Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Assets
Operating real estate	$ 1,696,044	$ 1,659,106
Construction in progress	4,786	3,495
Held for development	25,354	24,675
Total Real estate, at cost	1,726,184	1,687,276
Accumulated depreciation	(245,717)	(234,595)
Net real estate	1,480,467	1,452,681
Cash and cash equivalents	100,652	112,723
Restricted cash	10,179	9,216
Marketable securities	26,326	28,235
Accounts receivable, net	5,313	6,847
Deferred rent receivables, net	25,073	23,294
Other assets, net	74,461	76,285
Total assets	1,722,471	1,709,281
Liabilities and equity
Secured notes payable	964,942	943,479
Accounts payable and accrued expenses	25,922	25,476
Security deposits payable	4,801	4,790
Other liabilities and deferred credits	55,621	55,808
Total liabilities	1,051,286	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, 39,284,593 and 39,283,796 shares outstanding at March 31, 2012 and December 31, 2011, respectively	393	393
Additional paid-in capital	654,344	653,645
Accumulated dividends in excess of net income	(34,269)	(28,007)
Total American Assets Trust, Inc. stockholders' equity	620,468	626,031
Noncontrolling interests	50,717	53,697
Total equity	671,185	679,728
Total liabilities and equity	$ 1,722,471	$ 1,709,281