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Investments in real estate - Acquisitions (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 USD ($) ft² property | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Business Acquisition [Line Items] |  |  |
Purchase Price | $ 248,699 | $ 265,750 | $ 2,877,861
Investments in real estate | $ 32,110,039 | 31,633,511 |
285, 299, 307, and 345 Dorchester Avenue |  |  |
Business Acquisition [Line Items] |  |  |
Number of real estate properties | property | 0 |  |
Purchase Price | $ 155,321 |  |
428 Westlake Avenue North |  |  |
Business Acquisition [Line Items] |  |  |
Number of real estate properties | property | 1 |  |
Purchase Price | $ 47,600 |  |
Other markets |  |  |
Business Acquisition [Line Items] |  |  |
Purchase Price | 46,490 |  |
Acquired-in-Place Leases |  |  |
Business Acquisition [Line Items] |  |  |
Finite-Lived Intangible Assets, Acquired Through Acquisitions | 4,400 |  |
Above Market Leases |  |  |
Business Acquisition [Line Items] |  |  |
Finite-Lived Intangible Assets, Acquired Through Acquisitions | $ 492 |  |
Future development | 285, 299, 307, and 345 Dorchester Avenue |  |  |
Business Acquisition [Line Items] |  |  |
Area of Real Estate Property | ft² | 1,040,000 |  |
Operating with future development and redevelopment | 428 Westlake Avenue North |  |  |
Business Acquisition [Line Items] |  |  |
Area of Real Estate Property | ft² | 90,626 |  |
Operating property |  |  |
Business Acquisition [Line Items] |  |  |
Weighted average remaining amortization period, acquired in-place and below-market leases | 2 years 9 months 18 days |  |
Operating property | Acquired-in-Place Leases |  |  |
Business Acquisition [Line Items] |  |  |
Weighted average remaining amortization period, acquired in-place and below-market leases | 2 years 6 months |  |
Operating property | Above Market Leases |  |  |
Business Acquisition [Line Items] |  |  |
Weighted average remaining amortization period, acquired in-place and below-market leases | 5 years 1 month 6 days |  |
North America |  |  |
Business Acquisition [Line Items] |  |  |
Number of real estate properties | property | 391 |  |
Area of Real Estate Property | ft² | 39,800,000 |  |
Purchase Price | $ 249,411 |  |
Investments in real estate | $ 32,110,039 | $ 31,633,511 |
North America | Future development |  |  |
Business Acquisition [Line Items] |  |  |
Area of Real Estate Property | ft² | 1,040,000 |  |
North America | Operating with future development and redevelopment |  |  |
Business Acquisition [Line Items] |  |  |
Area of Real Estate Property | ft² | 90,626 |  |

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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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