Schedule III - Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation (Details) - USD ($) $ in Thousands		Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Total Costs
Total		$ 34,817,521	$ 37,735,218	$ 36,618,530	$ 34,299,503
Accumulated Depreciation		(6,127,525)	$ (5,625,179)	$ (4,985,019)	$ (4,354,063)
Investment in Real Estate, Federal Income Tax Basis		35,080,000
Investment in real estate over cost basis of real estate for federal income tax purpose		$ (266,600)
Maximum | Buildings and building improvements
Total Costs
Estimated useful life		40 years
Maximum | Land improvements
Total Costs
Estimated useful life		20 years
North America
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		$ 0
Initial Costs
Land		6,662,721
Buildings & Improvements		9,038,274
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		19,116,526
Total Costs
Land		6,662,721
Buildings & Improvements		(28,154,800)
Total	[1]	34,817,521
Accumulated Depreciation	[2]	(6,127,525)
Net Cost Basis		28,689,996
Alexandria Center at Kendall Square
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		558,885
Buildings & Improvements		783,224
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		1,667,101
Total Costs
Land		558,885
Buildings & Improvements		(2,450,325)
Total	[1]	3,009,210
Accumulated Depreciation	[2]	(542,912)
Net Cost Basis		2,466,298
Alexandria Center at One Kendall Square
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		405,164
Buildings & Improvements		576,213
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		1,128,205
Total Costs
Land		405,164
Buildings & Improvements		(1,704,418)
Total	[1]	2,109,582
Accumulated Depreciation	[2]	(353,934)
Net Cost Basis		1,755,648
Alexandria Technology Square
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		0
Buildings & Improvements		619,658
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		400,903
Total Costs
Land		0
Buildings & Improvements		(1,020,561)
Total	[1]	1,020,561
Accumulated Depreciation	[2]	(421,077)
Net Cost Basis		599,484
The Arsenal on the Charles
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		191,797
Buildings & Improvements		354,611
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		833,114
Total Costs
Land		191,797
Buildings & Improvements		(1,187,725)
Total	[1]	1,379,522
Accumulated Depreciation	[2]	(183,364)
Net Cost Basis		1,196,158
480 Arsenal Way, 446, 458, 500, and 550 Arsenal Way, and 99 Coolidge
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		69,803
Buildings & Improvements		15,614
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		456,626
Total Costs
Land		69,803
Buildings & Improvements		(472,240)
Total	[1]	542,043
Accumulated Depreciation	[2]	(90,938)
Net Cost Basis		451,105
Alexandria Center for Life Science - Fenway
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		912,016
Buildings & Improvements		617,552
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		970,396
Total Costs
Land		912,016
Buildings & Improvements		(1,587,948)
Total	[1]	2,499,964
Accumulated Depreciation	[2]	(133,961)
Net Cost Basis		2,366,003
5, 10, and 15 Necco Street
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		277,554
Buildings & Improvements		55,897
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		433,568
Total Costs
Land		277,554
Buildings & Improvements		(489,465)
Total	[1]	767,019
Accumulated Depreciation	[2]	(37,419)
Net Cost Basis		729,600
Alexandria Center for Life Science - Waltham
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		141,629
Buildings & Improvements		513,901
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		482,225
Total Costs
Land		141,629
Buildings & Improvements		(996,126)
Total	[1]	1,137,755
Accumulated Depreciation	[2]	(47,264)
Net Cost Basis		1,090,491
19, 215, 225, and 235 Presidential Way
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		32,136
Buildings & Improvements		118,391
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		30,103
Total Costs
Land		32,136
Buildings & Improvements		(148,494)
Total	[1]	180,630
Accumulated Depreciation	[2]	(41,181)
Net Cost Basis		139,449
30, 200, and 3000 Minuteman Road
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		59,227
Buildings & Improvements		187,205
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		88,083
Total Costs
Land		59,227
Buildings & Improvements		(275,288)
Total	[1]	334,515
Accumulated Depreciation	[2]	(7,018)
Net Cost Basis		327,497
Other - Greater Boston
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		96,995
Buildings & Improvements		0
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		20,014
Total Costs
Land		96,995
Buildings & Improvements		(20,014)
Total	[1]	117,009
Accumulated Depreciation	[2]	(6)
Net Cost Basis		117,003
Alexandria Center for Science and Technology - Mission Bay
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		145,025
Buildings & Improvements		8,345
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		589,408
Total Costs
Land		145,025
Buildings & Improvements		(597,753)
Total	[1]	742,778
Accumulated Depreciation	[2]	(143,028)
Net Cost Basis		599,750
Alexandria Center for Advanced Technologies - South San Francisco
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		59,199
Buildings & Improvements		0
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		642,237
Total Costs
Land		59,199
Buildings & Improvements		(642,237)
Total	[1]	701,436
Accumulated Depreciation	[2]	(165,384)
Net Cost Basis		536,052
Alexandria Center for Life Science - South San Francisco
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		32,245
Buildings & Improvements		1,287
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		493,804
Total Costs
Land		32,245
Buildings & Improvements		(495,091)
Total	[1]	527,336
Accumulated Depreciation	[2]	(196,343)
Net Cost Basis		330,993
Alexandria Center for Advanced Technologies - Tanforan
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		330,154
Buildings & Improvements		51,145
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		111,106
Total Costs
Land		330,154
Buildings & Improvements		(162,251)
Total	[1]	492,405
Accumulated Depreciation	[2]	(23,762)
Net Cost Basis		468,643
Alexandria Technology Center - Gateway
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		37,175
Buildings & Improvements		87,213
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		162,935
Total Costs
Land		37,175
Buildings & Improvements		(250,148)
Total	[1]	287,323
Accumulated Depreciation	[2]	(113,875)
Net Cost Basis		173,448
Alexandria Center for Life Science – Millbrae
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		69,989
Buildings & Improvements		0
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		526,673
Total Costs
Land		69,989
Buildings & Improvements		(526,673)
Total	[1]	596,662
Accumulated Depreciation	[2]	(11,190)
Net Cost Basis		585,472
500 Forbes Boulevard
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		35,596
Buildings & Improvements		69,091
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		23,757
Total Costs
Land		35,596
Buildings & Improvements		(92,848)
Total	[1]	128,444
Accumulated Depreciation	[2]	(40,504)
Net Cost Basis		87,940
Alexandria Center for Life Science - San Carlos
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		433,634
Buildings & Improvements		28,323
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		824,729
Total Costs
Land		433,634
Buildings & Improvements		(853,052)
Total	[1]	1,286,686
Accumulated Depreciation	[2]	(147,647)
Net Cost Basis		1,139,039
Alexandria Stanford Life Science District
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		0
Buildings & Improvements		599,401
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		119,819
Total Costs
Land		0
Buildings & Improvements		(719,220)
Total	[1]	719,220
Accumulated Depreciation	[2]	(222,457)
Net Cost Basis		496,763
3412, 3420, 3440, 3450, and 3460 Hillview Avenue
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		0
Buildings & Improvements		304,318
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		110,970
Total Costs
Land		0
Buildings & Improvements		(415,288)
Total	[1]	415,288
Accumulated Depreciation	[2]	(39,194)
Net Cost Basis		376,094
2475 and 2625/2627/2631 Hanover Street and 1450 Page Mill Road
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		0
Buildings & Improvements		187,472
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		33,658
Total Costs
Land		0
Buildings & Improvements		(221,130)
Total	[1]	221,130
Accumulated Depreciation	[2]	(44,011)
Net Cost Basis		177,119
Other - San Francisco
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		415,834
Buildings & Improvements		129,342
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		(134,119)
Total Costs
Land		415,834
Buildings & Improvements		(4,777)
Total	[1]	411,057
Accumulated Depreciation	[2]	(68,158)
Net Cost Basis		342,899
One Alexandria Square
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		140,318
Buildings & Improvements		161,293
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		1,097,503
Total Costs
Land		140,318
Buildings & Improvements		(1,258,796)
Total	[1]	1,399,114
Accumulated Depreciation	[2]	(337,901)
Net Cost Basis		1,061,213
ARE Torrey Ridge
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		22,124
Buildings & Improvements		152,840
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		115,518
Total Costs
Land		22,124
Buildings & Improvements		(268,358)
Total	[1]	290,482
Accumulated Depreciation	[2]	(90,324)
Net Cost Basis		200,158
One Alexandria North
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		103,937
Buildings & Improvements		1,354
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		56,248
Total Costs
Land		103,937
Buildings & Improvements		(57,602)
Total	[1]	161,539
Accumulated Depreciation	[2]	(1,359)
Net Cost Basis		160,180
Campus Point by Alexandria
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		270,937
Buildings & Improvements		416,534
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		991,360
Total Costs
Land		270,937
Buildings & Improvements		(1,407,894)
Total	[1]	1,678,831
Accumulated Depreciation	[2]	(318,859)
Net Cost Basis		1,359,972
5200 Illumina Way
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		39,051
Buildings & Improvements		96,606
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		201,334
Total Costs
Land		39,051
Buildings & Improvements		(297,940)
Total	[1]	336,991
Accumulated Depreciation	[2]	(98,479)
Net Cost Basis		238,512
9625 Towne Centre Drive
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		7,686
Buildings & Improvements		13,748
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		67,686
Total Costs
Land		7,686
Buildings & Improvements		(81,434)
Total	[1]	89,120
Accumulated Depreciation	[2]	(41,674)
Net Cost Basis		47,446
SD Tech by Alexandria
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		76,079
Buildings & Improvements		246,635
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		638,942
Total Costs
Land		76,079
Buildings & Improvements		(885,577)
Total	[1]	961,656
Accumulated Depreciation	[2]	(76,513)
Net Cost Basis		885,143
Sequence District by Alexandria
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		140,422
Buildings & Improvements		230,360
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		36,937
Total Costs
Land		140,422
Buildings & Improvements		(267,297)
Total	[1]	407,719
Accumulated Depreciation	[2]	(43,144)
Net Cost Basis		364,575
Summers Ridge Science Park
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		21,154
Buildings & Improvements		102,046
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		4,947
Total Costs
Land		21,154
Buildings & Improvements		(106,993)
Total	[1]	128,147
Accumulated Depreciation	[2]	(22,587)
Net Cost Basis		105,560
10102 Hoyt Park Drive
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		21,610
Buildings & Improvements		19,986
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		80,480
Total Costs
Land		21,610
Buildings & Improvements		(100,466)
Total	[1]	122,076
Accumulated Depreciation	[2]	(13,569)
Net Cost Basis		108,507
ARE Portola
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		6,991
Buildings & Improvements		25,153
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		30,633
Total Costs
Land		6,991
Buildings & Improvements		(55,786)
Total	[1]	62,777
Accumulated Depreciation	[2]	(30,232)
Net Cost Basis		32,545
5810/5820 Nancy Ridge Drive
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		3,492
Buildings & Improvements		18,285
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		33,910
Total Costs
Land		3,492
Buildings & Improvements		(52,195)
Total	[1]	55,687
Accumulated Depreciation	[2]	(30,347)
Net Cost Basis		25,340
9877 Waples Street
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		5,092
Buildings & Improvements		11,908
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		13,368
Total Costs
Land		5,092
Buildings & Improvements		(25,276)
Total	[1]	30,368
Accumulated Depreciation	[2]	(11,681)
Net Cost Basis		18,687
5871 Oberlin Drive
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		1,349
Buildings & Improvements		8,016
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		17,824
Total Costs
Land		1,349
Buildings & Improvements		(25,840)
Total	[1]	27,189
Accumulated Depreciation	[2]	(6,849)
Net Cost Basis		20,340
3911, 3931, 3985, 4025, 4031, 4045, and 4075 Sorrento Valley Boulevard
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		18,177
Buildings & Improvements		42,723
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		66,179
Total Costs
Land		18,177
Buildings & Improvements		(108,902)
Total	[1]	127,079
Accumulated Depreciation	[2]	(46,337)
Net Cost Basis		80,742
11045 Roselle Street
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		754
Buildings & Improvements		4,288
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		22,428
Total Costs
Land		754
Buildings & Improvements		(26,716)
Total	[1]	27,470
Accumulated Depreciation	[2]	(6,990)
Net Cost Basis		20,480
Other - San Diego
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		64,759
Buildings & Improvements		0
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		13,277
Total Costs
Land		64,759
Buildings & Improvements		(13,277)
Total	[1]	78,036
Accumulated Depreciation	[2]	(19)
Net Cost Basis		78,017
Alexandria Center for Life Science - Eastlake
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		46,300
Buildings & Improvements		83,012
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		946,515
Total Costs
Land		46,300
Buildings & Improvements		(1,029,527)
Total	[1]	1,075,827
Accumulated Depreciation	[2]	(316,598)
Net Cost Basis		759,229
Alexandria Center for Life Science - South Lake Union
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		245,778
Buildings & Improvements		31,252
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		616,442
Total Costs
Land		245,778
Buildings & Improvements		(647,694)
Total	[1]	893,472
Accumulated Depreciation	[2]	(81,716)
Net Cost Basis		811,756
1010 4th Avenue South
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		46,200
Buildings & Improvements		0
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		16,563
Total Costs
Land		46,200
Buildings & Improvements		(16,563)
Total	[1]	62,763
Accumulated Depreciation	[2]	0
Net Cost Basis		62,763
410 West Harrison/410 Elliott Avenue West
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		3,857
Buildings & Improvements		1,989
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		23,084
Total Costs
Land		3,857
Buildings & Improvements		(25,073)
Total	[1]	28,930
Accumulated Depreciation	[2]	(11,781)
Net Cost Basis		17,149
Alexandria Center for Advanced Technologies - Canyon Park
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		105,215
Buildings & Improvements		164,523
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		65,021
Total Costs
Land		105,215
Buildings & Improvements		(229,544)
Total	[1]	334,759
Accumulated Depreciation	[2]	(26,195)
Net Cost Basis		308,564
Alexandria Center for Advanced Technologies - Monte Villa Parkway
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		52,464
Buildings & Improvements		64,753
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		102,478
Total Costs
Land		52,464
Buildings & Improvements		(167,231)
Total	[1]	219,695
Accumulated Depreciation	[2]	(14,567)
Net Cost Basis		205,128
Other - Seattle
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		108,900
Buildings & Improvements		931
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		43,181
Total Costs
Land		108,900
Buildings & Improvements		(44,112)
Total	[1]	153,012
Accumulated Depreciation	[2]	(1,254)
Net Cost Basis		151,758
Alexandria Center for Life Science - Shady Grove
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		85,365
Buildings & Improvements		253,567
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		939,281
Total Costs
Land		85,365
Buildings & Improvements		(1,192,848)
Total	[1]	1,278,213
Accumulated Depreciation	[2]	(218,478)
Net Cost Basis		1,059,735
1330 Piccard Drive
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		2,800
Buildings & Improvements		11,533
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		38,733
Total Costs
Land		2,800
Buildings & Improvements		(50,266)
Total	[1]	53,066
Accumulated Depreciation	[2]	(28,216)
Net Cost Basis		24,850
1405 Research Boulevard
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		899
Buildings & Improvements		21,946
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		16,070
Total Costs
Land		899
Buildings & Improvements		(38,016)
Total	[1]	38,915
Accumulated Depreciation	[2]	(21,391)
Net Cost Basis		17,524
1500 and 1550 East Gude Drive
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		1,523
Buildings & Improvements		7,731
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		10,810
Total Costs
Land		1,523
Buildings & Improvements		(18,541)
Total	[1]	20,064
Accumulated Depreciation	[2]	(13,647)
Net Cost Basis		6,417
5 Research Place
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		1,466
Buildings & Improvements		5,708
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		32,319
Total Costs
Land		1,466
Buildings & Improvements		(38,027)
Total	[1]	39,493
Accumulated Depreciation	[2]	(21,812)
Net Cost Basis		17,681
5 Research Court
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		1,647
Buildings & Improvements		13,258
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		24,165
Total Costs
Land		1,647
Buildings & Improvements		(37,423)
Total	[1]	39,070
Accumulated Depreciation	[2]	(20,872)
Net Cost Basis		18,198
12301 Parklawn Drive
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		1,476
Buildings & Improvements		7,267
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		1,799
Total Costs
Land		1,476
Buildings & Improvements		(9,066)
Total	[1]	10,542
Accumulated Depreciation	[2]	(5,436)
Net Cost Basis		5,106
Alexandria Technology Center - Gaithersburg I
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		20,980
Buildings & Improvements		121,952
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		71,195
Total Costs
Land		20,980
Buildings & Improvements		(193,147)
Total	[1]	214,127
Accumulated Depreciation	[2]	(70,990)
Net Cost Basis		143,137
Alexandria Technology Center - Gaithersburg II
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		17,134
Buildings & Improvements		67,825
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		109,453
Total Costs
Land		17,134
Buildings & Improvements		(177,278)
Total	[1]	194,412
Accumulated Depreciation	[2]	(60,840)
Net Cost Basis		133,572
401 Professional Drive
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		1,129
Buildings & Improvements		6,941
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		12,511
Total Costs
Land		1,129
Buildings & Improvements		(19,452)
Total	[1]	20,581
Accumulated Depreciation	[2]	(11,054)
Net Cost Basis		9,527
950 Wind River Lane
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		2,400
Buildings & Improvements		10,620
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		1,592
Total Costs
Land		2,400
Buildings & Improvements		(12,212)
Total	[1]	14,612
Accumulated Depreciation	[2]	(5,020)
Net Cost Basis		9,592
620 Professional Drive
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		784
Buildings & Improvements		4,705
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		8,277
Total Costs
Land		784
Buildings & Improvements		(12,982)
Total	[1]	13,766
Accumulated Depreciation	[2]	(9,164)
Net Cost Basis		4,602
8000/9000/10000 Virginia Manor Road
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		0
Buildings & Improvements		13,679
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		11,036
Total Costs
Land		0
Buildings & Improvements		(24,715)
Total	[1]	24,715
Accumulated Depreciation	[2]	(15,264)
Net Cost Basis		9,451
Alexandria Center for Life Science - Durham
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		186,680
Buildings & Improvements		447,875
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		258,012
Total Costs
Land		186,680
Buildings & Improvements		(705,887)
Total	[1]	892,567
Accumulated Depreciation	[2]	(98,886)
Net Cost Basis		793,681
Alexandria Center for Advanced Technologies - Research Triangle
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		30,584
Buildings & Improvements		23,714
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		492,293
Total Costs
Land		30,584
Buildings & Improvements		(516,007)
Total	[1]	546,591
Accumulated Depreciation	[2]	(85,090)
Net Cost Basis		461,501
Alexandria Center for Sustainable Technologies
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		54,908
Buildings & Improvements		18,849
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		114,103
Total Costs
Land		54,908
Buildings & Improvements		(132,952)
Total	[1]	187,860
Accumulated Depreciation	[2]	(69,533)
Net Cost Basis		118,327
Alexandria Technology Center - Alston
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		577
Buildings & Improvements		11,688
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		26,513
Total Costs
Land		577
Buildings & Improvements		(38,201)
Total	[1]	38,778
Accumulated Depreciation	[2]	(23,906)
Net Cost Basis		14,872
Alexandria Innovation Center - Research Triangle
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		1,065
Buildings & Improvements		21,218
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		32,632
Total Costs
Land		1,065
Buildings & Improvements		(53,850)
Total	[1]	54,915
Accumulated Depreciation	[2]	(28,297)
Net Cost Basis		26,618
2525 East NC Highway 54
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		713
Buildings & Improvements		12,827
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		21,359
Total Costs
Land		713
Buildings & Improvements		(34,186)
Total	[1]	34,899
Accumulated Depreciation	[2]	(20,599)
Net Cost Basis		14,300
407 Davis Drive
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		1,229
Buildings & Improvements		17,733
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		13,949
Total Costs
Land		1,229
Buildings & Improvements		(31,682)
Total	[1]	32,911
Accumulated Depreciation	[2]	(7,851)
Net Cost Basis		25,060
Alexandria Center for Life Science - New York City
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		0
Buildings & Improvements		0
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		1,163,775
Total Costs
Land		0
Buildings & Improvements		(1,163,775)
Total	[1]	1,163,775
Accumulated Depreciation	[2]	(368,307)
Net Cost Basis		795,468
Intersection Campus
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		159,310
Buildings & Improvements		440,295
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		56,826
Total Costs
Land		159,310
Buildings & Improvements		(497,121)
Total	[1]	656,431
Accumulated Depreciation	[2]	(55,724)
Net Cost Basis		600,707
1020 Red River Street and 1001 Trinity Street
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		66,451
Buildings & Improvements		61,732
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		7,685
Total Costs
Land		66,451
Buildings & Improvements		(69,417)
Total	[1]	135,868
Accumulated Depreciation	[2]	(20,599)
Net Cost Basis		115,269
Alexandria Center for Advanced Technologies at The Woodlands
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		2,116
Buildings & Improvements		9,784
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		135,850
Total Costs
Land		2,116
Buildings & Improvements		(145,634)
Total	[1]	147,750
Accumulated Depreciation	[2]	(7,759)
Net Cost Basis		139,991
Other - Texas
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		44,217
Buildings & Improvements		0
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		16,024
Total Costs
Land		44,217
Buildings & Improvements		(16,024)
Total	[1]	60,241
Accumulated Depreciation	[2]	0
Net Cost Basis		60,241
Various
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation
Encumbrances		0
Initial Costs
Land		120,565
Buildings & Improvements		219,389
Costs Capitalized Subsequent to Acquisition
Buildings & Improvements		183,091
Total Costs
Land		120,565
Buildings & Improvements		(402,480)
Total	[1]	523,045
Accumulated Depreciation	[2]	(135,188)
Net Cost Basis		$ 387,857

[1] As of December 31, 2025, the total cost of our real estate assets aggregated $34.82 billion, which was less than the cost of real estate for federal income tax purposes aggregating $35.08 billion by approximately $266.6 million.

[2] The depreciable life is up to 40 years for buildings and building improvements, up to 20 years for land improvements, and the term of the respective lease for tenant improvements.