sales of real estate |  |  | $ 13,350 |  |
219 East 42nd Street |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Real Estate Property, Ownership Interest Sold | 100.00% |  | 100.00% |  |
Area of Real Estate Property | ft² | 349,947 |  | 349,947 |  |
Proceeds from sales of real estate |  |  | $ 60,000 |  |
6101 Quadrangle Drive |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Real Estate Property, Ownership Interest Sold | 100.00% |  | 100.00% |  |
Area of Real Estate Property | ft² | 31,600 |  | 31,600 |  |
Proceeds from sales of real estate |  |  | $ 11,310 |  |
Other markets |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Proceeds from sales of real estate |  |  | 38,617 |  |
Gain on sales of real estate |  |  | $ 5,971 |  |
One Moderna Way |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Real Estate Property, Ownership Interest Sold | 100.00% |  | 100.00% |  |
Area of Real Estate Property | ft² | 722,130 |  | 722,130 |  |
Proceeds from sales of real estate |  |  | $ 369,439 |  |
Impairment of real estate |  |  | $ 40,900 |  |
Number of real estate properties | property | 4 |  | 4 |  |
215 First Street, 150 Second Street, and 11 Hurley Street |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Real Estate Property, Ownership Interest Sold | 100.00% |  | 100.00% |  |
Area of Real Estate Property | ft² | 552,513 |  | 552,513 |  |
Proceeds from sales of real estate |  |  | $ 245,539 |  |
Impairment of real estate |  |  | $ 6,300 |  |
Number of real estate properties | property | 3 |  | 3 |  |
10048 and 10219 Meanley Drive and 10277 Scripps Ranch Boulevard |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Real Estate Property, Ownership Interest Sold | 100.00% |  | 100.00% |  |
Area of Real Estate Property | ft² | 444,041 |  | 444,041 |  |
Proceeds from sales of real estate |  |  | $ 55,000 |  |
10048 and 10219 Meanley Drive and 10277 Scripps Ranch Boulevard | Notes Receivable |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss, Noncurrent | $ 25,000 |  | 25,000 |  |
Costa Verde and Scripps Science Park |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Impairment of real estate |  |  | $ 65,900 |  |
Number of real estate properties | property | 5 |  | 5 |  |
Costa Verde and Scripps Science Park | Operating property |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Area of Real Estate Property | ft² | 203,223 |  | 203,223 |  |
Costa Verde and Scripps Science Park | Future development |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Area of Real Estate Property | ft² | 1,500,000 |  | 1,500,000 |  |
Alexandria Center for Life Science - New York City |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Gross investments in real estate | $ 168,400 |  | $ 168,400 |  |
Sorrento Mesa Held For Sale Properties |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Area of Real Estate Property | ft² | 102,392 |  | 102,392 |  |
Number of real estate properties | property | 2 |  | 2 |  |
830 4th Avenue South |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Area of Real Estate Property | ft² | 45,615 |  | 45,615 |  |
Impairment of real estate |  |  | $ 13,700 |  |
Potential Asset Disposition, Consideration | $ 8,000 |  |  |  |
University Town Center Portfolio Sale |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Area of Real Estate Property | ft² | 100,831 |  | 100,831 |  |
Impairment of real estate |  |  | $ 36,900 |  |
Number of real estate properties | property | 3 |  | 3 |  |
Potential Asset Disposition, Consideration |  |  | $ 200,000 |  |
University Town Center Portfolio Sale | Future development |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Area of Real Estate Property | ft² | 1,000,000 |  | 1,000,000 |  |
Alexandria | 9444 Waples Street |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Proceeds from sales of real estate |  |  | $ 15,500 |  |
Gain on sales of real estate |  |  | $ 3,200 |  |
North America |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Area of Real Estate Property | ft² | 39,800,000 |  | 39,800,000 |  |
Proceeds from sales of real estate |  |  | $ 1,359,540 |  |
Gain on sales of real estate |  |  | $ 129,312 |  |
Number of real estate properties | property | 391 |  | 391 |  |
Purchase Price |  |  | $ 249,411 |  |
Gross investments in real estate | $ 37,214,474 |  | $ 37,214,474 | $ 36,344,543 |
North America | Future development |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Area of Real Estate Property | ft² | 1,040,000 |  | 1,040,000 |  |
Canada |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Number of real estate properties | property | 11 |  | 11 |  |
TEXAS |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Impairment of real estate |  |  | $ 6,100 |  |
Potential Asset Disposition, Consideration | $ 70,000 |  |  |  |
TEXAS | Future development |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Area of Real Estate Property | ft² | 1,400,000 |  | 1,400,000 |  |

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 13 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-13 + Details
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