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Accounts payable, accrued expenses, and other liabilities
 6 Months Ended
Jun. 30, 2024
Accounts Payable and Accrued Liabilities [Abstract]  
Accounts payable, accrued expenses, and other liabilities The following table summarizes the components of accounts payable, accrued expenses, and other liabilities as of June 30,
2024 and December 31, 2023 (in thousands):
June 30, 2024
December 31, 2023
Accounts payable and accrued expenses
$434,668
$524,439
Accrued construction
612,663
606,333
Acquired below-market leases
267,137
322,040
Conditional asset retirement obligations
55,709
53,083
Deferred rent liabilities
12,223
15,183
Operating lease liability
379,223
382,883
Unearned rent and tenant security deposits
583,625
548,529
Other liabilities
184,287
158,453
Total
$2,529,535
$2,610,943
As of June 30, 2024 and December 31, 2023, our conditional asset retirement obligations liability primarily consisted of the soil
and groundwater remediation liabilities associated with certain of our properties. Some of our properties may contain asbestos or may
be subjected to other hazardous or toxic substances, which, under certain conditions, requires remediation. We engage independent
environmental consultants to conduct Phase I or similar environmental assessments at our properties. This type of assessment
generally includes a site inspection, interviews, and a public records review; asbestos, lead-based paint, and mold surveys; subsurface
sampling; and other testing. We recognize a liability for the fair value of a conditional asset retirement obligation (including asbestos)
when the fair value of the liability can be reasonably estimated. In addition, environmental laws and regulations subject our tenants, and
potentially us, to liability that may result from our tenants’ routine handling of hazardous substances and wastes as part of their
operations at our properties. These assessments and investigations of our properties have not to date revealed any additional
environmental liability we believe would have a material adverse effect on our business and financial statements or that would require
additional disclosures or recognition in our consolidated financial statements.