Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
ASSETS
Operating real estate	$ 1,917,089	$ 1,659,106
Construction in progress	34,369	3,495
Held for development	14,877	24,675
Total Real estate, at cost	1,966,335	1,687,276
Accumulated depreciation	(267,840)	(234,595)
Net real estate	1,698,495	1,452,681
Cash and cash equivalents	34,917	112,723
Restricted cash	10,251	9,216
Marketable securities		28,235
Accounts receivable, net	6,076	6,847
Deferred rent receivable, net	29,392	23,294
Other assets, net	81,806	76,285
TOTAL ASSETS	1,860,937	1,709,281
LIABILITIES AND EQUITY
Secured notes payable	964,068	943,479
Line of credit	141,000
Accounts payable and accrued expenses	33,950	25,476
Security deposits payable	5,482	4,790
Other liabilities and deferred credits	61,140	55,808
Total liabilities	1,205,640	1,029,553
Commitments and contingencies (Note 10)
American Assets Trust, Inc. stockholders' equity
Common stock 0.01 par value, 490,000,000 shares authorized, 39,316,461 and 39,283,796 shares outstanding at September 30, 2012 and December 31, 2011, respectively	393	393
Additional paid-in capital	656,425	653,645
Accumulated dividends in excess of net income	(46,004)	(28,007)
Total American Assets Trust, Inc. stockholders' equity	610,814	626,031
Noncontrolling interests	44,483	53,697
Total equity	655,297	679,728
TOTAL LIABILITIES AND EQUITY	$ 1,860,937	$ 1,709,281