Dispositions and Impairment

During the nine months ended September 30, 2018 and 2017, the Company disposed of its interests in various properties for an aggregate gross disposition price of $967,799 and $190,368, respectively, and recognized aggregate gains on sales of properties of $239,577 and $55,078, respectively, including in 2018 the disposition of 21 office assets to a newly-formed joint venture with an unaffiliated third-party, NNN Office JV L.P. (“NNN JV”). See note 6. As of September 30, 2018, $256,808 of the sales proceeds, including interest thereon, were held with an EAT and are included in restricted cash on the Company's consolidated balance sheet.

During the nine months ended 2018 and 2017, the Company recognized debt satisfaction gains (charges), net of $(1,698) and $2,381, respectively, relating to sold properties. In addition, during the nine months ended September 30, 2017, the Company conveyed a vacant office property, along with its escrow deposits, in satisfaction of a $3,496 non-recourse mortgage loan.

As of September 30, 2018, the Company had six properties classified as held for sale. As of December 31, 2017, the Company had one retail property classified as held for sale. The properties were classified as held for sale because the properties were either under contract for sale and/or a sale of the property to a third party within the next 12 months was probable.

Assets and liabilities of held for sale properties as of September 30, 2018 and December 31, 2017 consisted of the following:



	September 30, 2018			December 31, 2017
Assets:
Real estate, at cost	$	125,878		$	2,827
Real estate, intangible assets	15,352			—
Accumulated depreciation and amortization	(13,881		)	—
Rent receivable - deferred	4,897			—
Other	2,498			—
	$	134,744		$	2,827

Liabilities:
Accounts payable and other liabilities	$	162		$	—
Prepaid rent	546			—
Deferred rent - below market lease, net	738			—
	$	1,446		$	—

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, change in the estimated holding period of the asset 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 and the Company estimates that its cost will not be recovered. During the nine months ended September 30, 2018 and 2017, the Company recognized aggregate impairment charges on real estate properties of $90,860 and $38,283, respectively. Included in the impairment charges recognized during the nine months ended September 30, 2018, are impairment charges of $17,906 recognized on an office property in Overland Park, Kansas, $5,591 recognized on an office property in Kansas City, Missouri and $25,585 on an unencumbered office property in Memphis, Tennessee. The Overland Park, Kansas and Kansas City, Missouri properties are encumbered at September 30, 2018 by an aggregate of $47,685 of non-recourse mortgage loans, which are $25,060 in excess of the properties' estimated impairment date fair value. The Memphis, Tennessee property was classified as held for sale at September 30, 2018.

In February 2017, the Company recognized a $5,294 loan loss on the assignment of a loan receivable secured by a hospital in Kennewick, Washington.