XML 146 R86.htm IDEA: XBRL DOCUMENT v3.24.4
Schedule III - Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation        
Encumbrances $ 149,908      
Initial Costs        
Land 7,815,474      
Buildings & Improvements 9,982,177      
Costs Capitalized Subsequent to Acquisition        
Buildings & Improvements 19,937,567      
Total Costs        
Land 7,815,474      
Buildings & Improvements 29,919,744      
Total 37,735,218 [1] $ 36,618,530 $ 34,299,503 $ 28,751,910
Accumulated Depreciation (5,625,179) [2] $ (4,985,019) $ (4,354,063) $ (3,771,241)
Net Cost Basis 32,110,039      
Investment in Real Estate, Federal Income Tax Basis 37,200,000      
Investment in real estate over cost basis of real estate for federal income tax purpose $ 489,400      
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 $ 149,908      
Initial Costs        
Land 7,815,474      
Buildings & Improvements 9,982,177      
Costs Capitalized Subsequent to Acquisition        
Buildings & Improvements 19,933,412      
Total Costs        
Land 7,815,474      
Buildings & Improvements 29,915,589      
Total [1] 37,731,063      
Accumulated Depreciation [2] (5,621,024)      
Net Cost Basis 32,110,039      
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 1,792,818      
Total Costs        
Land 558,885      
Buildings & Improvements 2,576,042      
Total [1] 3,134,927      
Accumulated Depreciation [2] (465,409)      
Net Cost Basis 2,669,518      
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 1,200,230      
Total Costs        
Land 405,164      
Buildings & Improvements 1,776,443      
Total [1] 2,181,607      
Accumulated Depreciation [2] (289,414)      
Net Cost Basis 1,892,193      
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 305,387      
Total Costs        
Land 0      
Buildings & Improvements 925,045      
Total [1] 925,045      
Accumulated Depreciation [2] (394,582)      
Net Cost Basis 530,463      
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 776,601      
Total Costs        
Land 191,797      
Buildings & Improvements 1,131,212      
Total [1] 1,323,009      
Accumulated Depreciation [2] (116,965)      
Net Cost Basis 1,206,044      
480 Arsenal Way and 446, 458, 500, and 550 Arsenal Way        
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation        
Encumbrances 149,321      
Initial Costs        
Land 164,658      
Buildings & Improvements 24,464      
Costs Capitalized Subsequent to Acquisition        
Buildings & Improvements 431,701      
Total Costs        
Land 164,658      
Buildings & Improvements 456,165      
Total [1] 620,823      
Accumulated Depreciation [2] (85,681)      
Net Cost Basis 535,142      
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 797,446      
Total Costs        
Land 912,016      
Buildings & Improvements 1,414,998      
Total [1] 2,327,014      
Accumulated Depreciation [2] (91,870)      
Net Cost Basis 2,235,144      
285, 299, 307, and 345 Dorchester Avenue        
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation        
Encumbrances 0      
Initial Costs        
Land 264,554      
Buildings & Improvements 0      
Costs Capitalized Subsequent to Acquisition        
Buildings & Improvements 22,917      
Total Costs        
Land 264,554      
Buildings & Improvements 22,917      
Total [1] 287,471      
Accumulated Depreciation [2] 0      
Net Cost Basis 287,471      
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 411,062      
Total Costs        
Land 277,554      
Buildings & Improvements 466,959      
Total [1] 744,513      
Accumulated Depreciation [2] (19,786)      
Net Cost Basis 724,727      
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 359,436      
Total Costs        
Land 141,629      
Buildings & Improvements 873,337      
Total [1] 1,014,966      
Accumulated Depreciation [2] (30,015)      
Net Cost Basis 984,951      
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 29,014      
Total Costs        
Land 32,136      
Buildings & Improvements 147,405      
Total [1] 179,541      
Accumulated Depreciation [2] (36,009)      
Net Cost Basis 143,532      
Other - Greater Boston        
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation        
Encumbrances 0      
Initial Costs        
Land 156,221      
Buildings & Improvements 187,205      
Costs Capitalized Subsequent to Acquisition        
Buildings & Improvements 89,097      
Total Costs        
Land 156,221      
Buildings & Improvements 276,302      
Total [1] 432,523      
Accumulated Depreciation [2] (5,331)      
Net Cost Basis 427,192      
Alexandria Center for Science and Technology - Mission Bay        
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation        
Encumbrances 0      
Initial Costs        
Land 213,014      
Buildings & Improvements 218,556      
Costs Capitalized Subsequent to Acquisition        
Buildings & Improvements 703,020      
Total Costs        
Land 213,014      
Buildings & Improvements 921,576      
Total [1] 1,134,590      
Accumulated Depreciation [2] (252,874)      
Net Cost Basis 881,716      
Alexandria Technology Center - Gateway        
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation        
Encumbrances 0      
Initial Costs        
Land 193,004      
Buildings & Improvements 364,078      
Costs Capitalized Subsequent to Acquisition        
Buildings & Improvements 763,530      
Total Costs        
Land 193,004      
Buildings & Improvements 1,127,608      
Total [1] 1,320,612      
Accumulated Depreciation [2] (209,196)      
Net Cost Basis 1,111,416      
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 490,449      
Total Costs        
Land 69,989      
Buildings & Improvements 490,449      
Total [1] 560,438      
Accumulated Depreciation [2] 0      
Net Cost Basis 560,438      
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 565,673      
Total Costs        
Land 59,199      
Buildings & Improvements 565,673      
Total [1] 624,872      
Accumulated Depreciation [2] (151,635)      
Net Cost Basis 473,237      
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 80,707      
Total Costs        
Land 330,154      
Buildings & Improvements 131,852      
Total [1] 462,006      
Accumulated Depreciation [2] (17,465)      
Net Cost Basis 444,541      
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 487,452      
Total Costs        
Land 32,245      
Buildings & Improvements 488,739      
Total [1] 520,984      
Accumulated Depreciation [2] (167,608)      
Net Cost Basis 353,376      
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 23,748      
Total Costs        
Land 35,596      
Buildings & Improvements 92,839      
Total [1] 128,435      
Accumulated Depreciation [2] (38,068)      
Net Cost Basis 90,367      
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 759,478      
Total Costs        
Land 433,634      
Buildings & Improvements 787,801      
Total [1] 1,221,435      
Accumulated Depreciation [2] (121,222)      
Net Cost Basis 1,100,213      
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 113,748      
Total Costs        
Land 0      
Buildings & Improvements 713,149      
Total [1] 713,149      
Accumulated Depreciation [2] (117,277)      
Net Cost Basis 595,872      
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 101,390      
Total Costs        
Land 0      
Buildings & Improvements 405,708      
Total [1] 405,708      
Accumulated Depreciation [2] (28,201)      
Net Cost Basis 377,507      
3825 and 3875 Fabian Way        
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation        
Encumbrances 0      
Initial Costs        
Land 194,424      
Buildings & Improvements 54,519      
Costs Capitalized Subsequent to Acquisition        
Buildings & Improvements 24,262      
Total Costs        
Land 194,424      
Buildings & Improvements 78,781      
Total [1] 273,205      
Accumulated Depreciation [2] (13,885)      
Net Cost Basis 259,320      
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 13,683      
Total Costs        
Land 0      
Buildings & Improvements 201,155      
Total [1] 201,155      
Accumulated Depreciation [2] (38,735)      
Net Cost Basis 162,420      
2100, 2200, 2300, and 2400 Geng Road        
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation        
Encumbrances 0      
Initial Costs        
Land 72,859      
Buildings & Improvements 53,309      
Costs Capitalized Subsequent to Acquisition        
Buildings & Improvements 42,129      
Total Costs        
Land 72,859      
Buildings & Improvements 95,438      
Total [1] 168,297      
Accumulated Depreciation [2] (23,335)      
Net Cost Basis 144,962      
3350 West Bayshore Road        
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation        
Encumbrances 0      
Initial Costs        
Land 4,800      
Buildings & Improvements 6,693      
Costs Capitalized Subsequent to Acquisition        
Buildings & Improvements 45,196      
Total Costs        
Land 4,800      
Buildings & Improvements 51,889      
Total [1] 56,689      
Accumulated Depreciation [2] (16,948)      
Net Cost Basis 39,741      
88 Bluxome Street        
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation        
Encumbrances 0      
Initial Costs        
Land 148,551      
Buildings & Improvements 21,514      
Costs Capitalized Subsequent to Acquisition        
Buildings & Improvements 227,887      
Total Costs        
Land 148,551      
Buildings & Improvements 249,401      
Total [1] 397,952      
Accumulated Depreciation [2] (23,098)      
Net Cost Basis 374,854      
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 948,146      
Total Costs        
Land 140,318      
Buildings & Improvements 1,109,439      
Total [1] 1,249,757      
Accumulated Depreciation [2] (274,785)      
Net Cost Basis 974,972      
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 109,164      
Total Costs        
Land 22,124      
Buildings & Improvements 262,004      
Total [1] 284,128      
Accumulated Depreciation [2] (80,763)      
Net Cost Basis 203,365      
ARE Nautilus        
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation        
Encumbrances 0      
Initial Costs        
Land 6,684      
Buildings & Improvements 27,600      
Costs Capitalized Subsequent to Acquisition        
Buildings & Improvements 142,569      
Total Costs        
Land 6,684      
Buildings & Improvements 170,169      
Total [1] 176,853      
Accumulated Depreciation [2] (77,155)      
Net Cost Basis 99,698      
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 49,172      
Total Costs        
Land 103,937      
Buildings & Improvements 50,526      
Total [1] 154,463      
Accumulated Depreciation [2] (1,359)      
Net Cost Basis 153,104      
Campus Point by Alexandria        
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation        
Encumbrances 0      
Initial Costs        
Land 119,760      
Buildings & Improvements 395,527      
Costs Capitalized Subsequent to Acquisition        
Buildings & Improvements 996,383      
Total Costs        
Land 119,760      
Buildings & Improvements 1,391,910      
Total [1] 1,511,670      
Accumulated Depreciation [2] (245,906)      
Net Cost Basis 1,265,764      
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 200,123      
Total Costs        
Land 39,051      
Buildings & Improvements 296,729      
Total [1] 335,780      
Accumulated Depreciation [2] (90,245)      
Net Cost Basis 245,535      
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 66,703      
Total Costs        
Land 7,686      
Buildings & Improvements 80,451      
Total [1] 88,137      
Accumulated Depreciation [2] (31,002)      
Net Cost Basis 57,135      
SD Tech by Alexandria        
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation        
Encumbrances 0      
Initial Costs        
Land 76,820      
Buildings & Improvements 248,969      
Costs Capitalized Subsequent to Acquisition        
Buildings & Improvements 532,373      
Total Costs        
Land 76,820      
Buildings & Improvements 781,342      
Total [1] 858,162      
Accumulated Depreciation [2] (57,256)      
Net Cost Basis 800,906      
Sequence District by Alexandria        
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation        
Encumbrances 0      
Initial Costs        
Land 163,610      
Buildings & Improvements 281,389      
Costs Capitalized Subsequent to Acquisition        
Buildings & Improvements 34,644      
Total Costs        
Land 163,610      
Buildings & Improvements 316,033      
Total [1] 479,643      
Accumulated Depreciation [2] (27,741)      
Net Cost Basis 451,902      
Pacific Technology Park        
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation        
Encumbrances 0      
Initial Costs        
Land 96,796      
Buildings & Improvements 66,660      
Costs Capitalized Subsequent to Acquisition        
Buildings & Improvements 5,033      
Total Costs        
Land 96,796      
Buildings & Improvements 71,693      
Total [1] 168,489      
Accumulated Depreciation [2] (5,889)      
Net Cost Basis 162,600      
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 4,816      
Total Costs        
Land 21,154      
Buildings & Improvements 106,862      
Total [1] 128,016      
Accumulated Depreciation [2] (19,699)      
Net Cost Basis 108,317      
Scripps Science Park by Alexandria        
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation        
Encumbrances 0      
Initial Costs        
Land 35,420      
Buildings & Improvements 43,767      
Costs Capitalized Subsequent to Acquisition        
Buildings & Improvements 85,252      
Total Costs        
Land 35,420      
Buildings & Improvements 129,019      
Total [1] 164,439      
Accumulated Depreciation [2] (9,419)      
Net Cost Basis 155,020      
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 41,671      
Total Costs        
Land 6,991      
Buildings & Improvements 66,824      
Total [1] 73,815      
Accumulated Depreciation [2] (27,649)      
Net Cost Basis 46,166      
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 33,648      
Total Costs        
Land 3,492      
Buildings & Improvements 51,933      
Total [1] 55,425      
Accumulated Depreciation [2] (22,090)      
Net Cost Basis 33,335      
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 13,289      
Total Costs        
Land 5,092      
Buildings & Improvements 25,197      
Total [1] 30,289      
Accumulated Depreciation [2] (10,990)      
Net Cost Basis 19,299      
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 20,610      
Total Costs        
Land 1,349      
Buildings & Improvements 28,626      
Total [1] 29,975      
Accumulated Depreciation [2] (6,058)      
Net Cost Basis 23,917      
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 44,918      
Total Costs        
Land 18,177      
Buildings & Improvements 87,641      
Total [1] 105,818      
Accumulated Depreciation [2] (44,128)      
Net Cost Basis 61,690      
11045 and 11055 Roselle Street        
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation        
Encumbrances 0      
Initial Costs        
Land 1,386      
Buildings & Improvements 4,288      
Costs Capitalized Subsequent to Acquisition        
Buildings & Improvements 34,110      
Total Costs        
Land 1,386      
Buildings & Improvements 38,398      
Total [1] 39,784      
Accumulated Depreciation [2] (12,572)      
Net Cost Basis 27,212      
Other - San Diego        
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation        
Encumbrances 0      
Initial Costs        
Land 104,027      
Buildings & Improvements 70,212      
Costs Capitalized Subsequent to Acquisition        
Buildings & Improvements 66,352      
Total Costs        
Land 104,027      
Buildings & Improvements 136,564      
Total [1] 240,591      
Accumulated Depreciation [2] (17,047)      
Net Cost Basis 223,544      
The Eastlake Life Science Campus by Alexandria        
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 933,691      
Total Costs        
Land 46,300      
Buildings & Improvements 1,016,703      
Total [1] 1,063,003      
Accumulated Depreciation [2] (267,005)      
Net Cost Basis 795,998      
Alexandria Center for Life Science - South Lake Union        
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation        
Encumbrances 0      
Initial Costs        
Land 243,959      
Buildings & Improvements 28,950      
Costs Capitalized Subsequent to Acquisition        
Buildings & Improvements 511,473      
Total Costs        
Land 243,959      
Buildings & Improvements 540,423      
Total [1] 784,382      
Accumulated Depreciation [2] (58,962)      
Net Cost Basis 725,420      
219 Terry Avenue North        
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation        
Encumbrances 0      
Initial Costs        
Land 1,819      
Buildings & Improvements 2,302      
Costs Capitalized Subsequent to Acquisition        
Buildings & Improvements 23,127      
Total Costs        
Land 1,819      
Buildings & Improvements 25,429      
Total [1] 27,248      
Accumulated Depreciation [2] (11,598)      
Net Cost Basis 15,650      
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 13,796      
Total Costs        
Land 46,200      
Buildings & Improvements 13,796      
Total [1] 59,996      
Accumulated Depreciation [2] 0      
Net Cost Basis 59,996      
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 20,788      
Total Costs        
Land 3,857      
Buildings & Improvements 22,777      
Total [1] 26,634      
Accumulated Depreciation [2] (11,367)      
Net Cost Basis 15,267      
Alexandria Center for Advanced Technologies - Canyon Park        
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation        
Encumbrances 0      
Initial Costs        
Land 133,558      
Buildings & Improvements 206,374      
Costs Capitalized Subsequent to Acquisition        
Buildings & Improvements 22,001      
Total Costs        
Land 133,558      
Buildings & Improvements 228,375      
Total [1] 361,933      
Accumulated Depreciation [2] (22,391)      
Net Cost Basis 339,542      
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 89,543      
Total Costs        
Land 52,464      
Buildings & Improvements 154,296      
Total [1] 206,760      
Accumulated Depreciation [2] (8,280)      
Net Cost Basis 198,480      
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 34,311      
Total Costs        
Land 108,900      
Buildings & Improvements 35,242      
Total [1] 144,142      
Accumulated Depreciation [2] (1,070)      
Net Cost Basis 143,072      
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 770,709      
Total Costs        
Land 85,365      
Buildings & Improvements 1,024,276      
Total [1] 1,109,641      
Accumulated Depreciation [2] (177,208)      
Net Cost Basis 932,433      
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 38,404      
Total Costs        
Land 2,800      
Buildings & Improvements 49,937      
Total [1] 52,737      
Accumulated Depreciation [2] (26,693)      
Net Cost Basis 26,044      
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 16,056      
Total Costs        
Land 899      
Buildings & Improvements 38,002      
Total [1] 38,901      
Accumulated Depreciation [2] (20,386)      
Net Cost Basis 18,515      
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 10,713      
Total Costs        
Land 1,523      
Buildings & Improvements 18,444      
Total [1] 19,967      
Accumulated Depreciation [2] (12,754)      
Net Cost Basis 7,213      
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 31,457      
Total Costs        
Land 1,466      
Buildings & Improvements 37,165      
Total [1] 38,631      
Accumulated Depreciation [2] (20,626)      
Net Cost Basis 18,005      
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 24,152      
Total Costs        
Land 1,647      
Buildings & Improvements 37,410      
Total [1] 39,057      
Accumulated Depreciation [2] (19,916)      
Net Cost Basis 19,141      
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 1,741      
Total Costs        
Land 1,476      
Buildings & Improvements 9,008      
Total [1] 10,484      
Accumulated Depreciation [2] (4,767)      
Net Cost Basis 5,717      
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 63,723      
Total Costs        
Land 20,980      
Buildings & Improvements 185,675      
Total [1] 206,655      
Accumulated Depreciation [2] (65,594)      
Net Cost Basis 141,061      
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 110,446      
Total Costs        
Land 17,134      
Buildings & Improvements 178,271      
Total [1] 195,405      
Accumulated Depreciation [2] (54,029)      
Net Cost Basis 141,376      
20400 Century Boulevard        
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation        
Encumbrances 0      
Initial Costs        
Land 3,641      
Buildings & Improvements 4,759      
Costs Capitalized Subsequent to Acquisition        
Buildings & Improvements 26,600      
Total Costs        
Land 3,641      
Buildings & Improvements 31,359      
Total [1] 35,000      
Accumulated Depreciation [2] (6,400)      
Net Cost Basis 28,600      
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 12,234      
Total Costs        
Land 1,129      
Buildings & Improvements 19,175      
Total [1] 20,304      
Accumulated Depreciation [2] (10,506)      
Net Cost Basis 9,798      
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 1,602      
Total Costs        
Land 2,400      
Buildings & Improvements 12,222      
Total [1] 14,622      
Accumulated Depreciation [2] (4,746)      
Net Cost Basis 9,876      
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 8,271      
Total Costs        
Land 784      
Buildings & Improvements 12,976      
Total [1] 13,760      
Accumulated Depreciation [2] (8,847)      
Net Cost Basis 4,913      
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 12,054      
Total Costs        
Land 0      
Buildings & Improvements 25,733      
Total [1] 25,733      
Accumulated Depreciation [2] (14,302)      
Net Cost Basis 11,431      
Alexandria Center for Life Science - Durham        
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation        
Encumbrances 0      
Initial Costs        
Land 190,236      
Buildings & Improvements 471,263      
Costs Capitalized Subsequent to Acquisition        
Buildings & Improvements 290,512      
Total Costs        
Land 190,236      
Buildings & Improvements 761,775      
Total [1] 952,011      
Accumulated Depreciation [2] (77,489)      
Net Cost Basis 874,522      
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 480,461      
Total Costs        
Land 30,584      
Buildings & Improvements 504,175      
Total [1] 534,759      
Accumulated Depreciation [2] (66,898)      
Net Cost Basis 467,861      
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 140,271      
Total Costs        
Land 54,908      
Buildings & Improvements 159,120      
Total [1] 214,028      
Accumulated Depreciation [2] (66,435)      
Net Cost Basis 147,593      
Alexandria Technology Center - Alston        
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation        
Encumbrances 0      
Initial Costs        
Land 1,430      
Buildings & Improvements 17,482      
Costs Capitalized Subsequent to Acquisition        
Buildings & Improvements 35,264      
Total Costs        
Land 1,430      
Buildings & Improvements 52,746      
Total [1] 54,176      
Accumulated Depreciation [2] (30,051)      
Net Cost Basis 24,125      
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 32,335      
Total Costs        
Land 1,065      
Buildings & Improvements 53,553      
Total [1] 54,618      
Accumulated Depreciation [2] (26,865)      
Net Cost Basis 27,753      
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 21,217      
Total Costs        
Land 713      
Buildings & Improvements 34,044      
Total [1] 34,757      
Accumulated Depreciation [2] (18,986)      
Net Cost Basis 15,771      
6101 Quadrangle 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 13,746      
Total Costs        
Land 1,229      
Buildings & Improvements 31,479      
Total [1] 32,708      
Accumulated Depreciation [2] (6,323)      
Net Cost Basis 26,385      
601 Keystone Park Drive        
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation        
Encumbrances 0      
Initial Costs        
Land 785      
Buildings & Improvements 11,546      
Costs Capitalized Subsequent to Acquisition        
Buildings & Improvements 16,517      
Total Costs        
Land 785      
Buildings & Improvements 28,063      
Total [1] 28,848      
Accumulated Depreciation [2] (10,183)      
Net Cost Basis 18,665      
Alexandria Center for NextGen Medicines        
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation        
Encumbrances 0      
Initial Costs        
Land 94,184      
Buildings & Improvements 0      
Costs Capitalized Subsequent to Acquisition        
Buildings & Improvements 15,184      
Total Costs        
Land 94,184      
Buildings & Improvements 15,184      
Total [1] 109,368      
Accumulated Depreciation [2] 0      
Net Cost Basis 109,368      
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 1,145,948      
Total Costs        
Land 0      
Buildings & Improvements 1,145,948      
Total [1] 1,145,948      
Accumulated Depreciation [2] (328,535)      
Net Cost Basis 817,413      
Alexandria Center for Life Science - Long Island City        
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation        
Encumbrances 0      
Initial Costs        
Land 22,746      
Buildings & Improvements 53,093      
Costs Capitalized Subsequent to Acquisition        
Buildings & Improvements 165,179      
Total Costs        
Land 22,746      
Buildings & Improvements 218,272      
Total [1] 241,018      
Accumulated Depreciation [2] (11,817)      
Net Cost Basis 229,201      
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 45,603      
Total Costs        
Land 159,310      
Buildings & Improvements 485,898      
Total [1] 645,208      
Accumulated Depreciation [2] (38,942)      
Net Cost Basis 606,266      
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 2,964      
Total Costs        
Land 66,451      
Buildings & Improvements 64,696      
Total [1] 131,147      
Accumulated Depreciation [2] (20,008)      
Net Cost Basis 111,139      
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 133,579      
Total Costs        
Land 2,116      
Buildings & Improvements 143,363      
Total [1] 145,479      
Accumulated Depreciation [2] (3,199)      
Net Cost Basis 142,280      
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 12,580      
Total Costs        
Land 44,217      
Buildings & Improvements 12,580      
Total [1] 56,797      
Accumulated Depreciation [2] 0      
Net Cost Basis 56,797      
Canada        
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation        
Encumbrances 0      
Initial Costs        
Land 75,225      
Buildings & Improvements 163,161      
Costs Capitalized Subsequent to Acquisition        
Buildings & Improvements 114,376      
Total Costs        
Land 75,225      
Buildings & Improvements 277,537      
Total [1] 352,762      
Accumulated Depreciation [2] (31,304)      
Net Cost Basis 321,458      
Various        
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation        
Encumbrances 587      
Initial Costs        
Land 426,017      
Buildings & Improvements 136,472      
Costs Capitalized Subsequent to Acquisition        
Buildings & Improvements 403,747      
Total Costs        
Land 426,017      
Buildings & Improvements 540,219      
Total [1] 966,236      
Accumulated Depreciation [2] (240,180)      
Net Cost Basis 726,056      
China        
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 4,155      
Total Costs        
Land 0      
Buildings & Improvements 4,155      
Total [1] 4,155      
Accumulated Depreciation [2] (4,155)      
Net Cost Basis $ 0      
[1] As of December 31, 2024, the total cost of our real estate assets aggregated $37.7 billion, which exceeded the cost of real estate for federal income tax purposes aggregating $37.2 billion by approximately $489.4 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.