Noncash, Acquisition Purchase Price

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- Definition

Noncontrolling Interest In Joint Ventures, Derecognized

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- Definition

Redeemable Noncontrolling Interest, Accretion Rate

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- Definition

Redeemable Noncontrolling Interest, Equity, Unpaid Distributions

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No definition available.

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- Definition

Area of a real estate property.

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No definition available.

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- Definition

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

+ References

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-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
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- Definition

The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
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- Definition

Decrease in noncontrolling interest (for example, but not limited to, redeeming or purchasing the interests of noncontrolling shareholders, issuance of shares (interests) by the non-wholly owned subsidiary to the parent entity for other than cash, and a buyback of shares (interest) by the non-wholly owned subsidiary from the noncontrolling interests).

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- Definition

Carrying amount of the equity interests owned by noncontrolling shareholders, partners, or other equity holders in joint ventures included in the entity's consolidated financial statements.

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- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

+ References

No definition available.

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- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ References

No definition available.

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- Definition

The number of real estate properties owned as of the balance sheet date.

+ References

No definition available.

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- Definition

The cash inflow associated with the deconsolidation of a previously consolidated subsidiary or the sale of investment in consolidated subsidiaries (generally greater than 50 percent).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (b)
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- Definition

The cash inflow from the sale of formerly productive land held for sale, anything permanently fixed to it, including buildings, structures on it, and so forth.

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-Topic 230
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-Subparagraph (c)
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- Definition

As of the reporting date, the aggregate carrying amount of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 480
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- Definition

The aggregate fair value as of the reporting date of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Consolidated and unconsolidated real estate joint ventures (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2025 USD ($)	Dec. 31, 2025 USD ($) ft²	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Jul. 31, 2025 USD ($)	Jun. 30, 2025 ft² property
Schedule of Equity Method Investments
Transfer of noncontrolling interests		$ (48,710)	$ (3,637)	$ (7,766)
Gain on sales of real estate		642,445	129,312	277,037
Acquisition of our partner’s noncontrolling interest in 199 East Blaine Street		96,543	0	0
Proceeds from sales of real estate		$ 2,320,875	$ 1,220,206	$ 1,195,743
1655 and 1725 Third Street
Schedule of Equity Method Investments
Equity interest percentage (in percent)		10.00%
101 West Dickman Street
Schedule of Equity Method Investments
Equity interest percentage (in percent)		58.40%
50 and 60 Binney Street \| Alexandria
Schedule of Equity Method Investments
Noncontrolling interest, ownership percentage by parent		34.00%
75/125 Binney Street \| Alexandria
Schedule of Equity Method Investments
Noncontrolling interest, ownership percentage by parent		40.00%
100 and 225 Binney Street and 300 Third Street \| Alexandria
Schedule of Equity Method Investments
Noncontrolling interest, ownership percentage by parent		30.00%
15 Necco Street \| Alexandria
Schedule of Equity Method Investments
Noncontrolling interest, ownership percentage by parent		56.70%
Alexandria Center for Science and Technology - Mission Bay \| Alexandria
Schedule of Equity Method Investments
Noncontrolling interest, ownership percentage by parent		25.00%
211 and 213 East Grand Avenue \| Alexandria
Schedule of Equity Method Investments
Noncontrolling interest, ownership percentage by parent		30.00%
500 Forbes Boulevard \| Alexandria
Schedule of Equity Method Investments
Noncontrolling interest, ownership percentage by parent		10.00%
Alexandria Center for Life Science – Millbrae \| Alexandria
Schedule of Equity Method Investments
Noncontrolling interest, ownership percentage by parent		48.60%
3215 Merryfield Row \| Alexandria
Schedule of Equity Method Investments
Noncontrolling interest, ownership percentage by parent		30.00%
Campus Point by Alexandria \| Alexandria
Schedule of Equity Method Investments
Noncontrolling interest, ownership percentage by parent		56.40%
5200 Illumina Way \| Alexandria
Schedule of Equity Method Investments
Noncontrolling interest, ownership percentage by parent		51.00%
9625 Towne Centre Drive \| Alexandria
Schedule of Equity Method Investments
Noncontrolling interest, ownership percentage by parent		30.00%
SD Tech by Alexandria \| Alexandria
Schedule of Equity Method Investments
Noncontrolling interest, ownership percentage by parent		50.00%
Summers Ridge Science Park \| Alexandria
Schedule of Equity Method Investments
Noncontrolling interest, ownership percentage by parent		30.00%
1201 and 1208 Eastlake Avenue East \| Alexandria
Schedule of Equity Method Investments
Noncontrolling interest, ownership percentage by parent		30.00%
400 Dexter Avenue North \| Alexandria
Schedule of Equity Method Investments
Noncontrolling interest, ownership percentage by parent		30.00%
800 Mercer Street \| Alexandria
Schedule of Equity Method Investments
Noncontrolling interest, ownership percentage by parent		60.00%
99 Coolidge Avenue
Schedule of Equity Method Investments
Redeemable Noncontrolling Interest, Equity, Fair Value		$ 49,600
Noncontrolling Interest in Joint Ventures					$ 42,000
Noncontrolling interest		$ 48,700
Redeemable Noncontrolling Interest, Accretion Rate		4.05%
Accrued distributions		$ 844
99 Coolidge Avenue \| Additional Paid-In Capital
Schedule of Equity Method Investments
Transfer of noncontrolling interests		6,700
Pacific Technology Park
Schedule of Equity Method Investments
Number of real estate properties \| property						5
Proceeds from Divestiture of Interest in Consolidated Subsidiaries	$ 96,000
Noncontrolling Interest In Joint Ventures, Derecognized	82,400
Gain on sales of real estate	$ 9,300	$ 9,290
Pacific Technology Park \| Operating property
Schedule of Equity Method Investments
Area of Real Estate Property \| ft²						544,352
Pacific Technology Park \| Future development
Schedule of Equity Method Investments
Area of Real Estate Property \| ft²		0
Pacific Technology Park \| Alexandria
Schedule of Equity Method Investments
Noncontrolling interest, ownership percentage by parent	50.00%					50.00%
Ownership percentage by noncontrolling owners						50.00%
199 East Blaine Street
Schedule of Equity Method Investments
Noncontrolling Interest in Joint Ventures	$ 30,300
Area of Real Estate Property \| ft²						115,084
Acquisition of our partner’s noncontrolling interest in 199 East Blaine Street	94,400
199 East Blaine Street \| Additional Paid-In Capital
Schedule of Equity Method Investments
Transfer of noncontrolling interests	$ 66,300
199 East Blaine Street \| Alexandria
Schedule of Equity Method Investments
Noncontrolling interest, ownership percentage by parent		100.00%				30.00%
Ownership percentage by noncontrolling owners	70.00%					70.00%
Pacific Technology Park and 199 East Blaine Street
Schedule of Equity Method Investments
Proceeds from sales of real estate	$ 1,600	$ 1,570
409 and 499 Illinois Street
Schedule of Equity Method Investments
Proceeds from Divestiture of Interest in Consolidated Subsidiaries		721,100
Gain on sales of real estate		$ 416,749
409 and 499 Illinois Street \| Operating property
Schedule of Equity Method Investments
Area of Real Estate Property \| ft²		466,297
409 and 499 Illinois Street \| Future development
Schedule of Equity Method Investments
Area of Real Estate Property \| ft²		0
409 and 499 Illinois Street \| Alexandria
Schedule of Equity Method Investments
Noncontrolling interest, ownership percentage by parent		25.00%
Proceeds from Divestiture of Interest in Consolidated Subsidiaries		$ 180,273
Gain on sales of real estate		103,900
601, 611, 651, 681, 685, 701, and 751 Gateway Boulevard
Schedule of Equity Method Investments
Proceeds from Divestiture of Interest in Consolidated Subsidiaries		560,400
Gain on sales of real estate		$ 0
601, 611, 651, 681, 685, 701, and 751 Gateway Boulevard \| Operating property
Schedule of Equity Method Investments
Area of Real Estate Property \| ft²		1,104,826
601, 611, 651, 681, 685, 701, and 751 Gateway Boulevard \| Future development
Schedule of Equity Method Investments
Area of Real Estate Property \| ft²		528,684
601, 611, 651, 681, 685, 701, and 751 Gateway Boulevard \| Operating with future development and redevelopment
Schedule of Equity Method Investments
Area of Real Estate Property \| ft²		1,600,000
601, 611, 651, 681, 685, 701, and 751 Gateway Boulevard \| Alexandria
Schedule of Equity Method Investments
Proceeds from Divestiture of Interest in Consolidated Subsidiaries		$ 283,173
285, 299, 307, and 345 Dorchester Avenue
Schedule of Equity Method Investments
Gain on sales of real estate		$ 0
285, 299, 307, and 345 Dorchester Avenue \| Operating property
Schedule of Equity Method Investments
Area of Real Estate Property \| ft²		0
285, 299, 307, and 345 Dorchester Avenue \| Future development
Schedule of Equity Method Investments
Area of Real Estate Property \| ft²		1,040,000
285, 299, 307, and 345 Dorchester Avenue \| Alexandria
Schedule of Equity Method Investments
Noncontrolling interest, ownership percentage by parent		60.00%
Proceeds from Divestiture of Interest in Consolidated Subsidiaries		$ 33,500
601, 611, 651, 681, 685, and 701 Gateway Boulevard \| Alexandria
Schedule of Equity Method Investments
Noncontrolling interest, ownership percentage by parent		50.00%
751 Gateway Boulevard \| Alexandria
Schedule of Equity Method Investments
Noncontrolling interest, ownership percentage by parent		51.00%