Accounts payable, accrued expenses, and tenant security deposits

9 Months Ended

Sep. 30, 2015

Accounts payable, accrued expenses, and tenant security deposits [Abstract]

Accounts payable, accrued expenses, and tenant security deposits

The following table summarizes the components of accounts payable, accrued expenses, and tenant security deposits as of September 30, 2015, and December 31, 2014 (in thousands):



	September 30, 2015		December 31, 2014
Accounts payable and accrued expenses	$	143,556	$	127,828
Accrued construction	83,805		91,110
Acquired below-market leases	27,072		8,810
Conditional asset retirement obligations	7,828		9,108
Deferred rent liabilities	27,300		36,231
Interest rate swap liabilities	8,679		909
Unearned rent and tenant security deposits	209,584		193,699
Other liabilities ⁽¹⁾	78,770		21,390
Total	$	586,594	$	489,085


(1)	Balance as of September 30, 2015. includes a $54.0 million liability related to the second installment payment for our acquisition of the remaining noncontrolling interest in our 1.2 million RSF campus at Alexandria Technology Square^®. For additional information, refer to Note 11 – “Noncontrolling Interests” to our unaudited consolidated financial statements under Item 1 of this report.