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Schedule III - Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation (Details) - USD ($) | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | $ 119,661,000 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 7,875,488,000 |  |  |  |
Buildings & Improvements |  | 10,606,121,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 18,136,921,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 7,875,488,000 |  |  |  |
Buildings & Improvements |  | 28,743,042,000 |  |  |  |
Total |  | 36,618,530,000 | [1] | $ 34,299,503,000 | $ 28,751,910,000 | $ 21,274,810,000
Accumulated Depreciation |  | (4,985,019,000) | [2] | $ (4,354,063,000) | $ (3,771,241,000) | $ (3,182,438,000)
Net Cost Basis |  | 31,633,511,000 |  |  |  |
Investment in Real Estate, Federal Income Tax Basis |  | 36,100,000,000 |  |  |  |
Investment in real estate over cost basis of real estate for federal income tax purpose |  | $ 483,200,000 |  |  |  |
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 |  | $ 119,661,000 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 7,875,488,000 |  |  |  |
Buildings & Improvements |  | 10,606,121,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 18,132,709,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 7,875,488,000 |  |  |  |
Buildings & Improvements |  | 28,738,830,000 |  |  |  |
Total | [1] | 36,614,318,000 |  |  |  |
Accumulated Depreciation | [2] | (4,980,807,000) |  |  |  |
Net Cost Basis |  | 31,633,511,000 |  |  |  |
Alexandria Center at Kendall Square |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 600,178,000 |  |  |  |
Buildings & Improvements |  | 926,555,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 1,947,990,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 600,178,000 |  |  |  |
Buildings & Improvements |  | 2,874,545,000 |  |  |  |
Total | [1] | 3,474,723,000 |  |  |  |
Accumulated Depreciation | [2] | (503,555,000) |  |  |  |
Net Cost Basis |  | 2,971,168,000 |  |  |  |
Alexandria Center at One Kendall Square |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 405,164,000 |  |  |  |
Buildings & Improvements |  | 576,213,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 1,104,541,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 405,164,000 |  |  |  |
Buildings & Improvements |  | 1,680,754,000 |  |  |  |
Total | [1] | 2,085,918,000 |  |  |  |
Accumulated Depreciation | [2] | (223,051,000) |  |  |  |
Net Cost Basis |  | 1,862,867,000 |  |  |  |
Alexandria Technology Square |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 0 |  |  |  |
Buildings & Improvements |  | 619,658,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 294,655,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 0 |  |  |  |
Buildings & Improvements |  | 914,313,000 |  |  |  |
Total | [1] | 914,313,000 |  |  |  |
Accumulated Depreciation | [2] | (365,871,000) |  |  |  |
Net Cost Basis |  | 548,442,000 |  |  |  |
The Arsenal on the Charles |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 191,797,000 |  |  |  |
Buildings & Improvements |  | 354,611,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 651,853,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 191,797,000 |  |  |  |
Buildings & Improvements |  | 1,006,464,000 |  |  |  |
Total | [1] | 1,198,261,000 |  |  |  |
Accumulated Depreciation | [2] | (75,217,000) |  |  |  |
Net Cost Basis |  | 1,123,044,000 |  |  |  |
480 Arsenal Way and 446, 458, 500, and 550 Arsenal Way |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 121,533,000 |  |  |  |
Buildings & Improvements |  | 24,464,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 133,339,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 121,533,000 |  |  |  |
Buildings & Improvements |  | 157,803,000 |  |  |  |
Total | [1] | 279,336,000 |  |  |  |
Accumulated Depreciation | [2] | (70,773,000) |  |  |  |
Net Cost Basis |  | 208,563,000 |  |  |  |
99 Coolidge Avenue |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 119,042,000 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 43,125,000 |  |  |  |
Buildings & Improvements |  | 0 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 248,830,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 43,125,000 |  |  |  |
Buildings & Improvements |  | 248,830,000 |  |  |  |
Total | [1] | 291,955,000 |  |  |  |
Accumulated Depreciation | [2] | (6,000) |  |  |  |
Net Cost Basis |  | 291,949,000 |  |  |  |
Alexandria Center for Life Science - Fenway |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 912,016,000 |  |  |  |
Buildings & Improvements |  | 617,552,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 534,106,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 912,016,000 |  |  |  |
Buildings & Improvements |  | 1,151,658,000 |  |  |  |
Total | [1] | 2,063,674,000 |  |  |  |
Accumulated Depreciation | [2] | (58,969,000) |  |  |  |
Net Cost Basis |  | 2,004,705,000 |  |  |  |
5, 10, and 15 Necco Street |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 277,554,000 |  |  |  |
Buildings & Improvements |  | 55,897,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 356,438,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 277,554,000 |  |  |  |
Buildings & Improvements |  | 412,335,000 |  |  |  |
Total | [1] | 689,889,000 |  |  |  |
Accumulated Depreciation | [2] | (7,416,000) |  |  |  |
Net Cost Basis |  | 682,473,000 |  |  |  |
One Moderna Way |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 67,329,000 |  |  |  |
Buildings & Improvements |  | 301,000,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 54,546,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 67,329,000 |  |  |  |
Buildings & Improvements |  | 355,546,000 |  |  |  |
Total | [1] | 422,875,000 |  |  |  |
Accumulated Depreciation | [2] | (32,696,000) |  |  |  |
Net Cost Basis |  | 390,179,000 |  |  |  |
Alexandria Center for Life Science - Waltham |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 141,629,000 |  |  |  |
Buildings & Improvements |  | 513,901,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 242,869,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 141,629,000 |  |  |  |
Buildings & Improvements |  | 756,770,000 |  |  |  |
Total | [1] | 898,399,000 |  |  |  |
Accumulated Depreciation | [2] | (21,848,000) |  |  |  |
Net Cost Basis |  | 876,551,000 |  |  |  |
19, 215, 225, and 235 Presidential Way |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 32,136,000 |  |  |  |
Buildings & Improvements |  | 118,391,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 27,603,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 32,136,000 |  |  |  |
Buildings & Improvements |  | 145,994,000 |  |  |  |
Total | [1] | 178,130,000 |  |  |  |
Accumulated Depreciation | [2] | (32,179,000) |  |  |  |
Net Cost Basis |  | 145,951,000 |  |  |  |
Other - Greater Boston |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 171,265,000 |  |  |  |
Buildings & Improvements |  | 208,319,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 70,844,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 171,265,000 |  |  |  |
Buildings & Improvements |  | 279,163,000 |  |  |  |
Total | [1] | 450,428,000 |  |  |  |
Accumulated Depreciation | [2] | (4,744,000) |  |  |  |
Net Cost Basis |  | 445,684,000 |  |  |  |
Alexandria Center for Science and Technology - Mission Bay |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 213,014,000 |  |  |  |
Buildings & Improvements |  | 218,556,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 668,907,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 213,014,000 |  |  |  |
Buildings & Improvements |  | 887,463,000 |  |  |  |
Total | [1] | 1,100,477,000 |  |  |  |
Accumulated Depreciation | [2] | (233,274,000) |  |  |  |
Net Cost Basis |  | 867,203,000 |  |  |  |
Alexandria Technology Center - Gateway |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 193,004,000 |  |  |  |
Buildings & Improvements |  | 364,078,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 702,904,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 193,004,000 |  |  |  |
Buildings & Improvements |  | 1,066,982,000 |  |  |  |
Total | [1] | 1,259,986,000 |  |  |  |
Accumulated Depreciation | [2] | (171,828,000) |  |  |  |
Net Cost Basis |  | 1,088,158,000 |  |  |  |
Alexandria Center for Life Science – Millbrae |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 69,989,000 |  |  |  |
Buildings & Improvements |  | 0 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 311,759,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 69,989,000 |  |  |  |
Buildings & Improvements |  | 311,759,000 |  |  |  |
Total | [1] | 381,748,000 |  |  |  |
Accumulated Depreciation | [2] | 0 |  |  |  |
Net Cost Basis |  | 381,748,000 |  |  |  |
Alexandria Center for Advanced Technologies - South San Francisco |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 59,199,000 |  |  |  |
Buildings & Improvements |  | 0 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 546,295,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 59,199,000 |  |  |  |
Buildings & Improvements |  | 546,295,000 |  |  |  |
Total | [1] | 605,494,000 |  |  |  |
Accumulated Depreciation | [2] | (135,948,000) |  |  |  |
Net Cost Basis |  | 469,546,000 |  |  |  |
Alexandria Center for Advanced Technologies - Tanforan |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 330,154,000 |  |  |  |
Buildings & Improvements |  | 51,145,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 51,161,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 330,154,000 |  |  |  |
Buildings & Improvements |  | 102,306,000 |  |  |  |
Total | [1] | 432,460,000 |  |  |  |
Accumulated Depreciation | [2] | (11,051,000) |  |  |  |
Net Cost Basis |  | 421,409,000 |  |  |  |
Alexandria Center for Life Science - South San Francisco |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 32,245,000 |  |  |  |
Buildings & Improvements |  | 1,287,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 480,347,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 32,245,000 |  |  |  |
Buildings & Improvements |  | 481,634,000 |  |  |  |
Total | [1] | 513,879,000 |  |  |  |
Accumulated Depreciation | [2] | (139,392,000) |  |  |  |
Net Cost Basis |  | 374,487,000 |  |  |  |
500 Forbes Boulevard |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 35,596,000 |  |  |  |
Buildings & Improvements |  | 69,091,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 22,148,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 35,596,000 |  |  |  |
Buildings & Improvements |  | 91,239,000 |  |  |  |
Total | [1] | 126,835,000 |  |  |  |
Accumulated Depreciation | [2] | (35,880,000) |  |  |  |
Net Cost Basis |  | 90,955,000 |  |  |  |
Alexandria Center for Life Science - San Carlos |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 433,634,000 |  |  |  |
Buildings & Improvements |  | 28,323,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 717,671,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 433,634,000 |  |  |  |
Buildings & Improvements |  | 745,994,000 |  |  |  |
Total | [1] | 1,179,628,000 |  |  |  |
Accumulated Depreciation | [2] | (86,306,000) |  |  |  |
Net Cost Basis |  | 1,093,322,000 |  |  |  |
3825 and 3875 Fabian Way |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 194,424,000 |  |  |  |
Buildings & Improvements |  | 54,519,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 14,737,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 194,424,000 |  |  |  |
Buildings & Improvements |  | 69,256,000 |  |  |  |
Total | [1] | 263,680,000 |  |  |  |
Accumulated Depreciation | [2] | (11,583,000) |  |  |  |
Net Cost Basis |  | 252,097,000 |  |  |  |
Alexandria Stanford Life Science District |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 0 |  |  |  |
Buildings & Improvements |  | 599,401,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 115,138,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 0 |  |  |  |
Buildings & Improvements |  | 714,539,000 |  |  |  |
Total | [1] | 714,539,000 |  |  |  |
Accumulated Depreciation | [2] | (62,305,000) |  |  |  |
Net Cost Basis |  | 652,234,000 |  |  |  |
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 |  | 304,318,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 88,966,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 0 |  |  |  |
Buildings & Improvements |  | 393,284,000 |  |  |  |
Total | [1] | 393,284,000 |  |  |  |
Accumulated Depreciation | [2] | (19,647,000) |  |  |  |
Net Cost Basis |  | 373,637,000 |  |  |  |
2100, 2200, 2300, and 2400 Geng Road |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 72,859,000 |  |  |  |
Buildings & Improvements |  | 53,309,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 35,856,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 72,859,000 |  |  |  |
Buildings & Improvements |  | 89,165,000 |  |  |  |
Total | [1] | 162,024,000 |  |  |  |
Accumulated Depreciation | [2] | (19,554,000) |  |  |  |
Net Cost Basis |  | 142,470,000 |  |  |  |
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 |  | 187,472,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 12,988,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 0 |  |  |  |
Buildings & Improvements |  | 200,460,000 |  |  |  |
Total | [1] | 200,460,000 |  |  |  |
Accumulated Depreciation | [2] | (33,645,000) |  |  |  |
Net Cost Basis |  | 166,815,000 |  |  |  |
2425 Garcia Avenue & 2450 Bayshore Parkway |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 619,000 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 1,512,000 |  |  |  |
Buildings & Improvements |  | 21,323,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 26,281,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 1,512,000 |  |  |  |
Buildings & Improvements |  | 47,604,000 |  |  |  |
Total | [1] | 49,116,000 |  |  |  |
Accumulated Depreciation | [2] | (27,833,000) |  |  |  |
Net Cost Basis |  | 21,283,000 |  |  |  |
3350 West Bayshore Road |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 4,800,000 |  |  |  |
Buildings & Improvements |  | 6,693,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 45,079,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 4,800,000 |  |  |  |
Buildings & Improvements |  | 51,772,000 |  |  |  |
Total | [1] | 56,572,000 |  |  |  |
Accumulated Depreciation | [2] | (13,221,000) |  |  |  |
Net Cost Basis |  | 43,351,000 |  |  |  |
901 California Avenue |  |  |  |  |  |
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 |  | 16,419,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 0 |  |  |  |
Buildings & Improvements |  | 16,419,000 |  |  |  |
Total | [1] | 16,419,000 |  |  |  |
Accumulated Depreciation | [2] | 0 |  |  |  |
Net Cost Basis |  | 16,419,000 |  |  |  |
88 Bluxome Street |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 148,551,000 |  |  |  |
Buildings & Improvements |  | 21,514,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 208,770,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 148,551,000 |  |  |  |
Buildings & Improvements |  | 230,284,000 |  |  |  |
Total | [1] | 378,835,000 |  |  |  |
Accumulated Depreciation | [2] | (23,098,000) |  |  |  |
Net Cost Basis |  | 355,737,000 |  |  |  |
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 |  | 1,102,566,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 0 |  |  |  |
Buildings & Improvements |  | 1,102,566,000 |  |  |  |
Total | [1] | 1,102,566,000 |  |  |  |
Accumulated Depreciation | [2] | (294,190,000) |  |  |  |
Net Cost Basis |  | 808,376,000 |  |  |  |
Alexandria Center for Life Science - Long Island City |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 22,746,000 |  |  |  |
Buildings & Improvements |  | 53,093,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 158,719,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 22,746,000 |  |  |  |
Buildings & Improvements |  | 211,812,000 |  |  |  |
Total | [1] | 234,558,000 |  |  |  |
Accumulated Depreciation | [2] | (7,486,000) |  |  |  |
Net Cost Basis |  | 227,072,000 |  |  |  |
One Alexandria Square |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 139,608,000 |  |  |  |
Buildings & Improvements |  | 161,293,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 673,079,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 139,608,000 |  |  |  |
Buildings & Improvements |  | 834,372,000 |  |  |  |
Total | [1] | 973,980,000 |  |  |  |
Accumulated Depreciation | [2] | (236,264,000) |  |  |  |
Net Cost Basis |  | 737,716,000 |  |  |  |
One Alexandria North |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 103,937,000 |  |  |  |
Buildings & Improvements |  | 1,354,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 37,971,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 103,937,000 |  |  |  |
Buildings & Improvements |  | 39,325,000 |  |  |  |
Total | [1] | 143,262,000 |  |  |  |
Accumulated Depreciation | [2] | (1,359,000) |  |  |  |
Net Cost Basis |  | 141,903,000 |  |  |  |
ARE Torrey Ridge |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 22,124,000 |  |  |  |
Buildings & Improvements |  | 152,840,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 85,391,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 22,124,000 |  |  |  |
Buildings & Improvements |  | 238,231,000 |  |  |  |
Total | [1] | 260,355,000 |  |  |  |
Accumulated Depreciation | [2] | (71,018,000) |  |  |  |
Net Cost Basis |  | 189,337,000 |  |  |  |
ARE Nautilus |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 6,684,000 |  |  |  |
Buildings & Improvements |  | 27,600,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 134,110,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 6,684,000 |  |  |  |
Buildings & Improvements |  | 161,710,000 |  |  |  |
Total | [1] | 168,394,000 |  |  |  |
Accumulated Depreciation | [2] | (70,628,000) |  |  |  |
Net Cost Basis |  | 97,766,000 |  |  |  |
Campus Point by Alexandria |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 200,556,000 |  |  |  |
Buildings & Improvements |  | 396,739,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 703,166,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 200,556,000 |  |  |  |
Buildings & Improvements |  | 1,099,905,000 |  |  |  |
Total | [1] | 1,300,461,000 |  |  |  |
Accumulated Depreciation | [2] | (218,886,000) |  |  |  |
Net Cost Basis |  | 1,081,575,000 |  |  |  |
5200 Illumina Way |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 39,051,000 |  |  |  |
Buildings & Improvements |  | 96,606,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 200,141,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 39,051,000 |  |  |  |
Buildings & Improvements |  | 296,747,000 |  |  |  |
Total | [1] | 335,798,000 |  |  |  |
Accumulated Depreciation | [2] | (81,880,000) |  |  |  |
Net Cost Basis |  | 253,918,000 |  |  |  |
ARE Esplanade |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 9,682,000 |  |  |  |
Buildings & Improvements |  | 29,991,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 117,777,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 9,682,000 |  |  |  |
Buildings & Improvements |  | 147,768,000 |  |  |  |
Total | [1] | 157,450,000 |  |  |  |
Accumulated Depreciation | [2] | (54,787,000) |  |  |  |
Net Cost Basis |  | 102,663,000 |  |  |  |
ARE Towne Centre |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 853,000 |  |  |  |
Buildings & Improvements |  | 5,101,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 60,536,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 853,000 |  |  |  |
Buildings & Improvements |  | 65,637,000 |  |  |  |
Total | [1] | 66,490,000 |  |  |  |
Accumulated Depreciation | [2] | (48,747,000) |  |  |  |
Net Cost Basis |  | 17,743,000 |  |  |  |
9625 Towne Centre Drive |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 7,686,000 |  |  |  |
Buildings & Improvements |  | 14,586,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 65,762,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 7,686,000 |  |  |  |
Buildings & Improvements |  | 80,348,000 |  |  |  |
Total | [1] | 88,034,000 |  |  |  |
Accumulated Depreciation | [2] | (22,945,000) |  |  |  |
Net Cost Basis |  | 65,089,000 |  |  |  |
Costa Verde By Alexandria |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 124,070,000 |  |  |  |
Buildings & Improvements |  | 0 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 26,487,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 124,070,000 |  |  |  |
Buildings & Improvements |  | 26,487,000 |  |  |  |
Total | [1] | 150,557,000 |  |  |  |
Accumulated Depreciation | [2] | (476,000) |  |  |  |
Net Cost Basis |  | 150,081,000 |  |  |  |
SD Tech by Alexandria |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 81,428,000 |  |  |  |
Buildings & Improvements |  | 254,069,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 438,643,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 81,428,000 |  |  |  |
Buildings & Improvements |  | 692,712,000 |  |  |  |
Total | [1] | 774,140,000 |  |  |  |
Accumulated Depreciation | [2] | (47,000,000) |  |  |  |
Net Cost Basis |  | 727,140,000 |  |  |  |
Sequence District by Alexandria |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 163,610,000 |  |  |  |
Buildings & Improvements |  | 281,389,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 30,101,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 163,610,000 |  |  |  |
Buildings & Improvements |  | 311,490,000 |  |  |  |
Total | [1] | 475,100,000 |  |  |  |
Accumulated Depreciation | [2] | (19,262,000) |  |  |  |
Net Cost Basis |  | 455,838,000 |  |  |  |
Pacific Technology Park |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 96,796,000 |  |  |  |
Buildings & Improvements |  | 66,660,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 27,088,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 96,796,000 |  |  |  |
Buildings & Improvements |  | 93,748,000 |  |  |  |
Total | [1] | 190,544,000 |  |  |  |
Accumulated Depreciation | [2] | (5,903,000) |  |  |  |
Net Cost Basis |  | 184,641,000 |  |  |  |
Summers Ridge Science Park |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 21,154,000 |  |  |  |
Buildings & Improvements |  | 102,046,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 4,782,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 21,154,000 |  |  |  |
Buildings & Improvements |  | 106,828,000 |  |  |  |
Total | [1] | 127,982,000 |  |  |  |
Accumulated Depreciation | [2] | (16,796,000) |  |  |  |
Net Cost Basis |  | 111,186,000 |  |  |  |
Scripps Science Park by Alexandria |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 79,451,000 |  |  |  |
Buildings & Improvements |  | 59,343,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 98,047,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 79,451,000 |  |  |  |
Buildings & Improvements |  | 157,390,000 |  |  |  |
Total | [1] | 236,841,000 |  |  |  |
Accumulated Depreciation | [2] | (4,557,000) |  |  |  |
Net Cost Basis |  | 232,284,000 |  |  |  |
ARE Portola |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 6,991,000 |  |  |  |
Buildings & Improvements |  | 25,153,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 41,147,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 6,991,000 |  |  |  |
Buildings & Improvements |  | 66,300,000 |  |  |  |
Total | [1] | 73,291,000 |  |  |  |
Accumulated Depreciation | [2] | (24,464,000) |  |  |  |
Net Cost Basis |  | 48,827,000 |  |  |  |
5810/5820 Nancy Ridge Drive |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 3,492,000 |  |  |  |
Buildings & Improvements |  | 18,285,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 33,468,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 3,492,000 |  |  |  |
Buildings & Improvements |  | 51,753,000 |  |  |  |
Total | [1] | 55,245,000 |  |  |  |
Accumulated Depreciation | [2] | (16,763,000) |  |  |  |
Net Cost Basis |  | 38,482,000 |  |  |  |
9877 Waples Street |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 5,092,000 |  |  |  |
Buildings & Improvements |  | 11,908,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 13,289,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 5,092,000 |  |  |  |
Buildings & Improvements |  | 25,197,000 |  |  |  |
Total | [1] | 30,289,000 |  |  |  |
Accumulated Depreciation | [2] | (4,101,000) |  |  |  |
Net Cost Basis |  | 26,188,000 |  |  |  |
5871 Oberlin Drive |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 1,349,000 |  |  |  |
Buildings & Improvements |  | 8,016,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 20,511,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 1,349,000 |  |  |  |
Buildings & Improvements |  | 28,527,000 |  |  |  |
Total | [1] | 29,876,000 |  |  |  |
Accumulated Depreciation | [2] | (5,174,000) |  |  |  |
Net Cost Basis |  | 24,702,000 |  |  |  |
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 |  | 18,177,000 |  |  |  |
Buildings & Improvements |  | 42,723,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 38,176,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 18,177,000 |  |  |  |
Buildings & Improvements |  | 80,899,000 |  |  |  |
Total | [1] | 99,076,000 |  |  |  |
Accumulated Depreciation | [2] | (42,904,000) |  |  |  |
Net Cost Basis |  | 56,172,000 |  |  |  |
11045 and 11055 Roselle Street |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 1,386,000 |  |  |  |
Buildings & Improvements |  | 4,288,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 33,803,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 1,386,000 |  |  |  |
Buildings & Improvements |  | 38,091,000 |  |  |  |
Total | [1] | 39,477,000 |  |  |  |
Accumulated Depreciation | [2] | (10,414,000) |  |  |  |
Net Cost Basis |  | 29,063,000 |  |  |  |
Other - San Diego |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 104,737,000 |  |  |  |
Buildings & Improvements |  | 70,212,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 65,226,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 104,737,000 |  |  |  |
Buildings & Improvements |  | 135,438,000 |  |  |  |
Total | [1] | 240,175,000 |  |  |  |
Accumulated Depreciation | [2] | (15,492,000) |  |  |  |
Net Cost Basis |  | 224,683,000 |  |  |  |
The Eastlake Life Science Campus by Alexandria |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 47,230,000 |  |  |  |
Buildings & Improvements |  | 83,012,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 1,017,765,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 47,230,000 |  |  |  |
Buildings & Improvements |  | 1,100,777,000 |  |  |  |
Total | [1] | 1,148,007,000 |  |  |  |
Accumulated Depreciation | [2] | (235,838,000) |  |  |  |
Net Cost Basis |  | 912,169,000 |  |  |  |
Alexandria Center for Life Science - South Lake Union |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 229,607,000 |  |  |  |
Buildings & Improvements |  | 1,128,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 425,392,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 229,607,000 |  |  |  |
Buildings & Improvements |  | 426,520,000 |  |  |  |
Total | [1] | 656,127,000 |  |  |  |
Accumulated Depreciation | [2] | (51,917,000) |  |  |  |
Net Cost Basis |  | 604,210,000 |  |  |  |
219 Terry Avenue North |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 1,819,000 |  |  |  |
Buildings & Improvements |  | 2,302,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 20,898,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 1,819,000 |  |  |  |
Buildings & Improvements |  | 23,200,000 |  |  |  |
Total | [1] | 25,019,000 |  |  |  |
Accumulated Depreciation | [2] | (9,827,000) |  |  |  |
Net Cost Basis |  | 15,192,000 |  |  |  |
830 and 1010 4th Avenue South |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 52,700,000 |  |  |  |
Buildings & Improvements |  | 12,062,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 15,016,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 52,700,000 |  |  |  |
Buildings & Improvements |  | 27,078,000 |  |  |  |
Total | [1] | 79,778,000 |  |  |  |
Accumulated Depreciation | [2] | (1,073,000) |  |  |  |
Net Cost Basis |  | 78,705,000 |  |  |  |
3000/3018 Western Avenue |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 1,432,000 |  |  |  |
Buildings & Improvements |  | 7,497,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 24,890,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 1,432,000 |  |  |  |
Buildings & Improvements |  | 32,387,000 |  |  |  |
Total | [1] | 33,819,000 |  |  |  |
Accumulated Depreciation | [2] | (28,629,000) |  |  |  |
Net Cost Basis |  | 5,190,000 |  |  |  |
410 West Harrison/410 Elliott Avenue West |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 3,857,000 |  |  |  |
Buildings & Improvements |  | 1,989,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 20,434,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 3,857,000 |  |  |  |
Buildings & Improvements |  | 22,423,000 |  |  |  |
Total | [1] | 26,280,000 |  |  |  |
Accumulated Depreciation | [2] | (10,200,000) |  |  |  |
Net Cost Basis |  | 16,080,000 |  |  |  |
Alexandria Center for Advanced Technologies - Canyon Park |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 117,302,000 |  |  |  |
Buildings & Improvements |  | 182,213,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 26,146,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 117,302,000 |  |  |  |
Buildings & Improvements |  | 208,359,000 |  |  |  |
Total | [1] | 325,661,000 |  |  |  |
Accumulated Depreciation | [2] | (13,803,000) |  |  |  |
Net Cost Basis |  | 311,858,000 |  |  |  |
Alexandria Center for Advanced Technologies - Monte Villa Parkway |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 52,464,000 |  |  |  |
Buildings & Improvements |  | 64,753,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 80,630,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 52,464,000 |  |  |  |
Buildings & Improvements |  | 145,383,000 |  |  |  |
Total | [1] | 197,847,000 |  |  |  |
Accumulated Depreciation | [2] | (2,772,000) |  |  |  |
Net Cost Basis |  | 195,075,000 |  |  |  |
Other - Seattle |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 78,900,000 |  |  |  |
Buildings & Improvements |  | 931,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 24,453,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 78,900,000 |  |  |  |
Buildings & Improvements |  | 25,384,000 |  |  |  |
Total | [1] | 104,284,000 |  |  |  |
Accumulated Depreciation | [2] | (942,000) |  |  |  |
Net Cost Basis |  | 103,342,000 |  |  |  |
Alexandria Center for Life Science - Shady Grove |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 85,365,000 |  |  |  |
Buildings & Improvements |  | 253,567,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 653,805,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 85,365,000 |  |  |  |
Buildings & Improvements |  | 907,372,000 |  |  |  |
Total | [1] | 992,737,000 |  |  |  |
Accumulated Depreciation | [2] | (148,111,000) |  |  |  |
Net Cost Basis |  | 844,626,000 |  |  |  |
1330 Piccard Drive |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 2,800,000 |  |  |  |
Buildings & Improvements |  | 11,533,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 37,915,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 2,800,000 |  |  |  |
Buildings & Improvements |  | 49,448,000 |  |  |  |
Total | [1] | 52,248,000 |  |  |  |
Accumulated Depreciation | [2] | (25,154,000) |  |  |  |
Net Cost Basis |  | 27,094,000 |  |  |  |
1405 Research Boulevard |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 899,000 |  |  |  |
Buildings & Improvements |  | 21,946,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 15,818,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 899,000 |  |  |  |
Buildings & Improvements |  | 37,764,000 |  |  |  |
Total | [1] | 38,663,000 |  |  |  |
Accumulated Depreciation | [2] | (19,356,000) |  |  |  |
Net Cost Basis |  | 19,307,000 |  |  |  |
1500 and 1550 East Gude Drive |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 1,523,000 |  |  |  |
Buildings & Improvements |  | 7,731,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 10,709,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 1,523,000 |  |  |  |
Buildings & Improvements |  | 18,440,000 |  |  |  |
Total | [1] | 19,963,000 |  |  |  |
Accumulated Depreciation | [2] | (11,916,000) |  |  |  |
Net Cost Basis |  | 8,047,000 |  |  |  |
5 Research Place |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 1,466,000 |  |  |  |
Buildings & Improvements |  | 5,708,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 31,235,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 1,466,000 |  |  |  |
Buildings & Improvements |  | 36,943,000 |  |  |  |
Total | [1] | 38,409,000 |  |  |  |
Accumulated Depreciation | [2] | (19,450,000) |  |  |  |
Net Cost Basis |  | 18,959,000 |  |  |  |
5 Research Court |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 1,647,000 |  |  |  |
Buildings & Improvements |  | 13,258,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 24,110,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 1,647,000 |  |  |  |
Buildings & Improvements |  | 37,368,000 |  |  |  |
Total | [1] | 39,015,000 |  |  |  |
Accumulated Depreciation | [2] | (18,805,000) |  |  |  |
Net Cost Basis |  | 20,210,000 |  |  |  |
12301 Parklawn Drive |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 1,476,000 |  |  |  |
Buildings & Improvements |  | 7,267,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 1,734,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 1,476,000 |  |  |  |
Buildings & Improvements |  | 9,001,000 |  |  |  |
Total | [1] | 10,477,000 |  |  |  |
Accumulated Depreciation | [2] | (4,096,000) |  |  |  |
Net Cost Basis |  | 6,381,000 |  |  |  |
Alexandria Technology Center - Gaithersburg I |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 20,980,000 |  |  |  |
Buildings & Improvements |  | 121,952,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 56,847,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 20,980,000 |  |  |  |
Buildings & Improvements |  | 178,799,000 |  |  |  |
Total | [1] | 199,779,000 |  |  |  |
Accumulated Depreciation | [2] | (60,439,000) |  |  |  |
Net Cost Basis |  | 139,340,000 |  |  |  |
Alexandria Technology Center - Gaithersburg II |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 17,134,000 |  |  |  |
Buildings & Improvements |  | 67,825,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 108,021,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 17,134,000 |  |  |  |
Buildings & Improvements |  | 175,846,000 |  |  |  |
Total | [1] | 192,980,000 |  |  |  |
Accumulated Depreciation | [2] | (47,157,000) |  |  |  |
Net Cost Basis |  | 145,823,000 |  |  |  |
20400 Century Boulevard |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 3,641,000 |  |  |  |
Buildings & Improvements |  | 4,759,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 26,397,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 3,641,000 |  |  |  |
Buildings & Improvements |  | 31,156,000 |  |  |  |
Total | [1] | 34,797,000 |  |  |  |
Accumulated Depreciation | [2] | (3,667,000) |  |  |  |
Net Cost Basis |  | 31,130,000 |  |  |  |
401 Professional Drive |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 1,129,000 |  |  |  |
Buildings & Improvements |  | 6,941,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 11,666,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 1,129,000 |  |  |  |
Buildings & Improvements |  | 18,607,000 |  |  |  |
Total | [1] | 19,736,000 |  |  |  |
Accumulated Depreciation | [2] | (10,023,000) |  |  |  |
Net Cost Basis |  | 9,713,000 |  |  |  |
950 Wind River Lane |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 2,400,000 |  |  |  |
Buildings & Improvements |  | 10,620,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 1,591,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 2,400,000 |  |  |  |
Buildings & Improvements |  | 12,211,000 |  |  |  |
Total | [1] | 14,611,000 |  |  |  |
Accumulated Depreciation | [2] | (4,473,000) |  |  |  |
Net Cost Basis |  | 10,138,000 |  |  |  |
620 Professional Drive |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 784,000 |  |  |  |
Buildings & Improvements |  | 4,705,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 8,268,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 784,000 |  |  |  |
Buildings & Improvements |  | 12,973,000 |  |  |  |
Total | [1] | 13,757,000 |  |  |  |
Accumulated Depreciation | [2] | (8,531,000) |  |  |  |
Net Cost Basis |  | 5,226,000 |  |  |  |
8000/9000/10000 Virginia Manor Road |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 0 |  |  |  |
Buildings & Improvements |  | 13,679,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 11,706,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 0 |  |  |  |
Buildings & Improvements |  | 25,385,000 |  |  |  |
Total | [1] | 25,385,000 |  |  |  |
Accumulated Depreciation | [2] | (13,423,000) |  |  |  |
Net Cost Basis |  | 11,962,000 |  |  |  |
14225 Newbrook Drive |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 4,800,000 |  |  |  |
Buildings & Improvements |  | 27,639,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 22,773,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 4,800,000 |  |  |  |
Buildings & Improvements |  | 50,412,000 |  |  |  |
Total | [1] | 55,212,000 |  |  |  |
Accumulated Depreciation | [2] | (23,219,000) |  |  |  |
Net Cost Basis |  | 31,993,000 |  |  |  |
Alexandria Center for Life Science - Durham |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 190,236,000 |  |  |  |
Buildings & Improvements |  | 471,263,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 252,275,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 190,236,000 |  |  |  |
Buildings & Improvements |  | 723,538,000 |  |  |  |
Total | [1] | 913,774,000 |  |  |  |
Accumulated Depreciation | [2] | (52,766,000) |  |  |  |
Net Cost Basis |  | 861,008,000 |  |  |  |
Alexandria Center for Advanced Technologies - Research Triangle |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 27,784,000 |  |  |  |
Buildings & Improvements |  | 16,958,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 256,806,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 27,784,000 |  |  |  |
Buildings & Improvements |  | 273,764,000 |  |  |  |
Total | [1] | 301,548,000 |  |  |  |
Accumulated Depreciation | [2] | (25,537,000) |  |  |  |
Net Cost Basis |  | 276,011,000 |  |  |  |
Alexandria Center for AgTech |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 2,801,000 |  |  |  |
Buildings & Improvements |  | 6,756,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 208,994,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 2,801,000 |  |  |  |
Buildings & Improvements |  | 215,750,000 |  |  |  |
Total | [1] | 218,551,000 |  |  |  |
Accumulated Depreciation | [2] | (25,683,000) |  |  |  |
Net Cost Basis |  | 192,868,000 |  |  |  |
Alexandria Center for Sustainable Technologies |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 54,908,000 |  |  |  |
Buildings & Improvements |  | 18,849,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 123,255,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 54,908,000 |  |  |  |
Buildings & Improvements |  | 142,104,000 |  |  |  |
Total | [1] | 197,012,000 |  |  |  |
Accumulated Depreciation | [2] | (51,203,000) |  |  |  |
Net Cost Basis |  | 145,809,000 |  |  |  |
Alexandria Technology Center - Alston |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 1,430,000 |  |  |  |
Buildings & Improvements |  | 17,482,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 34,099,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 1,430,000 |  |  |  |
Buildings & Improvements |  | 51,581,000 |  |  |  |
Total | [1] | 53,011,000 |  |  |  |
Accumulated Depreciation | [2] | (28,919,000) |  |  |  |
Net Cost Basis |  | 24,092,000 |  |  |  |
6040 George Watts Hill Drive |  |  |  |  |  |
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 |  | 88,166,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 0 |  |  |  |
Buildings & Improvements |  | 88,166,000 |  |  |  |
Total | [1] | 88,166,000 |  |  |  |
Accumulated Depreciation | [2] | (6,806,000) |  |  |  |
Net Cost Basis |  | 81,360,000 |  |  |  |
Alexandria Innovation Center - Research Triangle |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 1,065,000 |  |  |  |
Buildings & Improvements |  | 21,218,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 31,979,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 1,065,000 |  |  |  |
Buildings & Improvements |  | 53,197,000 |  |  |  |
Total | [1] | 54,262,000 |  |  |  |
Accumulated Depreciation | [2] | (25,398,000) |  |  |  |
Net Cost Basis |  | 28,864,000 |  |  |  |
2525 East NC Highway 54 |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 713,000 |  |  |  |
Buildings & Improvements |  | 12,827,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 20,750,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 713,000 |  |  |  |
Buildings & Improvements |  | 33,577,000 |  |  |  |
Total | [1] | 34,290,000 |  |  |  |
Accumulated Depreciation | [2] | (17,078,000) |  |  |  |
Net Cost Basis |  | 17,212,000 |  |  |  |
601 Keystone Park Drive |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 785,000 |  |  |  |
Buildings & Improvements |  | 11,546,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 15,846,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 785,000 |  |  |  |
Buildings & Improvements |  | 27,392,000 |  |  |  |
Total | [1] | 28,177,000 |  |  |  |
Accumulated Depreciation | [2] | (8,861,000) |  |  |  |
Net Cost Basis |  | 19,316,000 |  |  |  |
6101 Quadrangle Drive |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 951,000 |  |  |  |
Buildings & Improvements |  | 3,982,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 12,261,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 951,000 |  |  |  |
Buildings & Improvements |  | 16,243,000 |  |  |  |
Total | [1] | 17,194,000 |  |  |  |
Accumulated Depreciation | [2] | (5,064,000) |  |  |  |
Net Cost Basis |  | 12,130,000 |  |  |  |
Alexandria Center for NextGen Medicines |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 94,184,000 |  |  |  |
Buildings & Improvements |  | 0 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 10,358,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 94,184,000 |  |  |  |
Buildings & Improvements |  | 10,358,000 |  |  |  |
Total | [1] | 104,542,000 |  |  |  |
Accumulated Depreciation | [2] | 0 |  |  |  |
Net Cost Basis |  | 104,542,000 |  |  |  |
Intersection Campus |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 159,310,000 |  |  |  |
Buildings & Improvements |  | 440,295,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 39,352,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 159,310,000 |  |  |  |
Buildings & Improvements |  | 479,647,000 |  |  |  |
Total | [1] | 638,957,000 |  |  |  |
Accumulated Depreciation | [2] | (23,934,000) |  |  |  |
Net Cost Basis |  | 615,023,000 |  |  |  |
1020 Red River Street and 1001 Trinity Street |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 66,451,000 |  |  |  |
Buildings & Improvements |  | 61,732,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 1,333,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 66,451,000 |  |  |  |
Buildings & Improvements |  | 63,065,000 |  |  |  |
Total | [1] | 129,516,000 |  |  |  |
Accumulated Depreciation | [2] | (1,942,000) |  |  |  |
Net Cost Basis |  | 127,574,000 |  |  |  |
Alexandria Center for Advanced Technologies at The Woodlands |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 2,116,000 |  |  |  |
Buildings & Improvements |  | 9,784,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 122,047,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 2,116,000 |  |  |  |
Buildings & Improvements |  | 131,831,000 |  |  |  |
Total | [1] | 133,947,000 |  |  |  |
Accumulated Depreciation | [2] | (669,000) |  |  |  |
Net Cost Basis |  | 133,278,000 |  |  |  |
Other - Texas |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 110,867,000 |  |  |  |
Buildings & Improvements |  | 219,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 22,793,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 110,867,000 |  |  |  |
Buildings & Improvements |  | 23,012,000 |  |  |  |
Total | [1] | 133,879,000 |  |  |  |
Accumulated Depreciation | [2] | (122,000) |  |  |  |
Net Cost Basis |  | 133,757,000 |  |  |  |
Canada |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 77,005,000 |  |  |  |
Buildings & Improvements |  | 167,405,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 97,403,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 77,005,000 |  |  |  |
Buildings & Improvements |  | 264,808,000 |  |  |  |
Total | [1] | 341,813,000 |  |  |  |
Accumulated Depreciation | [2] | (34,320,000) |  |  |  |
Net Cost Basis |  | 307,493,000 |  |  |  |
Various |  |  |  |  |  |
Consolidated Financial Statement Schedule of Rental Properties and Accumulated Depreciation |  |  |  |  |  |
Encumbrances |  | 0 |  |  |  |
Initial Costs |  |  |  |  |  |
Land |  | 340,160,000 |  |  |  |
Buildings & Improvements |  | 229,903,000 |  |  |  |
Costs Capitalized Subsequent to Acquisition |  |  |  |  |  |
Buildings & Improvements |  | 173,747,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 340,160,000 |  |  |  |
Buildings & Improvements |  | 403,650,000 |  |  |  |
Total | [1] | 743,810,000 |  |  |  |
Accumulated Depreciation | [2] | (157,298,000) |  |  |  |
Net Cost Basis |  | 586,512,000 |  |  |  |
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 |  | 4,212,000 |  |  |  |
Total Costs |  |  |  |  |  |
Land |  | 0 |  |  |  |
Buildings & Improvements |  | 4,212,000 |  |  |  |
Total | [1] | 4,212,000 |  |  |  |
Accumulated Depreciation | [2] | (4,212,000) |  |  |  |
Net Cost Basis |  | $ 0 |  |  |  |
[1] | As of December 31, 2023, the total cost of our real estate assets aggregated $36.6 billion, which exceeded the cost of real estate for federal income tax purposes aggregating $36.1 billion by approximately $483.2 million.
[2] | The depreciable life ranges up to 40 years for buildings and improvements, up to 20 years for land improvements, and the term of the respective lease for tenant improvements.

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