Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
ASSETS
Operating real estate	$ 1,891,549	$ 1,600,643
Construction in progress	32,183	3,495
Held for development	14,944	24,675
Total Real estate, at cost	1,938,676	1,628,813
Accumulated depreciation	(270,494)	(224,867)
Net real estate	1,668,182	1,403,946
Cash and cash equivalents	42,479	112,723
Restricted cash	7,421	8,978
Marketable securities		28,235
Accounts receivable, net	6,440	6,810
Deferred rent receivables, net	29,395	22,344
Prepaid expenses and other assets	73,670	74,424
Assets of discontinued operations		51,821
TOTAL ASSETS	1,827,587	1,709,281
LIABILITIES AND EQUITY
Secured notes payable	1,044,682	912,067
Accounts payable and accrued expenses	29,509	24,805
Security deposits payable	4,856	4,091
Other liabilities and deferred credits	62,811	55,579
Liabilities of discontinued operations		33,011
Total liabilities	1,141,858	1,029,553
Commitments and contingencies (Note 12)
American Assets Trust, Inc. stockholders' equity
Common stock $0.01 par value, 490,000,000 shares authorized, 39,664,212 and 39,283,796 shares outstanding at December 31, 2012 and December 31, 2011 respectively	397	393
Additional paid-in capital	663,589	653,645
Accumulated dividends in excess of net income	(25,625)	(28,007)
Total American Assets Trust, Inc. stockholders' equity	638,361	626,031
Noncontrolling interests	47,368	53,697
Total equity	685,729	679,728
TOTAL LIABILITIES AND EQUITY	$ 1,827,587	$ 1,709,281