Our portfolio of marketable securities is comprised of equity securities that are classified as available-for-sale. Available-for-sale securities are presented on our consolidated balance sheets at fair value. Unrealized gains and losses resulting from the mark-to-market of these securities are included in “other comprehensive income (loss).” Realized gains and losses are recognized in earnings only upon the sale of the securities and are recorded based on the weighted average cost of such securities.

We evaluate our portfolio of marketable securities for impairment each reporting period. For each of the securities in our portfolio with unrealized losses, we review the underlying cause of the decline in value and the estimated recovery period, as well as the severity and duration of the decline. In our evaluation, we consider our ability and intent to hold these investments for a reasonable period of time sufficient for us to recover our cost basis. We also evaluate the near-term prospects for each of these investments in relation to the severity and duration of the decline.

	Below is a summary of our marketable securities portfolio as of December 31, 2013 and 2012.

		As of December 31, 2013						As of December 31, 2012
				GAAP		Unrealized				GAAP		Unrealized
		Fair Value		Cost		Gain		Fair Value		Cost		Gain
Equity securities:
	Lexington	$	188,567	$	72,549	$	116,018	$	-	$	-	$	-
	J.C. Penney		-		-		-		366,291		366,291		-
	Other		3,350		59		3,291		31,897		12,465		19,432
		$	191,917	$	72,608	$	119,309	$	398,188	$	378,756	$	19,432

From the inception of our investment in Lexington in 2008, until the first quarter of 2013, we accounted for our investment under the equity method because of our ability to exercise significant influence over Lexington's operating and financial policies. As a result of Lexington's common share issuances, our ownership interest was reduced over time from approximately 17.2% to 8.8% at March 31, 2013. In the first quarter of 2013, we concluded that we no longer have the ability to exercise significant influence over Lexington's operating and financial policies, and began accounting for this investment as a marketable equity security – available for sale, in accordance with ASC Topic 320, Investments – Debt and Equity Securities.

At December 31, 2012, we owned 23,400,000 J.C. Penney common shares comprised of (i) 18,584,010 common shares at a GAAP cost of $19.71 per share, or $366,291,000 in the aggregate, and (ii) 4,815,990 common shares through a forward contract at a weighted average strike price of $29.34 per share, or $141,309,000 in the aggregate.

On March 4, 2013, we sold 10,000,000 J.C. Penney common shares at a price of $16.03 per share, or $160,300,000 in the aggregate, resulting in a net loss of $36,800,000, which is included in “net gain on disposition of wholly owned and partially owned assets” on our consolidated statements of income. In addition, in the first quarter of 2013, we wrote down the remaining 8,584,010 J.C. Penney common shares we owned to fair value, based on J.C. Penney's March 31, 2013 closing share price of $15.11 per share, and recorded a $39,487,000 impairment loss, which is included in “interest and other investment (loss) income, net” on our consolidated statements of income.

On September 19, 2013, we settled the forward contract and received 4,815,990 J.C. Penney common shares. In connection therewith, we recognized a $33,487,000 loss from the mark-to-market of the derivative position through its settlement date, which is included in “interest and other investment (loss) income, net” on our consolidated statements of income.

On September 19, 2013, we also sold the remaining 13,400,000 J.C. Penney common shares in a block trade at a price of $13.00 per share, or $174,200,000 in the aggregate and recognized an $18,114,000 net loss, which is included in “net gain on disposition of wholly owned and partially owned assets” on our consolidated statements of income.

The aggregate economic net loss on our investment in J.C. Penney, from inception through disposition, was $256,156,000.

During 2013, 2012 and 2011, we sold other marketable securities for aggregate proceeds of $44,209,000, $58,718,000, and $69,559,000, respectively resulting in net gains of $31,741,000, $3,582,000, and $5,020,000, respectively, which are included as a component of “net gain on disposition of wholly owned and partially owned assets” on our consolidated statements of income.