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Investments in and Advances to Unconsolidated Joint Ventures (Tables)
 12 Months Ended
Dec. 31, 2022
Equity Method Investments and Joint Ventures [Abstract]  
Schedule of Company Owned Interests in Entities, Accounted Under Equity Method
The Company owns interests in the following entities that are accounted for under the equity method, excluding investments classified as discontinued operations (dollars in thousands):
   Carrying Amount
   December 31,
Entity(1)
Segment
Property Count(2)
Ownership %(2)
20222021
SWF SH JVOther1954$345,978 $355,394 
South San Francisco JVs(3)
Life science770309,969 — 
Life Science JVLife science14926,601 25,605 
Needham Land Parcel JV(4)
Life science—3815,391 13,566 
Medical Office JVs(5)
Medical office3
20 - 67
8,738 9,069 
   $706,677 $403,634 
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(1)These entities are not consolidated because the Company does not control, through voting rights or other means, the joint ventures.
(2)Property counts and ownership percentages are as of December 31, 2022.
(3)Includes seven unconsolidated life science joint ventures in South San Francisco, California in which the Company holds a 70% ownership percentage in each joint venture. These joint ventures have been aggregated herein due to similarity of the investments and operations. See “South San Francisco Joint Ventures” below for further information.
(4)In December 2021, the Company acquired a 38% interest in a life science development joint venture in Needham, Massachusetts for $13 million. Land held for development is excluded from the property count as of December 31, 2022.
(5)Includes two unconsolidated medical office joint ventures in which the Company holds an ownership percentage as follows: (i) Ventures IV (20%) and (ii) Suburban Properties, LLC (67%). During 2021, the Company also held a 30% interest in Ventures III, which issued its final distribution and was dissolved. These joint ventures have been aggregated herein due to similarity of the investments and operations.