Property Dispositions and Real Estate Impairment

During the nine months ended September 30, 2017, the Company disposed of its interests in various properties for an aggregate gross sale price of $190,368 and conveyed a vacant office property, along with its escrow deposits, in satisfaction of a $3,496 non-recourse mortgage loan. During the nine months ended September 30, 2016, the Company disposed of its interests in various properties, including land investments, for an aggregate gross sale price of $561,817 and conveyed a vacant office property, along with its escrow deposits, in satisfaction of a $14,118 non-recourse mortgage loan; however, the lender brought a claim under the related non-recourse carve out guaranty (see note 13).

During the nine months ended September 30, 2017 and 2016, the Company recognized aggregate gains on sales of properties of $55,078 and $58,413, respectively. In addition, during the nine months ended September 30, 2017 and 2016, the Company recognized debt satisfaction gains (charges), net of $2,381 and $(381), respectively, relating to properties disposed of, including conveyed properties.

As of September 30, 2017 and December 31, 2016, the Company had one property and two properties, respectively, classified as held for sale.

Assets and liabilities of held for sale properties as of September 30, 2017 and December 31, 2016 consisted of the following:



	September 30, 2017		December 31, 2016
Assets:
Real estate, at cost	$	8,607	$	25,957
Real estate, intangible assets	—		7,789
Accumulated depreciation and amortization	—		(13,346		)
Rent receivable - current	11		—
Rent receivable - deferred	—		1,715
Other assets	20		1,693
	$	8,638	$	23,808

Liabilities:
Other	$	442	$	191
	$	442	$	191

The Company assesses on a regular basis whether there are any indicators that the carrying value of its real estate assets may be impaired. Potential indicators may include an increase in vacancy at a property, tenant financial instability and the potential sale or transfer of the property in the near future. An asset is determined to be impaired if the asset's carrying value is in excess of its estimated fair value. During the nine months ended September 30, 2017 and 2016, the Company recognized aggregate impairment charges of $38,283 and $75,904, respectively, on properties disposed of and properties held for use.