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Accounts payable, accrued expenses, and other liabilities
 9 Months Ended
Sep. 30, 2023
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 September 30, 2023 and December 31, 2022 (in thousands):
September 30, 2023December 31, 2022
Accounts payable and accrued expenses$516,414 $389,741 
Accrued construction706,900 624,440 
Acquired below-market leases346,420 417,656 
Conditional asset retirement obligations54,161 52,723 
Deferred rent liabilities15,650 18,321 
Operating lease liability384,958 406,700 
Unearned rent and tenant security deposits503,126 449,622 
Other liabilities125,497 112,056 
Total$2,653,126 $2,471,259 

As of September 30, 2023 and December 31, 2022, 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.