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SCHEDULE III REAL ESTATE AND ACCUMULATED DEPRECIATION - Properties (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Real Estate and Accumulated Depreciation        
Encumbrances $ 3,199,809      
Initial Cost to Company        
Land and Improvements 2,687,667      
Buildings and Improvements 26,491,617      
Costs Capitalized Subsequent to Acquisition 2,650,727      
Gross Amount Carried at Close of Period        
Land and Improvements 2,775,790      
Buildings and Improvements 29,054,221      
Total 31,830,011 $ 30,165,798 $ 28,768,409 $ 28,479,870
Accumulated Depreciation 9,839,538 $ 9,016,173 $ 8,231,160 $ 7,433,480
Net Book Value 21,990,473      
UNITED STATES PROPERTIES | Senior Housing        
Real Estate and Accumulated Depreciation        
Encumbrances 1,205,325      
Initial Cost to Company        
Land and Improvements 1,590,079      
Buildings and Improvements 14,828,525      
Costs Capitalized Subsequent to Acquisition 1,645,653      
Gross Amount Carried at Close of Period        
Land and Improvements 1,644,790      
Buildings and Improvements 16,419,466      
Total 18,064,256      
Accumulated Depreciation 5,903,987      
Net Book Value 12,160,273      
UNITED STATES PROPERTIES | Senior Housing | Atria Senior Living        
Real Estate and Accumulated Depreciation        
Encumbrances 808,973      
Initial Cost to Company        
Land and Improvements 511,890      
Buildings and Improvements 4,640,742      
Costs Capitalized Subsequent to Acquisition 759,032      
Gross Amount Carried at Close of Period        
Land and Improvements 542,415      
Buildings and Improvements 5,369,249      
Total 5,911,664      
Accumulated Depreciation 2,018,616      
Net Book Value 3,893,048      
UNITED STATES PROPERTIES | Senior Housing | Brookdale Senior Living        
Real Estate and Accumulated Depreciation        
Encumbrances 48,040      
Initial Cost to Company        
Land and Improvements 190,091      
Buildings and Improvements 1,860,167      
Costs Capitalized Subsequent to Acquisition 131,497      
Gross Amount Carried at Close of Period        
Land and Improvements 190,698      
Buildings and Improvements 1,991,057      
Total 2,181,755      
Accumulated Depreciation 1,066,193      
Net Book Value 1,115,563      
UNITED STATES PROPERTIES | Senior Housing | Sunrise Senior Living        
Real Estate and Accumulated Depreciation        
Encumbrances 41,372      
Initial Cost to Company        
Land and Improvements 210,207      
Buildings and Improvements 2,331,589      
Costs Capitalized Subsequent to Acquisition 275,821      
Gross Amount Carried at Close of Period        
Land and Improvements 223,688      
Buildings and Improvements 2,593,930      
Total 2,817,617      
Accumulated Depreciation 1,194,960      
Net Book Value 1,622,657      
UNITED STATES PROPERTIES | Senior Housing | Sinceri Senior Living        
Real Estate and Accumulated Depreciation        
Encumbrances 0      
Initial Cost to Company        
Land and Improvements 74,077      
Buildings and Improvements 693,443      
Costs Capitalized Subsequent to Acquisition 83,227      
Gross Amount Carried at Close of Period        
Land and Improvements 76,113      
Buildings and Improvements 774,634      
Total 850,747      
Accumulated Depreciation 278,086      
Net Book Value 572,661      
UNITED STATES PROPERTIES | Senior Housing | Discovery Senior Living        
Real Estate and Accumulated Depreciation        
Encumbrances 27,964      
Initial Cost to Company        
Land and Improvements 72,430      
Buildings and Improvements 659,902      
Costs Capitalized Subsequent to Acquisition 53,549      
Gross Amount Carried at Close of Period        
Land and Improvements 73,629      
Buildings and Improvements 712,253      
Total 785,881      
Accumulated Depreciation 168,124      
Net Book Value 617,758      
UNITED STATES PROPERTIES | Senior Housing | Priority Life Care Properties        
Real Estate and Accumulated Depreciation        
Encumbrances 37,954      
Initial Cost to Company        
Land and Improvements 47,010      
Buildings and Improvements 445,682      
Costs Capitalized Subsequent to Acquisition 68,896      
Gross Amount Carried at Close of Period        
Land and Improvements 48,199      
Buildings and Improvements 513,388      
Total 561,588      
Accumulated Depreciation 179,116      
Net Book Value 382,471      
UNITED STATES PROPERTIES | Senior Housing | Sodalis Senior Living        
Real Estate and Accumulated Depreciation        
Encumbrances 0      
Initial Cost to Company        
Land and Improvements 52,780      
Buildings and Improvements 441,080      
Costs Capitalized Subsequent to Acquisition 52,397      
Gross Amount Carried at Close of Period        
Land and Improvements 53,402      
Buildings and Improvements 492,856      
Total 546,257      
Accumulated Depreciation 162,765      
Net Book Value 383,492      
UNITED STATES PROPERTIES | Senior Housing | Grace Management        
Real Estate and Accumulated Depreciation        
Encumbrances 17,662      
Initial Cost to Company        
Land and Improvements 98,083      
Buildings and Improvements 655,799      
Costs Capitalized Subsequent to Acquisition 13,278      
Gross Amount Carried at Close of Period        
Land and Improvements 98,082      
Buildings and Improvements 669,078      
Total 767,160      
Accumulated Depreciation 28,040      
Net Book Value 739,120      
UNITED STATES PROPERTIES | Senior Housing | Koelsch Senior Communities        
Real Estate and Accumulated Depreciation        
Encumbrances 64,403      
Initial Cost to Company        
Land and Improvements 27,721      
Buildings and Improvements 292,414      
Costs Capitalized Subsequent to Acquisition 13,289      
Gross Amount Carried at Close of Period        
Land and Improvements 28,133      
Buildings and Improvements 305,291      
Total 333,424      
Accumulated Depreciation 83,674      
Net Book Value 249,750      
UNITED STATES PROPERTIES | Senior Housing | Senior Lifestyle        
Real Estate and Accumulated Depreciation        
Encumbrances 0      
Initial Cost to Company        
Land and Improvements 55,911      
Buildings and Improvements 553,261      
Costs Capitalized Subsequent to Acquisition 27,969      
Gross Amount Carried at Close of Period        
Land and Improvements 57,328      
Buildings and Improvements 579,813      
Total 637,141      
Accumulated Depreciation 76,081      
Net Book Value 561,059      
UNITED STATES PROPERTIES | Senior Housing | Sonida Senior Living        
Real Estate and Accumulated Depreciation        
Encumbrances 12,401      
Initial Cost to Company        
Land and Improvements 18,129      
Buildings and Improvements 197,928      
Costs Capitalized Subsequent to Acquisition 38,816      
Gross Amount Carried at Close of Period        
Land and Improvements 18,833      
Buildings and Improvements 236,040      
Total 254,873      
Accumulated Depreciation 89,332      
Net Book Value 165,541      
UNITED STATES PROPERTIES | Senior Housing | Meridian Senior Living        
Real Estate and Accumulated Depreciation        
Encumbrances 0      
Initial Cost to Company        
Land and Improvements 19,090      
Buildings and Improvements 104,237      
Costs Capitalized Subsequent to Acquisition 2,025      
Gross Amount Carried at Close of Period        
Land and Improvements 19,091      
Buildings and Improvements 106,261      
Total 125,352      
Accumulated Depreciation 29,308      
Net Book Value 96,044      
UNITED STATES PROPERTIES | Senior Housing | Azura Memory Care        
Real Estate and Accumulated Depreciation        
Encumbrances 0      
Initial Cost to Company        
Land and Improvements 6,361      
Buildings and Improvements 53,002      
Costs Capitalized Subsequent to Acquisition 7,193      
Gross Amount Carried at Close of Period        
Land and Improvements 7,200      
Buildings and Improvements 59,356      
Total 66,556      
Accumulated Depreciation 24,560      
Net Book Value 41,996      
UNITED STATES PROPERTIES | Senior Housing | Milestone Retirement Communities        
Real Estate and Accumulated Depreciation        
Encumbrances 0      
Initial Cost to Company        
Land and Improvements 16,810      
Buildings and Improvements 183,225      
Costs Capitalized Subsequent to Acquisition 20,049      
Gross Amount Carried at Close of Period        
Land and Improvements 16,903      
Buildings and Improvements 203,181      
Total 220,084      
Accumulated Depreciation 60,488      
Net Book Value 159,596      
UNITED STATES PROPERTIES | Senior Housing | American House        
Real Estate and Accumulated Depreciation        
Encumbrances 0      
Initial Cost to Company        
Land and Improvements 5,438      
Buildings and Improvements 124,369      
Costs Capitalized Subsequent to Acquisition 20,905      
Gross Amount Carried at Close of Period        
Land and Improvements 6,926      
Buildings and Improvements 143,786      
Total 150,712      
Accumulated Depreciation 65,038      
Net Book Value 85,674      
UNITED STATES PROPERTIES | Senior Housing | Avamere Family of Companies        
Real Estate and Accumulated Depreciation        
Encumbrances 0      
Initial Cost to Company        
Land and Improvements 20,407      
Buildings and Improvements 113,192      
Costs Capitalized Subsequent to Acquisition 13,817      
Gross Amount Carried at Close of Period        
Land and Improvements 20,654      
Buildings and Improvements 126,763      
Total 147,416      
Accumulated Depreciation 50,780      
Net Book Value 96,636      
UNITED STATES PROPERTIES | Senior Housing | Hawthorn Senior Living        
Real Estate and Accumulated Depreciation        
Encumbrances 55,205      
Initial Cost to Company        
Land and Improvements 35,668      
Buildings and Improvements 220,099      
Costs Capitalized Subsequent to Acquisition 19,542      
Gross Amount Carried at Close of Period        
Land and Improvements 35,890      
Buildings and Improvements 239,418      
Total 275,309      
Accumulated Depreciation 34,035      
Net Book Value 241,274      
UNITED STATES PROPERTIES | Senior Housing | Other Senior Housing Operators        
Real Estate and Accumulated Depreciation        
Encumbrances 91,351      
Initial Cost to Company        
Land and Improvements 127,976      
Buildings and Improvements 1,258,229      
Costs Capitalized Subsequent to Acquisition 44,351      
Gross Amount Carried at Close of Period        
Land and Improvements 127,606      
Buildings and Improvements 1,302,947      
Total 1,430,555      
Accumulated Depreciation 294,791      
Net Book Value 1,135,768      
UNITED STATES PROPERTIES | Senior Housing | Other Senior Housing CIP        
Real Estate and Accumulated Depreciation        
Encumbrances 0      
Initial Cost to Company        
Land and Improvements 0      
Buildings and Improvements 165      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at Close of Period        
Land and Improvements 0      
Buildings and Improvements 165      
Total 165      
Accumulated Depreciation 0      
Net Book Value 165      
UNITED STATES PROPERTIES | Research        
Real Estate and Accumulated Depreciation        
Encumbrances 299,295      
Initial Cost to Company        
Land and Improvements 72,958      
Buildings and Improvements 1,517,210      
Costs Capitalized Subsequent to Acquisition 314,260      
Gross Amount Carried at Close of Period        
Land and Improvements 141,653      
Buildings and Improvements 1,762,775      
Total 1,904,428      
Accumulated Depreciation 402,645      
Net Book Value 1,501,783      
UNITED STATES PROPERTIES | Research | Wexford        
Real Estate and Accumulated Depreciation        
Encumbrances 227,600      
Initial Cost to Company        
Land and Improvements 71,764      
Buildings and Improvements 1,429,367      
Costs Capitalized Subsequent to Acquisition 55,798      
Gross Amount Carried at Close of Period        
Land and Improvements 71,002      
Buildings and Improvements 1,485,927      
Total 1,556,929      
Accumulated Depreciation 381,547      
Net Book Value 1,175,382      
UNITED STATES PROPERTIES | Research | Other Life Science        
Real Estate and Accumulated Depreciation        
Encumbrances 0      
Initial Cost to Company        
Land and Improvements 1,194      
Buildings and Improvements 76,515      
Costs Capitalized Subsequent to Acquisition 290      
Gross Amount Carried at Close of Period        
Land and Improvements 1,193      
Buildings and Improvements 76,806      
Total 77,999      
Accumulated Depreciation 12,334      
Net Book Value 65,665      
UNITED STATES PROPERTIES | Research | Other Life Science CIP        
Real Estate and Accumulated Depreciation        
Encumbrances 71,695      
Initial Cost to Company        
Land and Improvements 0      
Buildings and Improvements 11,328      
Costs Capitalized Subsequent to Acquisition 258,172      
Gross Amount Carried at Close of Period        
Land and Improvements 69,458      
Buildings and Improvements 200,042      
Total 269,500      
Accumulated Depreciation 8,764      
Net Book Value 260,736      
UNITED STATES PROPERTIES | IRFs & LTACs        
Real Estate and Accumulated Depreciation        
Encumbrances 0      
Initial Cost to Company        
Land and Improvements 104,665      
Buildings and Improvements 547,003      
Costs Capitalized Subsequent to Acquisition 410      
Gross Amount Carried at Close of Period        
Land and Improvements 103,671      
Buildings and Improvements 548,407      
Total 652,077      
Accumulated Depreciation 268,659      
Net Book Value 383,419      
UNITED STATES PROPERTIES | IRFs & LTACs | Kindred Healthcare        
Real Estate and Accumulated Depreciation        
Encumbrances 0      
Initial Cost to Company        
Land and Improvements 86,024      
Buildings and Improvements 348,554      
Costs Capitalized Subsequent to Acquisition (660)      
Gross Amount Carried at Close of Period        
Land and Improvements 85,027      
Buildings and Improvements 348,890      
Total 433,917      
Accumulated Depreciation 212,065      
Net Book Value 221,852      
UNITED STATES PROPERTIES | IRFs & LTACs | Other IRFs And LTACs        
Real Estate and Accumulated Depreciation        
Encumbrances 0      
Initial Cost to Company        
Land and Improvements 18,641      
Buildings and Improvements 198,449      
Costs Capitalized Subsequent to Acquisition 1,070      
Gross Amount Carried at Close of Period        
Land and Improvements 18,644      
Buildings and Improvements 199,517      
Total 218,160      
Accumulated Depreciation 56,594      
Net Book Value 161,567      
UNITED STATES PROPERTIES | Other Healthcare Facilities | Ardent Health Services        
Real Estate and Accumulated Depreciation        
Encumbrances 0      
Initial Cost to Company        
Land and Improvements 98,428      
Buildings and Improvements 1,126,010      
Costs Capitalized Subsequent to Acquisition 78,106      
Gross Amount Carried at Close of Period        
Land and Improvements 97,416      
Buildings and Improvements 1,205,128      
Total 1,302,544      
Accumulated Depreciation 321,882      
Net Book Value 980,663      
UNITED STATES PROPERTIES | Skilled Nursing        
Real Estate and Accumulated Depreciation        
Encumbrances 0      
Initial Cost to Company        
Land and Improvements 42,852      
Buildings and Improvements 357,257      
Costs Capitalized Subsequent to Acquisition (28,415)      
Gross Amount Carried at Close of Period        
Land and Improvements 43,033      
Buildings and Improvements 328,661      
Total 371,694      
Accumulated Depreciation 109,050      
Net Book Value 262,643      
UNITED STATES PROPERTIES | Skilled Nursing | Genesis Healthcare        
Real Estate and Accumulated Depreciation        
Encumbrances 0      
Initial Cost to Company        
Land and Improvements 11,350      
Buildings and Improvements 164,745      
Costs Capitalized Subsequent to Acquisition (5,708)      
Gross Amount Carried at Close of Period        
Land and Improvements 11,350      
Buildings and Improvements 159,037      
Total 170,387      
Accumulated Depreciation 82,117      
Net Book Value 88,270      
UNITED STATES PROPERTIES | Skilled Nursing | Other Skilled Nursing Operations        
Real Estate and Accumulated Depreciation        
Encumbrances 0      
Initial Cost to Company        
Land and Improvements 31,502      
Buildings and Improvements 192,512      
Costs Capitalized Subsequent to Acquisition (22,707)      
Gross Amount Carried at Close of Period        
Land and Improvements 31,683      
Buildings and Improvements 169,624      
Total 201,307      
Accumulated Depreciation 26,933      
Net Book Value 174,373      
UNITED STATES PROPERTIES | Outpatient Medical Buildings And Other        
Real Estate and Accumulated Depreciation        
Encumbrances 273,572      
Initial Cost to Company        
Land and Improvements 415,987      
Buildings and Improvements 4,518,823      
Costs Capitalized Subsequent to Acquisition 960,261      
Gross Amount Carried at Close of Period        
Land and Improvements 424,000      
Buildings and Improvements 5,471,072      
Total 5,895,071      
Accumulated Depreciation 2,087,077      
Net Book Value 3,807,994      
UNITED STATES PROPERTIES | Outpatient Medical Buildings And Other | Lillibridge        
Real Estate and Accumulated Depreciation        
Encumbrances 24,760      
Initial Cost to Company        
Land and Improvements 165,132      
Buildings and Improvements 2,113,822      
Costs Capitalized Subsequent to Acquisition 683,332      
Gross Amount Carried at Close of Period        
Land and Improvements 170,334      
Buildings and Improvements 2,791,952      
Total 2,962,286      
Accumulated Depreciation 1,223,597      
Net Book Value 1,738,689      
UNITED STATES PROPERTIES | Outpatient Medical Buildings And Other | PMB RES        
Real Estate and Accumulated Depreciation        
Encumbrances 238,007      
Initial Cost to Company        
Land and Improvements 80,638      
Buildings and Improvements 975,535      
Costs Capitalized Subsequent to Acquisition 198,377      
Gross Amount Carried at Close of Period        
Land and Improvements 82,416      
Buildings and Improvements 1,172,134      
Total 1,254,550      
Accumulated Depreciation 433,324      
Net Book Value 821,226      
UNITED STATES PROPERTIES | Outpatient Medical Buildings And Other | Cornerstone Companies, Inc        
Real Estate and Accumulated Depreciation        
Encumbrances 0      
Initial Cost to Company        
Land and Improvements 28,336      
Buildings and Improvements 156,018      
Costs Capitalized Subsequent to Acquisition 3,636      
Gross Amount Carried at Close of Period        
Land and Improvements 28,417      
Buildings and Improvements 159,573      
Total 187,990      
Accumulated Depreciation 11,531      
Net Book Value 176,459      
UNITED STATES PROPERTIES | Outpatient Medical Buildings And Other | Ardent Health Services        
Real Estate and Accumulated Depreciation        
Encumbrances 0      
Initial Cost to Company        
Land and Improvements 5,638      
Buildings and Improvements 214,808      
Costs Capitalized Subsequent to Acquisition 599      
Gross Amount Carried at Close of Period        
Land and Improvements 5,638      
Buildings and Improvements 215,408      
Total 221,045      
Accumulated Depreciation 20,329      
Net Book Value 200,716      
UNITED STATES PROPERTIES | Outpatient Medical Buildings And Other | Memorial Health Services        
Real Estate and Accumulated Depreciation        
Encumbrances 0      
Initial Cost to Company        
Land and Improvements 2,346      
Buildings and Improvements 25,031      
Costs Capitalized Subsequent to Acquisition 13,169      
Gross Amount Carried at Close of Period        
Land and Improvements 2,453      
Buildings and Improvements 38,093      
Total 40,546      
Accumulated Depreciation 24,592      
Net Book Value 15,954      
UNITED STATES PROPERTIES | Outpatient Medical Buildings And Other | Other MOBs        
Real Estate and Accumulated Depreciation        
Encumbrances 10,805      
Initial Cost to Company        
Land and Improvements 133,897      
Buildings and Improvements 1,033,609      
Costs Capitalized Subsequent to Acquisition 55,493      
Gross Amount Carried at Close of Period        
Land and Improvements 131,098      
Buildings and Improvements 1,091,901      
Total 1,222,999      
Accumulated Depreciation 371,341      
Net Book Value 851,658      
UNITED STATES PROPERTIES | Outpatient Medical Buildings And Other | Other MOBs CIP        
Real Estate and Accumulated Depreciation        
Encumbrances 0      
Initial Cost to Company        
Land and Improvements 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition 5,655      
Gross Amount Carried at Close of Period        
Land and Improvements 3,644      
Buildings and Improvements 2,011      
Total 5,655      
Accumulated Depreciation 2,363      
Net Book Value 3,292      
CANADIAN PROPERTIES | Senior Housing        
Real Estate and Accumulated Depreciation        
Encumbrances 1,421,617      
Initial Cost to Company        
Land and Improvements 310,314      
Buildings and Improvements 3,378,442      
Costs Capitalized Subsequent to Acquisition (273,078)      
Gross Amount Carried at Close of Period        
Land and Improvements 277,094      
Buildings and Improvements 3,138,584      
Total 3,415,678      
Accumulated Depreciation 701,131      
Net Book Value 2,714,547      
CANADIAN PROPERTIES | Senior Housing | Atria Senior Living        
Real Estate and Accumulated Depreciation        
Encumbrances 265,047      
Initial Cost to Company        
Land and Improvements 75,553      
Buildings and Improvements 845,363      
Costs Capitalized Subsequent to Acquisition (110,078)      
Gross Amount Carried at Close of Period        
Land and Improvements 63,843      
Buildings and Improvements 746,995      
Total 810,838      
Accumulated Depreciation 272,953      
Net Book Value 537,885      
CANADIAN PROPERTIES | Senior Housing | Sunrise Senior Living        
Real Estate and Accumulated Depreciation        
Encumbrances 0      
Initial Cost to Company        
Land and Improvements 46,600      
Buildings and Improvements 418,821      
Costs Capitalized Subsequent to Acquisition (83,373)      
Gross Amount Carried at Close of Period        
Land and Improvements 36,994      
Buildings and Improvements 345,053      
Total 382,048      
Accumulated Depreciation 173,318      
Net Book Value 208,730      
CANADIAN PROPERTIES | Senior Housing | Other Senior Housing Operators        
Real Estate and Accumulated Depreciation        
Encumbrances 0      
Initial Cost to Company        
Land and Improvements 25,172      
Buildings and Improvements 146,694      
Costs Capitalized Subsequent to Acquisition (16,019)      
Gross Amount Carried at Close of Period        
Land and Improvements 22,116      
Buildings and Improvements 133,732      
Total 155,847      
Accumulated Depreciation 14,841      
Net Book Value 141,006      
CANADIAN PROPERTIES | Senior Housing | Other Senior Housing CIP        
Real Estate and Accumulated Depreciation        
Encumbrances 0      
Initial Cost to Company        
Land and Improvements 0      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at Close of Period        
Land and Improvements 0      
Buildings and Improvements 0      
Total 0      
Accumulated Depreciation 0      
Net Book Value 0      
CANADIAN PROPERTIES | Senior Housing | Le Groupe Maurice        
Real Estate and Accumulated Depreciation        
Encumbrances 1,156,570      
Initial Cost to Company        
Land and Improvements 162,989      
Buildings and Improvements 1,967,564      
Costs Capitalized Subsequent to Acquisition (63,608)      
Gross Amount Carried at Close of Period        
Land and Improvements 154,141      
Buildings and Improvements 1,912,804      
Total 2,066,945      
Accumulated Depreciation 240,019      
Net Book Value 1,826,926      
UNITED KINGDOM PROPERTIES | Senior Housing | Canford Healthcare Limited        
Real Estate and Accumulated Depreciation        
Encumbrances 0      
Initial Cost to Company        
Land and Improvements 40,481      
Buildings and Improvements 81,719      
Costs Capitalized Subsequent to Acquisition (17,264)      
Gross Amount Carried at Close of Period        
Land and Improvements 34,571      
Buildings and Improvements 70,365      
Total 104,936      
Accumulated Depreciation 20,674      
Net Book Value 84,262      
UNITED KINGDOM PROPERTIES | International Hospital | Spire Healthcare        
Real Estate and Accumulated Depreciation        
Encumbrances 0      
Initial Cost to Company        
Land and Improvements 11,903      
Buildings and Improvements 136,628      
Costs Capitalized Subsequent to Acquisition (29,206)      
Gross Amount Carried at Close of Period        
Land and Improvements 9,562      
Buildings and Improvements 109,763      
Total 119,325      
Accumulated Depreciation 24,433      
Net Book Value $ 94,892