American Assets Trust (AAT) 10-K 15 Feb 19 2018 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2018	Feb. 15, 2019	Jun. 30, 2018
Document Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	FY
Trading Symbol	AAT
Entity Registrant Name	AMERICAN ASSETS TRUST, INC.
Entity Central Index Key	1,500,217
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		47,325,507
Entity Public Float			$ 1,559,900,000
American Assets Trust, L.P.
Document Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	FY
Entity Registrant Name	AMERICAN ASSETS TRUST, L.P.
Entity Central Index Key	1,509,570
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Non-accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		0
Entity Public Float			$ 0

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands		Dec. 31, 2018	Dec. 31, 2017
ASSETS
Operating real estate		$ 2,549,571	$ 2,536,474
Construction in progress		71,228	68,272
Held for development		9,392	9,392
Total Real estate, at cost		2,630,191	2,614,138
Accumulated depreciation		(590,338)	(537,431)
Net real estate		2,039,853	2,076,707
Cash and cash equivalents		47,956	82,610
Restricted cash		9,316	9,344
Accounts receivable, net		9,289	9,869
Deferred rent receivables, net		39,815	38,973
Other assets, net		52,021	42,361
TOTAL ASSETS		2,198,250	2,259,864
LIABILITIES AND EQUITY
Secured notes payable		182,572	279,550
Unsecured notes payable		1,045,863	1,045,470
Unsecured line of credit		62,337	0
Accounts payable and accrued expenses		46,616	38,069
Security deposits payable		8,844	6,570
Other liabilities and deferred credits		49,547	46,061
Total liabilities		1,395,779	1,415,720
Commitments and contingencies (Note 12)
American Assets Trust, Inc. stockholders' equity
Common stock, $0.01 par value, 490,000,000 shares authorized, 47,335,409 and 47,204,588 shares issued and outstanding at December 31, 2018 and December 31, 2017, respectively		474	473
Additional paid-in capital		920,661	919,066
Accumulated dividends in excess of net income		(128,778)	(97,280)
Accumulated other comprehensive income		10,620	11,451
Total American Assets Trust, Inc. stockholders' equity		802,977	833,710
Noncontrolling interests		(506)	10,434
Total equity		802,471	844,144
TOTAL LIABILITIES AND EQUITY		2,198,250	2,259,864
American Assets Trust, L.P.
ASSETS
Operating real estate		2,549,571	2,536,474
Construction in progress		71,228	68,272
Held for development		9,392	9,392
Total Real estate, at cost		2,630,191	2,614,138
Accumulated depreciation		(590,338)	(537,431)
Net real estate		2,039,853	2,076,707
Cash and cash equivalents		47,956	82,610
Restricted cash		9,316	9,344
Accounts receivable, net		9,289	9,869
Deferred rent receivables, net		39,815	38,973
Other assets, net		52,021	42,361
TOTAL ASSETS		2,198,250	2,259,864
LIABILITIES AND EQUITY
Secured notes payable		182,572	279,550
Unsecured notes payable		1,045,863	1,045,470
Unsecured line of credit		62,337	0
Accounts payable and accrued expenses		46,616	38,069
Security deposits payable		8,844	6,570
Other liabilities and deferred credits		49,547	46,061
Total liabilities		1,395,779	1,415,720
American Assets Trust, Inc. stockholders' equity
Accumulated other comprehensive income		14,591
TOTAL LIABILITIES AND EQUITY		2,198,250	2,259,864
Partners' Capital [Abstract]
Limited partners' capital, 17,177,608 and 17,194,980 units issued and outstanding as of December 31, 2018 and December 31, 2017, respectively		(4,477)
General partner's capital, 47,335,409 and 47,204,588 units issued and outstanding as of December 31, 2018 and December 31, 2017, respectively		792,357
Total capital		802,471	844,144
Limited Partner | American Assets Trust, L.P.
Partners' Capital [Abstract]
Limited partners' capital, 17,177,608 and 17,194,980 units issued and outstanding as of December 31, 2018 and December 31, 2017, respectively			6,135
Total capital	[1]	(4,477)	6,135
General Partner | American Assets Trust, L.P.
Partners' Capital [Abstract]
General partner's capital, 47,335,409 and 47,204,588 units issued and outstanding as of December 31, 2018 and December 31, 2017, respectively			822,259
Total capital	[2]	792,357	822,259
Accumulated Other Comprehensive Income (Loss) | American Assets Trust, L.P.
American Assets Trust, Inc. stockholders' equity
Accumulated other comprehensive income			15,750
Partners' Capital [Abstract]
Total capital		$ 14,591	$ 15,750
[1]	Consists of limited partnership interests held by third parties.
[2]	Consists of general and limited partnership interests held by American Assets Trust, Inc.

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2018	Dec. 31, 2017
American Assets Trust, L.P.
Limited Partners' Capital Account, Units Issued	17,177,608	17,194,980
Limited Partners' Capital Account, Units Outstanding	17,177,608	17,194,980
General Partners' Capital Account, Units Issued	47,335,409	47,204,588
General Partners' Capital Account, Units Outstanding	47,335,409	47,204,588
Common Stock
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	490,000,000	490,000,000
Common stock, shares issued	47,335,409	47,204,588
Common stock, shares outstanding	47,335,409	47,204,588

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2016
REVENUE:
Rental income	$ 309,537	$ 298,803		$ 279,498
Other property income	21,330	16,180		15,590
Total revenue	330,867	314,983		295,088
EXPENSES:
Rental expenses	86,482	84,006		79,553
Real estate taxes	34,973	32,671		28,378
General and administrative	22,784	21,382		17,897
Depreciation and amortization	107,093	83,278		71,319
Total operating expenses	251,332	221,337		197,147
Operating income (loss)	79,535	93,646		97,941
Interest expense	(52,248)	(53,848)		(51,936)
Other income (expense), net	(85)	334		(368)
Net income	27,202	40,132		45,637
Net income attributable to restricted shares	(311)	(241)		(189)
Net income attributable to unitholders in the Operating Partnership	(7,205)	(10,814)		(12,863)
NET INCOME ATTRIBUTABLE TO AMERICAN ASSETS TRUST, INC. STOCKHOLDERS	$ 19,686	$ 29,077		$ 32,585
EARNINGS PER COMMON SHARE, BASIC
Basic net income attributable to common stockholders per share (in dollars per share)	$ 0.42	$ 0.62		$ 0.72
Weighted average shares of common stock outstanding-basic (in shares)	46,950,812	46,715,520		45,332,471
EARNINGS PER COMMON SHARE, DILUTED
Diluted net income attributable to common stockholders per share (in dollars per share)	$ 0.42	$ 0.62		$ 0.72
Weighted average shares of common stock outstanding-diluted (in shares)	64,136,559	64,087,250		63,228,159
COMPREHENSIVE INCOME
Net income	$ 27,202	$ 40,132		$ 45,637
Other comprehensive gain - unrealized gain on swap derivative during the period	120	386		17,048
Reclassification of amortization of forward starting swap included in interest expense	(1,279)	(1,114)		(231)
Comprehensive income	26,043	39,404		62,454
Comprehensive income attributable to noncontrolling interest	(6,877)	(10,433)		(17,624)
Comprehensive income attributable to American Assets Trust, Inc.	19,166	28,971		44,830
American Assets Trust, L.P.
REVENUE:
Rental income	309,537	298,803		279,498
Other property income	21,330	16,180		15,590
Total revenue	330,867	314,983		295,088
EXPENSES:
Rental expenses	86,482	84,006		79,553
Real estate taxes	34,973	32,671		28,378
General and administrative	22,784	21,382		17,897
Depreciation and amortization	107,093	83,278		71,319
Total operating expenses	251,332	221,337		197,147
Operating income (loss)	79,535	93,646		97,941
Interest expense	(52,248)	(53,848)		(51,936)
Other income (expense), net	(85)	334		(368)
Net income	27,202	40,132		45,637
Net income attributable to restricted shares	(311)	(241)		(189)
NET INCOME ATTRIBUTABLE TO AMERICAN ASSETS TRUST, INC. STOCKHOLDERS	$ 26,891	$ 39,891		$ 45,448
EARNINGS PER COMMON SHARE, BASIC
Basic net income attributable to common stockholders per share (in dollars per share)	$ 0.42	$ 0.62		$ 0.72
Weighted average shares of common stock outstanding-basic (in shares)	64,136,559	64,087,250		63,228,159
EARNINGS PER COMMON SHARE, DILUTED
Diluted net income attributable to common stockholders per share (in dollars per share)	$ 0.42	$ 0.62		$ 0.72
Weighted average shares of common stock outstanding-diluted (in shares)	64,136,559	64,087,250		63,228,159
DISTRIBUTIONS PER UNIT (in dollars per share)	$ 1.09	$ 1.05		$ 1.01
COMPREHENSIVE INCOME
Net income	$ 27,202	$ 40,132		$ 45,637
Other comprehensive gain - unrealized gain on swap derivative during the period	120	386		17,048
Reclassification of amortization of forward starting swap included in interest expense	(1,279)	(1,114)		(231)
Comprehensive income	26,043	39,404		62,454
American Assets Trust, L.P. | Limited Partner
EXPENSES:
Net income	7,205	10,814	[1]	12,863	[1]
COMPREHENSIVE INCOME
Net income	7,205	10,814	[1]	12,863	[1]
Comprehensive income attributable to American Assets Trust, Inc.	(6,877)	(10,433)		(17,624)
American Assets Trust, L.P. | General Partner
EXPENSES:
Net income	19,997	29,318	[2]	32,774	[2]
COMPREHENSIVE INCOME
Net income	19,997	29,318	[2]	32,774	[2]
Comprehensive income attributable to American Assets Trust, Inc.	19,166	28,971		44,830
Swap
COMPREHENSIVE INCOME
Other comprehensive gain - unrealized gain on swap derivative during the period	120	(10,281)		17,048
Swap | American Assets Trust, L.P.
COMPREHENSIVE INCOME
Other comprehensive gain - unrealized gain on swap derivative during the period	$ 120	(10,281)		$ 17,048
Forward Contracts
COMPREHENSIVE INCOME
Other comprehensive gain - unrealized gain on swap derivative during the period		10,667
Forward Contracts | American Assets Trust, L.P.
COMPREHENSIVE INCOME
Other comprehensive gain - unrealized gain on swap derivative during the period		$ 10,667
[1]	Consists of limited partnership interests held by third parties.
[2]	Consists of general and limited partnership interests held by American Assets Trust, Inc.

Consolidated Statements of Equi

Consolidated Statements of Equity - USD ($) $ in Thousands		Total	American Assets Trust, L.P.	Limited PartnerAmerican Assets Trust, L.P.		General PartnerAmerican Assets Trust, L.P.		Accumulated Other Comprehensive Income (Loss)American Assets Trust, L.P.	Swap	SwapAmerican Assets Trust, L.P.	SwapAccumulated Other Comprehensive Income (Loss)American Assets Trust, L.P.	Forward Contracts	Forward ContractsAmerican Assets Trust, L.P.	Forward ContractsAccumulated Other Comprehensive Income (Loss)American Assets Trust, L.P.	Common Stock	Common StockAmerican Assets Trust, L.P.	Additional Paid-in Capital	Accumulated dividends in excess of net income	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss)Swap	Accumulated Other Comprehensive Income (Loss)Forward Contracts	Noncontrolling Interests - Unitholders in the Operating Partnership	Noncontrolling Interests - Unitholders in the Operating PartnershipSwap	Noncontrolling Interests - Unitholders in the Operating PartnershipForward Contracts
Beginning balance (in shares) at Dec. 31, 2015															45,407,719
Beginning balance at Dec. 31, 2015		$ 828,927													$ 454		$ 863,432	$ (64,066)	$ (258)			$ 29,365
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		45,637	$ 45,637	$ 12,863	[1]	$ 32,774	[2]											32,774				12,863
Common shares issued (in shares)															219,480
Common shares issued		9,640													$ 2		9,638
Issuance of restricted stock (in shares)															148,110
Issuance of restricted stock		0													$ 1		(1)
Forfeiture of restricted stock (in shares)															(33,707)
Forfeiture of restricted stock		0													$ 0		0
Conversion of operating partnership units (in shares)															10,694	10,694
Conversion of operating partnership units		0															(79)					79
Dividends declared and paid		(64,077)																(46,004)
Dividends declared and paid (noncontrolling interest)																						18,073
Stock-based compensation		2,414															2,414
Shares withheld for employee taxes (in shares)						(20,187)	[2]								(20,187)
Shares withheld for employee taxes		(807)	(807)			$ (807)	[2]								$ 0		(807)
Other comprehensive income (loss) unrealized gain (loss) on derivatives		17,048	17,048						$ 17,048	$ 17,048	$ 17,048									$ 12,222			$ 4,826
Reclassification of amortization of forward starting swap included in interest expense		231	231					$ 231											166			65
Ending balance (in shares) at Dec. 31, 2016															45,732,109
Ending balance at Dec. 31, 2016		838,551													$ 457		874,597	(77,296)	11,798			28,995
Beginning balance (in shares) at Dec. 31, 2015				17,899,516	[1]	45,407,719	[2]
Beginning balance at Dec. 31, 2015			828,927	$ 29,446	[1]	$ 799,820	[2]	(339)
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income		45,637	45,637	$ 12,863	[1]	$ 32,774	[2]											32,774				12,863
Contributions from American Assets Trust, Inc. (in shares)	[2]					219,480
Contributions from American Assets Trust, Inc.			9,640			$ 9,640	[2]
Conversion of operating partnership units (in shares)				(10,694)	[1]	10,694	[2]
Conversion of operating partnership units				$ 79	[1]	$ (79)	[2]
Issuance of restricted units (in shares)	[2]					148,110
Forfeiture of restricted units (in shares)	[2]					(33,707)
Distributions			(64,077)	$ (18,073)	[1]	$ (46,004)	[2]
Stock-based compensation			2,414			$ 2,414	[2]
Shares withheld for employee taxes (in shares)						(20,187)	[2]								(20,187)
Units withheld for employee taxes		(807)	(807)			$ (807)	[2]								$ 0		(807)
Other comprehensive income (loss) unrealized gain (loss) on derivatives		17,048	17,048						17,048	17,048	17,048									12,222			4,826
Reclassification of amortization of forward starting swap included in interest expense		231	231					231											166			65
Ending balance (in shares) at Dec. 31, 2016				17,888,822	[1]	45,732,109	[2]
Ending balance at Dec. 31, 2016			838,551	$ 24,315	[1]	$ 797,758	[2]	16,478
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		40,132	40,132	10,814	[1]	$ 29,318	[2]											29,318				10,814
Common shares issued (in shares)															700,000
Common shares issued		29,873													$ 7		29,866
Issuance of restricted stock (in shares)															150,098
Issuance of restricted stock		0													$ 2		(2)
Forfeiture of restricted stock (in shares)															(48,624)
Forfeiture of restricted stock		0													$ 0		0
Conversion of operating partnership units (in shares)															693,842	693,842
Conversion of operating partnership units		0													$ 7		10,752					(10,759)
Dividends declared and paid		(67,537)																(49,302)
Dividends declared and paid (noncontrolling interest)																						18,235
Stock-based compensation		4,735															4,735
Shares withheld for employee taxes (in shares)						(22,837)	[2]								(22,837)
Shares withheld for employee taxes		(882)	(882)			$ (882)	[2]								$ 0		(882)
Other comprehensive income (loss) unrealized gain (loss) on derivatives		386	386						(10,281)	(10,281)	(10,281)	$ 10,667	$ 10,667	$ 10,667						(7,310)	$ 7,775		(2,971)	$ 2,892
Reclassification of amortization of forward starting swap included in interest expense		1,114	1,114					1,114											812			302
Ending balance (in shares) at Dec. 31, 2017															47,204,588
Ending balance at Dec. 31, 2017		844,144													$ 473		919,066	(97,280)	11,451			10,434
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income		40,132	40,132	$ 10,814	[1]	$ 29,318	[2]											29,318				10,814
Contributions from American Assets Trust, Inc. (in shares)	[2]					700,000
Contributions from American Assets Trust, Inc.			29,873			$ 29,873	[2]
Conversion of operating partnership units (in shares)				(693,842)	[1]	693,842	[2]
Conversion of operating partnership units				$ (10,759)	[1]	$ 10,759	[2]
Issuance of restricted units (in shares)	[2]					150,098
Forfeiture of restricted units (in shares)	[2]					(48,624)
Distributions			(67,537)	$ (18,235)	[1]	$ (49,302)	[2]
Stock-based compensation			4,735			$ 4,735	[2]
Shares withheld for employee taxes (in shares)						(22,837)	[2]								(22,837)
Units withheld for employee taxes		(882)	(882)			$ (882)	[2]								$ 0		(882)
Other comprehensive income (loss) unrealized gain (loss) on derivatives		386	386						(10,281)	(10,281)	(10,281)	$ 10,667	$ 10,667	$ 10,667						(7,310)	$ 7,775		(2,971)	$ 2,892
Reclassification of amortization of forward starting swap included in interest expense		1,114	1,114					1,114											812			302
Ending balance (in shares) at Dec. 31, 2017				17,194,980	[1]	47,204,588	[2]
Ending balance at Dec. 31, 2017			844,144	$ 6,135	[1]	$ 822,259	[2]	15,750
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		27,202	27,202	7,205		$ 19,997												19,997				7,205
Issuance of restricted stock (in shares)															205,110
Issuance of restricted stock		0													$ 2		(2)
Forfeiture of restricted stock (in shares)															(78,975)
Forfeiture of restricted stock		0													$ (1)		1
Conversion of operating partnership units (in shares)															17,372	17,372
Conversion of operating partnership units		0													$ 0		(916)					916
Dividends declared and paid		(70,228)																(51,495)
Dividends declared and paid (noncontrolling interest)																						18,733
Stock-based compensation		3,039															3,039
Shares withheld for employee taxes (in shares)						(12,686)									(12,686)
Shares withheld for employee taxes		(527)	(527)			$ (527)									$ 0		(527)
Other comprehensive income (loss) unrealized gain (loss) on derivatives		120	120						120	120	120									105			15
Reclassification of amortization of forward starting swap included in interest expense		1,279	1,279					1,279											936			343
Ending balance (in shares) at Dec. 31, 2018															47,335,409
Ending balance at Dec. 31, 2018		802,471													$ 474		920,661	(128,778)	10,620			(506)
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income		27,202	27,202	$ 7,205		$ 19,997												$ 19,997				7,205
Conversion of operating partnership units (in shares)				(17,372)		17,372
Conversion of operating partnership units				$ 916		$ (916)
Issuance of restricted units (in shares)						205,110
Forfeiture of restricted units (in shares)						(78,975)
Distributions			(70,228)	$ (18,733)		$ (51,495)
Stock-based compensation			3,039			$ 3,039
Shares withheld for employee taxes (in shares)						(12,686)									(12,686)
Units withheld for employee taxes		(527)	(527)			$ (527)									$ 0		$ (527)
Other comprehensive income (loss) unrealized gain (loss) on derivatives		120	120						$ 120	$ 120	$ 120									$ 105			$ 15
Reclassification of amortization of forward starting swap included in interest expense		$ 1,279	1,279					1,279											$ 936			$ 343
Ending balance (in shares) at Dec. 31, 2018				17,177,608	[1]	47,335,409	[2]
Ending balance at Dec. 31, 2018			$ 802,471	$ (4,477)	[1]	$ 792,357	[2]	$ 14,591
[1]	Consists of limited partnership interests held by third parties.
[2]	Consists of general and limited partnership interests held by American Assets Trust, Inc.

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
OPERATING ACTIVITIES
Net income	$ 27,202	$ 40,132	$ 45,637
Adjustments to reconcile net income to net cash provided by operating activities:
Deferred rent revenue and amortization of lease intangibles	(1,157)	(2,547)	(2,637)
Depreciation and amortization	107,093	83,278	71,319
Amortization of debt issuance costs and debt fair value adjustments	1,530	3,058	4,473
Stock-based compensation expense	3,039	4,735	2,414
Settlement of forward interest rate swap agreement	0	10,667	0
Other noncash interest expense	(1,279)	(1,114)	(231)
Other, net	383	901	(769)
Changes in operating assets and liabilities
Change in accounts receivable	(336)	(1,116)	(2,347)
Change in other assets	(227)	(499)	(982)
Change in accounts payable and accrued expenses	(3,297)	7,632	1,371
Change in security deposits payable	2,274	456	158
Change in other liabilities and deferred credits	1,282	270	2,275
Net cash provided by operating activities	136,507	145,853	120,681
INVESTING ACTIVITIES
Acquisition of real estate, net	0	278,141	0
Capital expenditures	(54,411)	(47,496)	(59,633)
Leasing commissions	(9,936)	(4,927)	(3,572)
Net cash used in investing activities	(64,347)	(330,564)	(63,205)
FINANCING ACTIVITIES
Repayment of secured notes payable	(97,124)	(167,139)	(136,974)
Proceeds from unsecured term loan	0	0	150,000
Proceeds from unsecured line of credit	84,000	173,000	34,000
Repayment of unsecured line of credit	20,000	193,000	44,000
Proceeds from issuance of unsecured notes payable	0	450,000	0
Debt issuance costs	(2,727)	(2,401)	(2,055)
Proceeds from issuance of common stock, net	(236)
Proceeds from issuance of common stock, net		29,873	9,640
Dividends paid to common stock and unitholders	(70,228)	(67,537)	(64,077)
Shares withheld for employee taxes	(527)	(882)	(807)
Net cash provided by (used in) financing activities	(106,842)	221,914	(54,273)
Net (decrease) increase in cash and cash equivalents	(34,682)	37,203	3,203
Cash, cash equivalents and restricted cash, beginning of year	91,954	54,751	51,548
Cash, cash equivalents and restricted cash, end of year	57,272	91,954	54,751
Cash and cash equivalents	47,956	82,610	44,801
Restricted cash	9,316	9,344	9,950
American Assets Trust, L.P.
OPERATING ACTIVITIES
Net income	27,202	40,132	45,637
Adjustments to reconcile net income to net cash provided by operating activities:
Deferred rent revenue and amortization of lease intangibles	(1,157)	(2,547)	(2,637)
Depreciation and amortization	107,093	83,278	71,319
Amortization of debt issuance costs and debt fair value adjustments	1,530	3,058	4,473
Stock-based compensation expense	3,039	4,735	2,414
Settlement of forward interest rate swap agreement	0	10,667	0
Other noncash interest expense	(1,279)	(1,114)	(231)
Other, net	383	901	(769)
Changes in operating assets and liabilities
Change in accounts receivable	(336)	(1,116)	(2,347)
Change in other assets	(227)	(499)	(982)
Change in accounts payable and accrued expenses	(3,297)	7,632	1,371
Change in security deposits payable	2,274	456	158
Change in other liabilities and deferred credits	1,282	270	2,275
Net cash provided by operating activities	136,507	145,853	120,681
INVESTING ACTIVITIES
Acquisition of real estate, net	0	278,141	0
Capital expenditures	(54,411)	(47,496)	(59,633)
Leasing commissions	(9,936)	(4,927)	(3,572)
Net cash used in investing activities	(64,347)	(330,564)	(63,205)
FINANCING ACTIVITIES
Repayment of secured notes payable	(97,124)	(167,139)	(136,974)
Proceeds from unsecured term loan	0	0	150,000
Proceeds from unsecured line of credit	84,000	173,000	34,000
Repayment of unsecured line of credit	20,000	193,000	44,000
Proceeds from issuance of unsecured notes payable	0	450,000	0
Debt issuance costs	(2,727)	(2,401)	(2,055)
Proceeds from issuance of common stock, net	(236)
Contributions from American Assets Trust, Inc.		29,873	9,640
Dividends paid to common stock and unitholders	(70,228)	(67,537)	(64,077)
Shares withheld for employee taxes	(527)	(882)	(807)
Net cash provided by (used in) financing activities	(106,842)	221,914	(54,273)
Net (decrease) increase in cash and cash equivalents	(34,682)	37,203	3,203
Cash, cash equivalents and restricted cash, beginning of year	91,954	54,751	51,548
Cash, cash equivalents and restricted cash, end of year	57,272	91,954	54,751
Cash and cash equivalents	47,956	82,610	44,801
Restricted cash	$ 9,316	$ 9,344	$ 9,950

Summary of Significant Accounti

Summary of Significant Accounting Policies (Notes)	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Business and Organization American Assets Trust, Inc. (which may be referred to in these financial statements as the “company,” “we,” “us,” or “our”) is a Maryland corporation formed on July 16, 2010 that did not have any operating activity until the consummation of our initial public offering (the “Offering”) and the related acquisition on January 19, 2011 of certain assets of a combination of entities whose assets included entities owned and/or controlled by Ernest S. Rady and his affiliates, including the Rady Trust, which in turn owned (1) controlling interests in entities owning 17 properties and the property management business of American Assets, Inc. and (2) noncontrolling interests in entities owning four properties. The company is the sole general partner of American Assets Trust, L.P., a Maryland limited partnership formed on July 16, 2010 (the “Operating Partnership”). The company's operations are carried on through our Operating Partnership and its subsidiaries, including our taxable REIT subsidiary. Since the formation of our Operating Partnership, the company has controlled our Operating Partnership as its general partner and has consolidated its assets, liabilities and results of operations. We are a vertically integrated and self-administered REIT with 189 employees providing substantial in-house expertise in asset management, property management, property development, leasing, tenant improvement construction, acquisitions, repositioning, redevelopment and financing. Any reference to the number of properties or units, square footage or acres, employees; or references to beneficial ownership interests, are unaudited and outside the scope of our independent registered public accounting firm's audit of our financial statements in accordance with the standards of the United States Public Company Accounting Oversight Board. As of December 31, 2018 , we owned or had a controlling interest in 27 office, retail, multifamily and mixed-use operating properties, the operations of which we consolidate. Additionally, as of December 31, 2018 , we owned land at three of our properties that we classify as held for development and construction in progress. A summary of the properties owned by us is as follows: Retail Carmel Country Plaza Gateway Marketplace Alamo Quarry Market Carmel Mountain Plaza Del Monte Center Hassalo on Eighth - Retail South Bay Marketplace Geary Marketplace Lomas Santa Fe Plaza The Shops at Kalakaua Solana Beach Towne Centre Waikele Center Office Torrey Reserve Campus First & Main Torrey Point Lloyd District Portfolio Solana Beach Corporate Centre City Center Bellevue The Landmark at One Market One Beach Street Multifamily Loma Palisades Hassalo on Eighth - Multifamily Imperial Beach Gardens Mariner's Point Santa Fe Park RV Resort Pacific Ridge Apartments Mixed-Use Waikiki Beach Walk Retail and Embassy Suites™ Hotel Held for Development and Construction in Progress Solana Beach Corporate Centre – Land Solana Beach – Highway 101 – Land Lloyd District Portfolio – Construction in Progress Basis of Presentation Our consolidated financial statements include the accounts of the company, our Operating Partnership and our subsidiaries. The equity interests of other investors in our Operating Partnership are reflected as noncontrolling interests. All significant intercompany transactions and balances are eliminated in consolidation. Use of Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America, referred to as “GAAP,” requires management to make estimates and assumptions that in certain circumstances affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities, and revenues and expenses. These estimates are prepared using management's best judgment, after considering past, current and expected events and economic conditions. Actual results could differ from these estimates. Consolidated Statements of Cash Flows-Supplemental Disclosures The following table provides supplemental disclosures related to the Consolidated Statements of Cash Flows (in thousands): Year Ended December 31, 2018 2017 2016 Supplemental cash flow information Total interest costs incurred $ 53,736 $ 55,418 $ 53,487 Interest capitalized $ 1,488 $ 1,570 $ 1,551 Interest expense $ 52,248 $ 53,848 $ 51,936 Cash paid for interest, net of amounts capitalized $ 52,632 $ 47,473 $ 47,793 Cash paid for income taxes $ 462 $ 461 $ 641 Supplemental schedule of noncash investing and financing activities Increase (decrease) in accounts payable and accrued liabilities for construction in progress $ 8,379 $ (2,746 ) $ (435 ) Increase (decrease) in accrued leasing commissions $ 3,534 $ 726 $ (355 ) Reduction to capital for prepaid equity financing costs $ 241 $ — $ — Revenue Recognition and Accounts Receivable Our leases with tenants are classified as operating leases. Substantially all such leases contain fixed rent escalations which occur at specified times during the term of the lease. Base rents are recognized on a straight-line basis from when the tenant controls the space through the term of the related lease, net of valuation adjustments, based on management's assessment of credit, collection and other business risks. When we determine that we are the owner of tenant improvements and the tenant has reimbursed us for a portion or all of the tenant improvement costs, we consider the amount paid to be additional rent, which is recognized on a straight-line basis over the term of the related lease. For first generation tenants, in instances in which we fund tenant improvements and the improvements are deemed to be owned by us, revenue recognition will commence when the improvements are substantially completed and possession or control of the space is turned over to the tenant. When we determine that the tenant is the owner of tenant improvements, tenant allowances are recorded as lease incentives and we commence revenue recognition and lease incentive amortization when possession or control of the space is turned over to the tenant for tenant work to begin. Percentage rents, which represent additional rents based upon the level of sales achieved by certain tenants, are recognized at the end of the lease year or earlier if we have determined the required sales level is achieved and the percentage rents are collectible. Real estate tax and other cost reimbursements are recognized on an accrual basis over the periods in which the related expenditures are incurred. Other property income includes parking income, general excise tax billed to tenants and fees charged to tenants at our multifamily properties. Other property income is recognized when we satisfy performance obligations as evidenced by the transfer of control of our services to customers. We measure other property income based on the amount of consideration we expect to be entitled to in exchange for the services provided. We recognize general excise tax gross, with the amounts billed to tenants and customers recorded in other property income and the related taxes paid as rental expense. The general excise tax included in other income was $3.6 million , $3.7 million and $3.8 million for the years ended December 31, 2018 , 2017 and 2016 , respectively. For a tenant to terminate its lease agreement prior to the end of the agreed term, we may require that they pay a fee to cancel the lease agreement. Lease termination fees for which the tenant has relinquished control of the space are generally recognized on the later of the termination date or the satisfaction of all conditions precedent to the lease termination, including, without limitation, payment of all lease termination fees. When a lease is terminated early but the tenant continues to control the space under a modified lease agreement, the lease termination fee is generally recognized evenly over the remaining term of the modified lease agreement. We recognize revenue on the hotel portion of our mixed-use property from the rental of hotel rooms and guest services when we satisfy performance obligations as evidenced by the transfer of control when the rooms are occupied and services have been provided. Food and beverage sales are recognized when the customer has been served or at the time the transaction occurs. Revenue from room rental is included in rental revenue on the statement of income. Revenue from other sales and services provided is included in other property income on the statement of income. We make estimates of the collectability of our accounts receivable related to minimum rents, straight-line rents, expense reimbursements and other revenue. Accounts receivable and deferred rent receivable are carried net of this allowance for doubtful accounts. We generally do not require collateral or other security from our tenants, other than letters of credit or security deposits. Our determination as to the collectability of accounts receivable and correspondingly, the adequacy of this allowance, is based primarily upon evaluations of individual receivables, current economic conditions, historical experience and other relevant factors. The allowance for doubtful accounts is increased or decreased through bad debt expense. In some cases, primarily relating to straight-line rents, the collection of these amounts extends beyond one year. Our experience relative to unbilled straight-line rents is that a portion of the amounts otherwise recognizable as revenue is never billed to or collected from tenants due to early lease terminations, lease modifications, bankruptcies and other factors. Accordingly, the extended collection period for straight-line rents along with our evaluation of tenant credit risk may result in the nonrecognition of a portion of straight-line rental income until the collection of such income is reasonably assured. If our evaluation of tenant credit risk changes indicating more straight-line revenue is reasonably collectible than previously estimated and realized, the additional straight-line rental income is recognized as revenue. If our evaluation of tenant credit risk changes indicating a portion of realized straight-line rental income is no longer collectible, a reserve and bad debt expense is recorded. At December 31, 2018 and December 31, 2017 , our allowance for doubtful accounts was $0.6 million and $0.4 million , respectively. Our allowance for deferred rent receivables at December 31, 2018 and December 31, 2017 was $0.3 million and $1.4 million , respectively. Total bad debt expense was $0.8 million , $0.8 million and $0.8 million for the years ended December 31, 2018 , 2017 and 2016 , respectively. We recognize gains on sales of properties upon the closing of the transaction with the purchaser. Gains on properties sold are recognized when we satisfy performance obligations as evidenced when (1) the collectability of the sales price is reasonably assured, (2) we are not obligated to perform significant activities after the sale, (3) the initial investment from the buyer is sufficient and (4) other profit recognition criteria have been satisfied. Gains on sales of properties may be deferred until the requirements for gain recognition have been met. Real Estate Land, buildings and improvements are recorded at cost. Depreciation is computed using the straight-line method. Estimated useful lives range generally from 30 years to a maximum of 40 years on buildings and major improvements. Minor improvements, furniture and equipment are capitalized and depreciated over useful lives ranging from 3 years to 15 years . Maintenance and repairs that do not improve or extend the useful lives of the related assets are charged to operations as incurred. Tenant improvements are capitalized and depreciated over the life of the related lease or their estimated useful life, whichever is shorter. If a tenant vacates its space prior to the contractual termination of its lease, the undepreciated balance of any tenant improvements are written off if they are replaced or have no future value. For the years ended December 31, 2018 , 2017 and 2016 , real estate depreciation expense was $99.6 million , $70.2 million and $62.5 million , respectively. Acquisitions of properties are accounted for in accordance with the authoritative accounting guidance on acquisitions and business combinations. Our methodology of allocating the cost of acquisitions to assets acquired and liabilities assumed is based on estimated fair values, replacement cost and appraised values. When we acquire operating real estate properties, the purchase price is allocated to land and buildings, intangibles such as in-place leases, and to current assets and liabilities acquired, if any. Such valuations include a consideration of the noncancelable terms of the respective leases as well as any applicable renewal periods. The fair values associated with below market renewal options are determined based on a review of several qualitative and quantitative factors on a lease-by-lease basis at acquisition to determine whether it is probable that the tenant would exercise its option to renew the lease agreement. These factors include: (1) the type of tenant in relation to the property it occupies, (2) the quality of the tenant, including the tenant's long term business prospects and (3) whether the fixed rate renewal option was sufficiently lower than the fair rental of the property at the date the option becomes exercisable such that it would appear to be reasonably assured that the tenant would exercise the option to renew. The value allocated to in-place leases is amortized over the related lease term and reflected as depreciation and amortization in the statement of income. The value of above and below market leases associated with the original noncancelable lease terms are amortized to rental income over the terms of the respective noncancelable lease periods and are reflected as either an increase (for below market leases) or a decrease (for above market leases) to rental income in the statement of income. The value of the leases associated with below market lease renewal options that are likely to be exercised are amortized to rental income over the respective renewal periods. If a tenant vacates its space prior to contractual termination of its lease or the lease is not renewed, the unamortized balance of any in-place lease value is written off to rental income and amortization expense. Transaction costs related to the acquisition of a business, such as broker fees, transfer taxes, legal, accounting, valuation, and other professional and consulting fees, are expensed as incurred and included in “general and administrative expenses” in our consolidated statements of comprehensive income. For asset acquisitions not meeting the definition of a business, transaction costs are capitalized as part of the acquisition cost. Capitalized Costs We capitalize certain costs related to the development and redevelopment of real estate including pre-construction costs, real estate taxes, insurance and construction costs and salaries and related costs of personnel directly involved. Additionally, we capitalize interest costs related to development and significant redevelopment activities. Capitalization of these costs begins when the activities and related expenditures commence and cease when the project is substantially complete and ready for its intended use, at which time the project is placed in service and depreciation commences. Additionally, we make estimates as to the probability of certain development and redevelopment projects being completed. If we determine that the completion of development or redevelopment is no longer probable, we expense all capitalized costs which are not recoverable. Impairment of Long Lived Assets We review for impairment on a property by property basis whenever events or changes in circumstances indicate that the carrying value of a property may not be fully recoverable. Impairment is recognized on properties held for use when the expected undiscounted cash flows for a property are less than its carrying amount at which time the property is written-down to fair value. Properties held for sale are recorded at the lower of the carrying amount or the expected sales price less costs to sell. There were no impairment charges during the years ended December 31, 2018, 2017 and 2016. Financial Instruments The estimated fair values of financial instruments are determined using available market information and appropriate valuation methods. Considerable judgment is necessary to interpret market data and develop estimated fair values. The use of different market assumptions or estimation methods may have a material effect on the estimated fair value amounts. Accordingly, estimated fair values are not necessarily indicative of the amounts that could be realized in current market exchanges. Derivative Instruments At times, we may use derivative instruments to manage exposure to variable interest rate risk. We may enter into interest rate swaps to manage our exposure to variable interest rate risk. If and when we enter into derivative instruments, we ensure that such instruments qualify as cash flow hedges and would not enter into derivative instruments for speculative purposes. Any interest rate swaps associated with our cash flow hedges are recorded at fair value on a recurring basis. We assess effectiveness of our cash flow hedges both at inception and on an ongoing basis. The effective portion of changes in fair value of the interest rate swaps associated with our cash flow hedges is recorded in accumulated other comprehensive income (loss) and is subsequently reclassified into interest expense as interest is incurred on the related variable rate debt. Our cash flow hedges become ineffective if critical terms of the hedging instrument and the debt instrument do not perfectly match such as notional amounts, settlement dates, reset dates, calculation period and LIBOR rate. In addition, we evaluate the default risk of the counterparty by monitoring the credit worthiness of the counterparty. When ineffectiveness exists, the ineffective portion of changes in fair value of the interest rate swaps associated with our cash flow hedges is recognized in earnings in the period affected. See the discussion under Note 8 for certain quantitative details related to interest rate swaps and for a discussion on how we value derivative financial instruments. Cash and Cash Equivalents We define cash and cash equivalents as cash on hand, demand deposits with financial institutions and short term liquid investments with an initial maturity of less than 3 months . Cash balances in individual banks may exceed the federally insured limit of $250,000 by the Federal Deposit Insurance Corporation (the "FDIC"). No losses have been experienced related to such accounts. At December 31, 2018 and December 31, 2017 , we had $42.4 million and $45.7 million , respectively, in excess of the FDIC insured limit. At December 31, 2018 and December 31, 2017 , we had $0.2 million and $29.4 million , respectively, in money market funds that are not FDIC insured. Restricted Cash Restricted cash consists of amounts held by lenders to provide for future real estate tax expenditures, insurance expenditures and reserves for capital improvements. At December 31, 2018 and 2017 , we had $9.3 million and $9.3 million , respectively, in restricted cash. Other Assets Other assets consist primarily of lease costs, lease incentives, acquired in-place leases and acquired above market leases. Capitalized lease costs are direct costs incurred which were essential to originate a lease and would not have been incurred had the leasing transaction not taken place and include third party commissions related to obtaining a lease. Capitalized lease costs are amortized over the life of the related lease and included in depreciation and amortization expense on the statement of income. If a tenant vacates its space prior to the contractual termination of its lease, the unamortized balance of any lease costs are written off. We view these lease costs as part of the up-front initial investment we made in order to generate a long-term cash inflow. Therefore, we classify cash outflows for lease costs as an investing activity in our consolidated statements of cash flows. Variable Interest Entities Certain entities that do not have sufficient equity at risk for the entity to finance its activities without additional subordinated financial support from other parties or in which equity investors do not have the characteristics of a controlling financial interest qualify as variable interest entities (“VIEs”). VIEs are required to be consolidated by their primary beneficiary. The primary beneficiary of a VIE is the party that has a controlling interest in the VIE. Identifying the party with the controlling interest requires a focus on which entity has the power to direct the activities of the VIE that most significantly impact the VIE's economic performance and (1) the obligation to absorb the expected losses of the VIE or (2) the right to receive the benefits from the VIE. At December 31, 2018 and December 31, 2017 we had no investments in real estate joint ventures, and accordingly we had no VIEs which needed to be consolidated. Stock-Based Compensation We grant stock-based compensation awards to our employees and directors typically in the form of restricted shares of common stock, options to purchase common stock and/or shares of common stock. We measure stock-based compensation expense based on the fair value of the award on the grant date and recognize the expense ratably over the vesting period. Modifications of stock-based compensation awards are treated as an exchange of the original award for a new award with the resulting total compensation cost equal to the grant-date fair value of the original award plus the incremental value of the modification to the award. The calculation of the incremental value is based on the excess of the fair value of the new (modified) award based on current circumstances over the fair value of the original option measured immediately before its terms are modified. For the year ended December 31, 2017, we incurred incremental compensation cost of approximately $2.2 million related to the discretionary vesting of previously granted restricted stock awards that did not meet the original vesting criteria. For the years ended December 31, 2018 and 2016, there were no modifications of stock-based compensation awards. Deferred Compensation Our Operating Partnership has adopted the American Assets Trust Executive Deferral Plan V (“EDP V”) and the American Assets Trust Executive Deferral Plan VI (“EDP VI”). These plans were adopted by our Operating Partnership as successor plans to those deferred compensation plans maintained by American Assets Inc. ("AAI") in which certain employees of AAI, who were transferred to us in connection with the Offering (the “Transferred Participants”), participated prior to the Offering. EDP V and EDP VI contain substantially the same terms and conditions as these predecessor plans. AAI transferred to our Operating Partnership the Transferred Participants' account balances under the predecessor plans. These transferred account balances represent amounts deferred by the Transferred Participants prior to the Offering while they were employed by AAI. At the time eligible participants defer compensation, we record compensation cost and a corresponding deferred compensation plan liability, which is included in other liabilities and deferred credits on our consolidated balance sheets. This liability is adjusted to fair value at the end of each accounting period based on the performance of the benchmark funds selected by each participant, and the impact of adjusting the liability to fair value is recorded as an increase or decrease to compensation cost. Income Taxes We elected to be taxed as a REIT under the Internal Revenue Code of 1986, as amended (the “Code”) commencing with the taxable year ending December 31, 2011. To maintain our qualification as a REIT, we are required to distribute at least 90% of our REIT taxable income to our stockholders and meet the various other requirements imposed by the Code relating to such matters as operating results, asset holdings, distribution levels and diversity of stock ownership. Provided we maintain our qualification for taxation as a REIT, we are generally not subject to corporate level income tax on the earnings distributed currently to our stockholders that we derive from our REIT qualifying activities. If we fail to maintain our qualification as a REIT in any taxable year, and are unable to avail ourselves of certain savings provisions set forth in the Code, all of our taxable income would be subject to regular U.S. federal income tax. We are subject to certain state and local income taxes. We, together with one of our subsidiaries, have elected to treat such subsidiary as a taxable REIT subsidiary (a “TRS”) for federal income tax purposes. Certain activities that we undertake must be conducted by a TRS, such as non-customary services for our tenants, and holding assets that we cannot hold directly. A TRS is subject to federal and state income taxes. Segment Information Segment information is prepared on the same basis that our management reviews information for operational decision-making purposes. We operate in four reportable segments: the acquisition, redevelopment, ownership and management of retail real estate, office real estate, multifamily real estate and mixed-use real estate. The products for our retail segment primarily include rental of retail space and other tenant services, including tenant reimbursements, parking and storage space rental. The products for our office segment primarily include rental of office space and other tenant services, including tenant reimbursements, parking and storage space rental. The products for our multifamily segment include rental of apartments and other tenant services. The products of our mixed-use segment include rental of retail space and other tenant services, including tenant reimbursements, parking and storage space rental and operation of a 369 -room all-suite hotel. Recent Accounting Pronouncements In August 2017, the FASB issued Accounting Standards Update (“ASU”) 2017-12, Derivatives and Hedging: Targeted Improvements to Accounting for Hedging Activities . The pronouncement was issued to simplify the on-going assessment of hedge effectiveness and increase transparency related to hedge accounting. The pronouncement is effective for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2018, with early adoption permitted. The company early adopted the provisions of ASU No. 2017-12 effective October 1, 2017 using the modified retrospective approach. The company determined there is no impact to the company’s historical results as a result of adoption of the new standard and therefore no adjustment to retained earnings from application of the ASU. In January 2017, the FASB issued ASU 2017-1, Business Combinations: Clarifying the Definition of a Business . The pronouncement changes the definition of a business to assist entities with evaluating when a set of transferred assets and activities is a business. The pronouncement requires an entity to evaluate if substantially all of the fair value of the gross assets acquired is concentrated in a single identifiable asset or a group of similar identifiable assets; if so, the set of transferred assets and activities is not a business. The pronouncement is effective for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2018, with early adoption permitted. The company early adopted this ASU effective January 1, 2017. For the period from January 1, 2017 through December 31, 2017, the company acquired three properties for which we concluded that substantially all of the fair value of the assets acquired were concentrated in a single identifiable asset and that the assets therefore did not meet the definition of a business under ASU 2017-01. Acquisition transaction costs associated with these property acquisitions were approximately $0.2 million and were capitalized to real estate investments. In November 2016, the FASB issued ASU 2016-18, Restricted Cash . This pronouncement requires companies to include restricted cash and restricted cash equivalents with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. The pronouncement also requires a disclosure of a reconciliation between the statement of financial position and the statement of cash flows when the balance sheet includes more than one line item for cash, cash equivalents, restricted cash, and restricted cash equivalents. Entities with material restricted cash and restricted cash equivalents balances will be required to disclose the nature of the restrictions. The ASU is effective for reporting periods beginning after December 15, 2017, with early adoption permitted, and will be applied retrospectively to all periods presented. The company adopted this ASU effective December 31, 2017. The adoption of this ASU impacted the presentation of cash flows with inclusion of restricted cash flows for each of the presented periods. As of December 31, 2018 and 2017, we had $9.3 million and $9.3 million of restricted cash, respectively, on our consolidated balance sheets. In March 2016, the FASB issued ASU 2016-09, Improvements to Employee Share-Based Payment Accounting , which simplifies several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. ASU 2016-09 is effective for fiscal years beginning after December 15, 2016, and interim periods within those fiscal years. The company adopted this ASU effective January 1, 2017 and the adoption did not have a material impact on our consolidated financial statements. In February 2016, the FASB issued ASU No. 2016-2, Leases (Topic 842), which provides the principles for the recognition, measurement, presentation and disclosure of leases. This ASU significantly changes the accounting for leases by requiring lessees to recognize assets and liabilities for leases greater than 12 months on their balance sheet. The lessor model stays substantially the same; however, there were modifications to conform lessor accounting with the lessee model, eliminate real estate specific guidance, further define certain lease and non-lease components, and change the definition of initial direct costs of leases requiring significantly more leasing related costs to be expensed upfront. The pronouncement is effective for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2018. We will adopt ASU No. 2016-2 in the first quarter of 2019 using the modified retrospective approach. In July 2018, the FASB issued ASU 2018-11, Leases (Topic 842): Targeted Improvements , which allows lessors to elect a practical expedient by class of underlying assets to not separate non-lease components from the lease component if certain conditions are met. The lessor’s practical expedient election would be limited to circumstances in which the non-lease components otherwise would be accounted for under the new revenue guidance and both (i) the timing and pattern of transfer are the same for the nonlease component and the related lease component and (ii) the lease component would be classified as an operating lease. The company will elect the practical expedient which would allow the company the ability to combine the lease and non-lease components if the underlying asset meets the criteria above. ASU 2018-11 also includes an optional transition method in addition to the existing requirements for transition to the new standard by recognizing a cumulative effect adjustment to the opening balance sheet of retained earnings in the period of adoption. Consequently, a company’s reporting for the comparative periods presented in the financial statements would continue to be in accordance with current GAAP (Topic 840). The company will elect this practical expedient as well. While we continue to evaluate the impact this pronouncement will have on our consolidated financial statements, we expe

Real Estate (Notes)

Real Estate (Notes)	12 Months Ended
	Dec. 31, 2018
Real Estate [Line Items]
REAL ESTATE	REAL ESTATE A summary of our real estate investments is as follows (in thousands): Retail Office Multifamily Mixed-Use Total December 31, 2018 Land $ 262,860 $ 143,467 $ 72,668 $ 76,635 $ 555,630 Buildings 516,566 743,474 389,831 125,859 1,775,730 Land improvements 43,412 8,825 6,778 2,606 61,621 Tenant improvements 70,210 91,612 — 1,918 163,740 Furniture, fixtures, and equipment 570 2,671 13,844 6,826 23,911 Construction in progress 8,598 39,511 854 596 49,559 (1) 902,216 1,029,560 483,975 214,440 2,630,191 Accumulated depreciation (273,482 ) (206,986 ) (71,933 ) (37,937 ) (590,338 ) Net real estate $ 628,734 $ 822,574 $ 412,042 $ 176,503 $ 2,039,853 December 31, 2017 Land $ 262,860 $ 143,575 $ 72,668 $ 76,635 $ 555,738 Buildings 548,062 705,999 383,210 125,859 1,763,130 Land improvements 42,401 9,313 6,758 2,606 61,078 Tenant improvements 67,879 80,968 — 1,955 150,802 Furniture, fixtures, and equipment 372 2,085 12,377 6,429 21,263 Construction in progress 3,086 52,512 6,505 24 62,127 (1) 924,660 994,452 481,518 213,508 2,614,138 Accumulated depreciation (266,006 ) (181,331 ) (57,474 ) (32,620 ) (537,431 ) Net real estate $ 658,654 $ 813,121 $ 424,044 $ 180,888 $ 2,076,707 (1) Land related to held for development and construction in progress is included in the Held for Development and Construction in Progress classifications on the consolidated balance sheets. Property Asset Acquisitions On April 28, 2017, we acquired the Pacific Ridge Apartments, a 533 -unit luxury apartment community located in San Diego, California. The purchase price was approximately $232 million , excluding closing costs of approximately $0.1 million . On July 6, 2017, we acquired Gateway Marketplace, an approximately 128,000 square feet dual-grocery anchored shopping center located in Chula Vista, California. The purchase price was approximately $42 million , excluding closing costs of approximately $0.1 million . The properties were acquired with cash on hand and borrowings under our Amended and Restated Credit Agreement (as defined herein). The financial information set forth below summarizes the company’s purchase price allocations for the Pacific Ridge Apartments and Gateway Marketplace during the year ended December 31, 2017 (in thousands): Pacific Ridge Apartments Gateway Marketplace Land $ 47,971 $ 17,363 Building 171,813 19,192 Land improvements 3,403 1,522 Furniture, fixtures, and equipment 3,281 930 Total real estate 226,468 39,007 Lease intangibles 5,592 2,920 Prepaid expenses and other assets 424 — Assets acquired $ 232,484 $ 41,927 Accounts payable and accrued expenses $ 74 $ 203 Security deposits payable 673 22 Other liabilities and deferred credits 49 1,034 Liabilities assumed $ 796 $ 1,259 The following table summarizes the operating results for the Pacific Ridge Apartments and Gateway Marketplace included in the company’s historical consolidated statement of operations for the period of acquisition through December 31, 2017 (in thousands): Pacific Ridge Apartments Gateway Marketplace Total Revenues $ 10,983 $ 1,667 $ 12,650 Operating expenses $ 15,238 $ 1,082 $ 16,320 Operating (loss) income $ (4,255 ) $ 585 $ (3,670 ) Net (loss) income attributable to American Assets Trust, Inc. $ (4,255 ) $ 585 $ (3,670 ) Pro Forma Financial Information The unaudited financial information in the table below summarizes the combined results of operations of the Pacific Ridge Apartments and Gateway Marketplace with the company’s historical consolidated statements of operations as though the entities were acquired on January 1, 2016. The pro forma financial information includes adjustments to depreciation expense for acquired property and equipment and adjustments to amortization charges for acquired intangible assets and liabilities. The pro forma financial information set forth below is presented for informational purposes only and may not be indicative of what actual results of operations would have been had the transactions occurred at the beginning of 2016, nor does it purport to represent the results of future operations (in thousands). Year Ended December 31, 2017 Year Ended December 31, 2016 As Reported ProForma As Reported ProForma Total revenue $ 314,983 $ 322,050 $ 295,088 $ 312,414 Total operating expenses $ 221,337 $ 230,796 $ 197,147 $ 215,631 Operating income $ 93,646 $ 91,255 $ 97,941 $ 96,783 Net income $ 40,132 $ 36,433 $ 45,637 $ 41,916 Dispositions None.

Acquired In-Place Leases and Ab

Acquired In-Place Leases and Above/Below Market Leases (Notes)	12 Months Ended
	Dec. 31, 2018
Leases [Abstract]
ACQUIRED IN-PLACE LEASES AND ABOVE/BELOW MARKET LEASES	ACQUIRED IN-PLACE LEASES AND ABOVE/BELOW MARKET LEASES The following summarizes our acquired lease intangibles, which are included in other assets and other liabilities and deferred credits (in thousands): December 31, 2018 December 31, 2017 In-place leases $ 40,884 $ 54,206 Accumulated amortization (34,603 ) (45,835 ) Above market leases 11,963 21,262 Accumulated amortization (11,445 ) (20,084 ) Acquired lease intangible assets, net $ 6,799 $ 9,549 Below market leases $ 63,172 $ 67,423 Accumulated accretion (37,220 ) (37,241 ) Acquired lease intangible liabilities, net $ 25,952 $ 30,182 The value allocated to in-place leases is amortized over the related lease term as depreciation and amortization expense in the statement of income. Above and below market leases are amortized over the related lease term as additional rental income for below market leases or a reduction of rental income for above market leases in the statement of income. Rental income (loss) includes net amortization from acquired above and below market leases of $3.6 million , $3.3 million and $3.5 million in 2018 , 2017 and 2016 , respectively. The remaining weighted-average amortization period as of December 31, 2018 , is 7.8 years, 1.2 years and 5.9 years for in-place leases, above market leases and below market leases, respectively. Below market leases include $14.6 million related to below market renewal options, and the weighted-average period prior to the commencement of the renewal options is 8.5 years. Increases (decreases) in net income as a result of amortization of our in-place leases, above market leases and below market leases are as follows (in thousands): Year Ended December 31, 2018 2017 2016 Amortization of in-place leases $ (2,090 ) $ (8,769 ) $ (4,029 ) Amortization of above market leases (660 ) (934 ) (1,248 ) Amortization of below market leases 4,230 4,239 4,719 Net income (loss) $ 1,480 $ (5,464 ) $ (558 ) As of December 31, 2018 , the amortization for acquired leases during the next five years and thereafter, assuming no early lease terminations, is as follows (in thousands): In-Place Leases Above Market Leases Below Market Leases Year Ending December 31, 2019 $ 1,620 $ 339 $ 3,478 2020 1,053 58 2,647 2021 719 28 2,414 2022 632 28 2,242 2023 539 27 2,073 Thereafter 1,718 38 13,098 $ 6,281 $ 518 $ 25,952

Fair Value of Financial Instrum

Fair Value of Financial Instruments (Notes)	12 Months Ended
	Dec. 31, 2018
Fair Value Disclosures [Abstract]
FAIR VALUE OF FINANCIAL INSTRUMENTS	FAIR VALUE OF FINANCIAL INSTRUMENTS A fair value measurement is based on the assumptions that market participants would use in pricing an asset or liability. The hierarchy for inputs used in measuring fair value is as follows: 1. Level 1 Inputs—quoted prices in active markets for identical assets or liabilities 2. Level 2 Inputs—observable inputs other than quoted prices in active markets for identical assets and liabilities 3. Level 3 Inputs—unobservable inputs In certain cases, the inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, for disclosure purposes, the level within which the fair value measurement is categorized is based on the lowest level input that is significant to the fair value measurement. Except as disclosed below, the carrying amount of our financial instruments approximates their fair value. Financial assets and liabilities whose fair values we measure on a recurring basis using Level 2 inputs consist of our deferred compensation liability and interest rate swap liability. We measure the fair values of these liabilities based on prices provided by independent market participants that are based on observable inputs using market-based valuation techniques provided by third parties using proprietary valuation models and analytical tools as of December 31, 2018 and 2017 . These valuation models and analytical tools use market pricing or similar instruments that are both objective and publicly available, including matrix pricing or reported trades, benchmark yields, broker/dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids and/or offers. A summary of our financial liabilities that are measured at fair value on a recurring basis by level within the fair value hierarchy is as follows (in thousands): December 31, 2018 December 31, 2017 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Deferred compensation liability $ — $ 1,424 $ — $ 1,424 $ — $ 1,156 $ — $ 1,156 Interest rate swap asset $ — $ 6,002 $ — $ 6,002 $ — $ 5,091 $ — $ 5,091 Interest rate swap liability $ — $ 801 $ — $ 801 $ — $ 10 $ — $ 10 The fair value of our secured notes payable and unsecured notes payable is sensitive to fluctuations in interest rates. Discounted cash flow analysis (Level 2) is generally used to estimate the fair value of our mortgages and notes payable, using rates ranging from 4.3% to 4.8% . Considerable judgment is necessary to estimate the fair value of financial instruments. The estimates of fair value presented herein are not necessarily indicative of the amounts that could be realized upon disposition of the financial instruments. The carrying values of our line of credit and term loan set forth below are deemed to be at fair value since the outstanding debt is directly tied to monthly LIBOR contracts. A summary of the carrying amount and fair value of our financial instruments, all of which are based on Level 2 inputs, is as follows (in thousands): December 31, 2018 December 31, 2017 Carrying Value Fair Value Carrying Value Fair Value Secured notes payable $ 182,572 $ 183,253 $ 279,550 $ 286,156 Unsecured term loan $ 248,765 $ 250,000 $ 248,839 $ 250,000 Unsecured senior guaranteed notes $ 797,098 $ 790,267 $ 796,631 $ 802,699 Unsecured line of credit $ 62,337 $ 64,000 $ — $ —

Other Assets (Notes)

Other Assets (Notes)	12 Months Ended
	Dec. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
OTHER ASSETS	OTHER ASSETS Other assets consist of the following (in thousands): December 31, 2018 December 31, 2017 Leasing commissions, net of accumulated amortization of $28,597 and $28,318, respectively $ 28,796 $ 20,633 Interest rate swap asset 6,002 5,091 Acquired above market leases, net 518 1,178 Acquired in-place leases, net 6,281 8,371 Lease incentives, net of accumulated amortization of $299 and $136, respectively 747 916 Other intangible assets, net of accumulated amortization of $981 and $1,115, respectively 2,994 227 Prepaid expenses, deposits and other 6,683 5,945 Total other assets $ 52,021 $ 42,361 Lease incentives are amortized over the term of the related lease and included as a reduction of rental income in the statement of income.

Other Liabilities and Deferred

Other Liabilities and Deferred Credits (Notes)	12 Months Ended
	Dec. 31, 2018
Other Liabilities Disclosure [Abstract]
OTHER LIABILITIES AND DEFERRED CREDITS	OTHER LIABILITIES AND DEFERRED CREDITS Other liabilities and deferred credits consist of the following (in thousands): December 31, 2018 December 31, 2017 Acquired below market leases, net $ 25,952 $ 30,182 Prepaid rent and deferred revenue 11,634 8,429 Interest rate swap liability 801 10 Straight-line rent liability 7,393 4,428 Deferred rent expense and lease intangible 2,210 1,670 Deferred compensation 1,424 1,156 Deferred tax liability 93 123 Other liabilities 40 63 Total other liabilities and deferred credits, net $ 49,547 $ 46,061 Straight-line rent liability relates to leases which have rental payments that decrease over time or one-time upfront payments for which the rental revenue is deferred and recognized on a straight-line basis.

Debt (Notes)

Debt (Notes)	12 Months Ended
	Dec. 31, 2017
Debt Disclosure [Abstract]
DEBT	DEBT Debt of American Assets Trust, Inc. American Assets Trust, Inc. does not hold any indebtedness. All debt is held directly or indirectly by the Operating Partnership; however, American Assets Trust, Inc. has guaranteed the Operating Partnership's second amended and restated credit facility, term loan and carve-out guarantees on property-level debt. Debt of American Assets Trust, L.P. Secured notes payable The following is a summary of the Operating Partnership's total secured notes payable outstanding as of December 31, 2018 and December 31, 2017 (in thousands): Description of Debt Principal Balance as of Stated Interest Rate Stated Maturity Date December 31, 2018 December 31, 2017 as of December 31, 2018 Loma Palisades (1)(2) — 73,744 6.09 % July 1, 2018 One Beach Street (1)(3) — 21,900 3.94 % April 1, 2019 Torrey Reserve—North Court (4) 19,620 20,023 7.22 % June 1, 2019 Torrey Reserve—VCI, VCII, VCIII (4) 6,635 6,764 6.36 % June 1, 2020 Solana Beach Corporate Centre I-II (4) 10,502 10,721 5.91 % June 1, 2020 Solana Beach Towne Centre (4) 35,008 35,737 5.91 % June 1, 2020 City Center Bellevue (1) 111,000 111,000 3.98 % November 1, 2022 182,765 279,889 Debt issuance costs, net of accumulated amortization of $671 and $1,191, respectively (193 ) (339 ) Total Secured Notes Payable $ 182,572 $ 279,550 (1) Interest only. (2) Loan repaid in full, without premium or penalty, on March 30, 2018. (3) Loan repaid in full, without premium or penalty, on November 30, 2018. (4) Principal payments based on a 30 -year amortization schedule. Certain loans require us to comply with various financial covenants, including the maintenance of minimum debt coverage ratios. As of December 31, 2018 , we were in compliance with all loan covenants. Unsecured notes payable The following is a summary of the Operating Partnership's total unsecured notes payable outstanding as of December 31, 2018 and December 31, 2017 (in thousands): Description of Debt Principal Balance as of Stated Interest Rate Stated Maturity Date December 31, 2018 December 31, 2017 as of December 31, 2018 Term Loan A $ 100,000 $ 100,000 Variable (1) January 9, 2019 (2) Senior Guaranteed Notes, Series A 150,000 150,000 4.04 % (3) October 31, 2021 Term Loan B 100,000 100,000 Variable (4) March 1, 2023 Term Loan C 50,000 50,000 Variable (5) March 1, 2023 Senior Guaranteed Notes, Series F 100,000 100,000 3.78 % (6) July 19, 2024 Senior Guaranteed Notes, Series B 100,000 100,000 4.45 % February 2, 2025 Senior Guaranteed Notes, Series C 100,000 100,000 4.50 % April 1, 2025 Senior Guaranteed Notes, Series D 250,000 250,000 4.29 % (7) March 1, 2027 Senior Guaranteed Notes, Series E 100,000 100,000 4.24 % (8) May 23, 2029 1,050,000 1,050,000 Debt issuance costs, net of accumulated amortization of $6,844 and $5,866, respectively (4,137 ) (4,530 ) Total Unsecured Notes Payable $ 1,045,863 $ 1,045,470 (1) The company has entered into an interest rate swap agreement that is intended to fix the interest rate associated with the Term Loan at approximately 3.08% through its maturity date and extension options, subject to adjustments based on the Operating Partnership's consolidated leverage ratio. (2) The Operating Partnership's Term Loan A had a maturity date of January 9, 2019 with no options to extend Term Loan A. However, on January 9, 2019, we extended Term Loan A to a maturity date of January 9, 2021 with an option to extend Term Loan A up to three times, with each such extension for a 12-month period. The foregoing extension options are exercisable by the Operating Partnership subject to the satisfaction of certain conditions. (3) The company entered into a one -month forward-starting seven -year swap contract on August 19, 2014, which was settled on September 19, 2014 at a gain of approximately $1.6 million (see Note 8 ). The forward-starting seven-year swap contract was deemed to be a highly effective cash flow hedge, accordingly, the effective interest rate is approximately 3.88% per annum. (4) The Operating Partnership has entered into an interest rate swap agreement that is intended to fix the interest rate associated with Term Loan B at approximately 3.15% through its maturity date, subject to adjustments based on our consolidated leverage ratio. (5) The Operating Partnership has entered into an interest rate swap agreement that is intended to fix the interest rate associated with Term Loan C at approximately 3.14% through its maturity date, subject to adjustments based on our consolidated leverage ratio. (6) The Operating Partnership entered into a treasury lock contract on May 31, 2017, which was settled on June 23, 2017 at a loss of approximately $0.5 million . The treasury lock contract was deemed to be a highly effective cash flow hedge, accordingly, the effective interest rate is approximately 3.85% per annum. (7) The Operating Partnership entered into forward-starting interest rate swap contracts on March 29, 2016 and April 7, 2016, which were settled on January 18, 2017 at a gain of approximately $10.4 million . The forward-starting interest swap rate contracts were deemed to be highly effective cash flow hedges, accordingly, the effective interest rate is approximately 3.87% per annum. (8) The Operating Partnership entered into a treasury lock contract on April 25, 2017, which was settled on May 11, 2017 at a gain of approximately $0.7 million . The treasury lock contract was deemed to be a highly effective cash flow hedge, accordingly, the effective interest rate is approximately 4.18% per annum. On March 1, 2016, the Operating Partnership entered into a Term Loan Agreement with each lender from time to time party thereto, and U.S. Bank National Association, as Administrative Agent (as amended, the “Term Loan Agreement”). The Term Loan Agreement provides for a new, seven -year unsecured term loan to the Operating Partnership of $100 million that matures on March 1, 2023 (“Term Loan B”). Concurrent with the closing of the Term Loan Agreement, the Operating Partnership drew down the entirety of Term Loan B. On May 2, 2016, the Operating Partnership entered into a Joinder and First Amendment to the Term Loan Agreement to provide for a new lender to fund an incremental term loan. The Joinder and First Amendment provides for a new, seven -year unsecured term loan to the Operating Partnership of $50 million that matures on March 1, 2023 ("Term Loan C"). Term Loan C has the same borrowing terms as the Term Loan Agreement noted below. Concurrent with the closing of the Joinder and First Amendment, the Operating Partnership drew down the entirety of Term Loan C. Borrowings under the Term Loan Agreement with respect to Term Loan B and Term Loan C bear interest at floating rates equal to, at our option, either (1) LIBOR , plus a spread which ranges from 1.70% to 2.35% based on our consolidated leverage ratio, or (2) a base rate equal to the highest of (a) 0% , (b) the prime rate , (c) the federal funds rate plus 50 bps or (d) the Eurodollar rate plus 100 bps, in each case plus a spread which ranges from 0.70% to 1.35% based on our consolidated leverage ratio. The company entered into interest rate swap agreements intended to fix the interest rates associated with Term Loan B and Term Loan C at approximately 3.15% and 3.14% , respectively, through the maturity dates, subject to adjustments based on our consolidated leverage ratio. The Term Loan Agreement contains a number of customary financial covenants, including, without limitation, tangible net worth thresholds, secured and unsecured leverage ratios and fixed charge coverage ratios. Subject to the terms of the Term Loan Agreement, upon certain events of default, including, but not limited to, (i) a default in the payment of any principal or interest under Term Loan B or Term Loan C, and (ii) a default in the payment of certain other indebtedness of the Operating Partnership, the company or their subsidiaries, the principal and accrued and unpaid interest and prepayment penalties on the outstanding Term Loan B or Term Loan C will become due and payable at the option of the lenders. On January 9, 2018, we entered into the Third Amendment (“Third Amendment”) to the Term Loan Agreement, which maintains the seven -year $150 million unsecured term loan (Term Loan B and Term Loan C) to the Operating Partnership that matures on March 1, 2023 (the “$150mm Term Loan”). Effective as of March 1, 2018, borrowings under the Term Loan Agreement with respect to the $150mm Term Loan bear interest at floating rates equal to, at the Operating Partnership’s option, either (1) LIBOR , plus a spread which ranges from 1.20% to 1.70% based on the Operating Partnership’s consolidated leverage ratio, or (2) a base rate equal to the highest of (a) 0% , (b) the prime rate , (c) the federal funds rate plus 50 bps or (d) the Eurodollar rate plus 100 bps, in each case plus a spread which ranges from 0.70% to 1.35% based on the Operating Partnership’s consolidated leverage ratio. The foregoing rates are intended to be more favorable than previously contained in the Term Loan Agreement. Additionally, the Operating Partnership may elect for borrowings to bear interest based on a ratings-based pricing grid as per the Operating Partnership’s then-applicable investment grade debt ratings under the terms set forth in the Term Loan Agreement. On October 31, 2014, the Operating Partnership entered into a note purchase agreement (the "Note Purchase Agreement") with a group of institutional purchasers that provided for the private placement of an aggregate of $350 million of senior guaranteed notes, of which (i) $150 million are designated as 4.04% Senior Guaranteed Notes, Series A, due October 31, 2021 (the “Series A Notes”), (ii) $100 million are designated as 4.45% Senior Guaranteed Notes, Series B, due February 2, 2025 (the “Series B Notes”) and (iii) $100 million are designated as 4.50% Senior Guaranteed Notes, Series C, due April 1, 2025 (the “Series C Notes”). The Series A Notes were issued on October 31, 2014, the Series B Notes were issued on February 2, 2015 and the Series C Notes were issued on April 2, 2015. The Series A Notes, the Series B Notes and the Series C Notes will pay interest quarterly on the last day of January, April, July and October until their respective maturities. On March 1, 2017, the Operating Partnership entered into a Note Purchase Agreement for the private placement of $250 million of 4.29% Senior Guaranteed Notes, Series D, due March 1, 2027 (the "Series D Notes"). The Series D Notes were issued on March 1, 2017 and will pay interest quarterly on the last day of January, April, July and October until their respective maturities. On May 23, 2017, the Operating Partnership entered into a Note Purchase Agreement for the private placement of $100 million of 4.24% Senior Guaranteed Notes, Series E, due May 23, 2029 (the "Series E Notes"). The Series E Notes were issued on May 23, 2017 and will pay interest semi-annually on the 23rd of May and November until their respective maturities. On July 19, 2017, the Operating Partnership entered into a Note Purchase Agreement for the private placement of $100 million of 3.78% Senior Guaranteed Notes, Series F, due July 19, 2024 (the "Series F Notes," and collectively with the Series A Notes, Series B Notes, Series C Notes, Series D Notes and Series E Notes are referred to herein as, the “Notes".). The Series F Notes were issued on July 19, 2017 and will pay interest semi-annually on the 31st of January and July until their respective maturities. The Operating Partnership may prepay at any time all, or from time to time any part of, the Notes, in an amount not less than 5% of the aggregate principal amount of any series of the Notes then outstanding in the case of a partial prepayment, at 100% of the principal amount so prepaid plus a Make-Whole Amount (as defined in the Note Purchase Agreement). The Note Purchase Agreement contains a number of customary financial covenants, including, without limitation, tangible net worth thresholds, secured and unsecured leverage ratios and fixed charge coverage ratios. Subject to the terms of the Note Purchase Agreement and the Notes, upon certain events of default, including, but not limited to, (i) a default in the payment of any principal, Make-Whole Amount or interest under the Notes, and (ii) a default in the payment of certain other indebtedness by us or our subsidiaries, the principal, accrued and unpaid interest, and the Make-Whole Amount on the outstanding Notes will become due and payable at the option of the purchasers. The Operating Partnership's obligations under the Notes are fully and unconditionally guaranteed by the Operating Partnership and certain of the Operating Partnership's subsidiaries. Certain loans require the Operating Partnership to comply with various financial covenants, including the maintenance of minimum debt coverage ratios. As of December 31, 2018 , the Operating Partnership was in compliance with all loan covenants. Scheduled principal payments on secured and unsecured notes payable as of December 31, 2018 are as follows (in thousands): 2019 $ 120,762 2020 51,003 2021 150,000 2022 111,000 2023 150,000 Thereafter 650,000 $ 1,232,765 Credit Facility On January 9, 2014, the company and the Operating Partnership entered into an amended and restated credit agreement (the "Prior Credit Facility"), or the amended and restated credit facility, which amended and restated the then in-place credit facility. The amended and restated credit facility provides for aggregate, unsecured borrowing of $350 million , consisting of a revolving line of credit of $250 million (the "Prior Revolver Loan") and a term loan of $100 million (the "Term Loan A"). The Prior Credit Facility had an accordion feature that allowed the Operating Partnership to increase the availability thereunder up to an additional $250 million , subject to meeting specified requirements and obtaining additional commitments from lenders. On October 16, 2014, we entered into a first amendment to the Prior Credit Agreement that amended provisions of the Prior Credit Agreement to, among other things, (1) describe the treatment of our pari passu obligations under the amended and restated credit agreement and (2) remove the material acquisition provisions previously set forth in the Prior Credit Agreement. Borrowings under the Prior Credit Facility initially bore interest at floating rates equal to, at our option, either (1) LIBOR , plus a spread which ranges from (a) 1.35% - 1.95% (with respect to the Prior Revolver Loan) and (b) 1.30% to 1.90% (with respect to Term Loan A), in each case based on our consolidated leverage ratio, or (2) a base rate equal to the highest of (a) the prime rate , (b) the federal funds rate plus 50 bps or (c) the Eurodollar rate plus 100 bps, plus a spread which ranges from (i) 0.35% - 0.95% (with respect to the Prior Revolver Loan) and (ii) 0.30% to 0.90% (with respect to Term Loan A), in each case based on our consolidated leverage ratio. The foregoing rates were more favorable than previously contained in the credit agreement in place as of December 31, 2013. If American Assets Trust, Inc. obtained an investment grade debt rating, under the terms set forth in the Prior Credit Facility, the spreads would further improve. The Prior Revolver Loan initially matured on January 9, 2018, subject to the Operating Partnership's option to extend the Prior Revolver Loan up to two times, with each such extension for a six -month period. The Term Loan initially matured on January 9, 2016, subject to our option to extend the Term Loan A up to three times, with each such extension for a 12 -month period. The foregoing extension options are exercisable by us subject to the satisfaction of certain conditions. Effective as of January 8, 2018, the Operating Partnership exercised the third of three options to extend the maturity date of Term Loan A to January 9, 2019. Concurrent with the closing of the Prior Credit Facility, the Operating Partnership drew down on the entirety of the $100 million Term Loan, which remains outstanding and is included in unsecured notes payable as discussed above. Additionally, the Prior Credit Facility included a number of financial covenants, including: • A maximum leverage ratio (defined as total indebtedness net of certain cash and cash equivalents to total asset value) of 60% , • A maximum secured leverage ratio (defined as total secured debt to secured total asset value) of 40% , • A minimum fixed charge coverage ratio (defined as consolidated earnings before interest, taxes, depreciation and amortization to consolidated fixed charges) of 1.50x, • A minimum unsecured interest coverage ratio of 1.75x, • A maximum unsecured leverage ratio of 60% , • A minimum tangible net worth of $721.16 million , and 75% of the net proceeds of any additional equity issuances (other than additional equity issuances in connection with any dividend reinvestment program), and • Recourse indebtedness at any time cannot exceed 15% of total asset value. The Prior Credit Facility provided that American Assets Trust, Inc.'s annual distributions may not exceed the greater of (1) 95% of our funds from operations (“FFO”) or (2) the amount required for us to (a) qualify and maintain our REIT status and (b) avoid the payment of federal or state income or excise tax. If certain events of default exist or would result from a distribution, we may be precluded from making distributions other than those necessary to qualify and maintain our status as a REIT. American Assets Trust, Inc. and certain of its subsidiaries guaranteed the obligations under the Prior Credit Agreement, and certain of its subsidiaries pledged specified equity interests in our subsidiaries as collateral for our obligations under the Prior Credit Facility. On January 9, 2018, we entered into a second amended and restated credit agreement (the "Second Amended and Restated Credit Facility"), which amended and restated the Prior Credit Agreement. The Second Amended and Restated Credit Facility provides for aggregate, unsecured borrowing of $450 million , consisting of a revolving line of credit of $350 million (the "Revolver Loan") and a term loan of $100 million (the "Term Loan A"). The Second Amended and Restated Credit Facility has an accordion feature that may allow us to increase the availability thereunder up to an additional $350 million , subject to meeting specified requirements and obtaining additional commitments from lenders. At December 31, 2018 , there was $64.0 million outstanding balance under the Revolver Loan. Borrowings under the Second Amended and Restated Credit Facility initially bear interest at floating rates equal to, at our option, either (1) LIBOR , plus a spread which ranges from (a) 1.05% to 1.50% (with respect to the Revolver Loan) and (b) 1.30% to 1.90% (with respect to Term Loan A), in each case based on our consolidated leverage ratio, or (2) a base rate equal to the highest of (a) the prime rate , (b) the federal funds rate plus 50 bps or (c) LIBOR plus 100 bps, plus a spread which ranges from (i) 0.10% to 0.50% (with respect to the Revolver Loan) and (ii) 0.30% to 0.90% (with respect to Term Loan A), in each case based on our consolidated leverage ratio. The foregoing rates are more favorable than previously contained in the Prior Credit Facility in place as of December 31, 2017. For the year-ended December 31, 2018 , the weighted average interest rate on the Revolver Loan was 3.20% . The Revolver Loan initially matures on January 9, 2022, subject to our option to extend the Revolver Loan up to two times, with each such extension for a six -month period. The Term Loan A matures on January 9, 2019. The foregoing extension options are exercisable by us subject to the satisfaction of certain conditions. On January 9, 2019, we entered into the first amendment (“First Amendment”) to the Second Amended and Restated Credit Facility, which extended the maturity date of Term Loan A to January 9, 2021, subject to three , one -year extension options. Additionally, in connection with the First Amendment, borrowings under the Second Amended and Restated Credit Facility with respect to Term Loan bear interest at floating rates equal to, at our option, either (1) LIBOR , plus a spread which ranges from 1.20% to 1.70% based on our consolidated total leverage ratio, or (2) a base rate equal to the highest of (a) the prime rate , (b) the federal funds rate plus 50 bps or (c) the Eurodollar rate plus 100 bps, in each case plus a spread which ranges from 0.20% to 0.70% based on our consolidated total leverage ratio. The foregoing rates are more favorable than previously contained in the Second Amended and Restated Credit Facility (prior to entry into the First Amendment) with respect to Term Loan A. Additionally, the Second Amended and Restated Credit Facility includes a number of customary financial covenants, including: • A maximum leverage ratio (defined as total indebtedness net of certain cash and cash equivalents to total asset value) of 60% , • A maximum secured leverage ratio (defined as total secured debt to secured total asset value) of 40% , • A minimum fixed charge coverage ratio (defined as consolidated earnings before interest, taxes, depreciation and amortization to consolidated fixed charges) of 1.50x, • A minimum unsecured interest coverage ratio of 1.75x, • A maximum unsecured leverage ratio of 60% , and • Recourse indebtedness at any time cannot exceed 15% of total asset value. The Second Amended and Restated Credit Facility provides that our annual distributions may not exceed the greater of (1) 95% of our FFO or (2) the amount required for us to (a) qualify and maintain our REIT status and (b) avoid the payment of federal or state income or excise tax. If certain events of default exist or would result from a distribution, we may be precluded from making distributions other than those necessary to qualify and maintain our status as a REIT. As of December 31, 2018 , the Operating Partnership was in compliance with all then in-place Second Amended and Restated Credit Facility covenants.

Derivative and Hedging (Notes)

Derivative and Hedging (Notes)	12 Months Ended
	Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
DERIVATIVE AND HEDGING ACTIVITIES	DERIVATIVE AND HEDGING ACTIVITIES Our objectives in using interest rate derivatives are to add stability to interest expense and to manage exposure to interest rate movement. To accomplish these objectives, we use interest rate swaps as part of our interest rate risk management strategy. Interest rate swaps designated as cash flow hedges involve the receipt of variable-rate amounts from a counterparty in exchange for us making fixed-rate payments over the life of the agreements without exchange of the underlying notional amount. Concurrent with the closing of our amended and restated credit facility, we entered into an interest rate swap agreement that is intended to fix the interest rate associated with our term loan of $100 million at approximately 3.08% through its maturity date and extension options, subject to adjustments based on our consolidated leverage ratio. On January 29, 2016, we entered into a forward-starting interest rate swap contract with U.S. Bank National Association to reduce the interest rate variability exposure of the projected interest cash flows of our then prospective $100 million seven-year term loan. The forward-starting seven -year swap contract had a notional amount of $100 million , a termination date of March 1, 2023 , a fixed pay rate of 1.4485% , and a receive rate equal to the one-month LIBOR, with fixed rate payments due monthly commencing April 1, 2016, floating payments due monthly commencing April 1, 2016, and floating reset dates two days prior to the first day of each calculation period. The forward-starting seven-year swap contract accrual period, March 1, 2016 to March 1, 2023 , was designed to match the expected tenor of our then prospective $100 million seven -year term loan, which successfully closed on March 1, 2016. On March 23, 2016, we entered into a forward-starting interest rate swap contract with Wells Fargo Bank, National Association to reduce the interest rate variability exposure of the projected interest cash flows of our then prospective incremental $50 million seven-year term loan. The forward-starting seven -year swap contract had a notional amount of $50 million , a termination date of March 1, 2023 , a fixed pay rate of 1.4410% , and a receive rate equal to the one-month LIBOR, with fixed rate payments due monthly commencing June 1, 2016, floating payments due monthly commencing June 1, 2016, and floating reset dates two days prior to the first day of each calculation period. The forward-starting seven-year swap contract accrual period, May 2, 2016 to March 1, 2023 , was designed to match the expected tenor of our then prospective incremental $50 million seven -year term loan, which successfully closed on May 2, 2016. On March 29, 2016, we entered into a forward-starting interest rate swap contract with Wells Fargo Bank, National Association to reduce the interest rate variability exposure of the projected interest cash flows of our prospective new ten-year debt offering (private placement, investment grade bonds, term loan or otherwise) (anticipated to close on or before March 31, 2017 ). The forward-starting ten -year swap contract had a notional amount of $150 million , a termination date of March 31, 2027 , a fixed pay rate of 1.8800% , and a receive rate equal to the three-month LIBOR, with fixed rate payments due semi-annually commencing September 29, 2017, floating payments due semi-annually commencing September 29, 2017, and floating reset dates the first day of each quarterly period. The forward-starting ten-year swap contract accrual period, March 31, 2017 to March 31, 2027, was designed to match the expected tenor of our prospective new ten -year debt offering (private placement, investment grade bonds, term loan or otherwise). On April 7, 2016, we entered into a forward-starting interest rate swap contract with Wells Fargo Bank, National Association to reduce the interest rate variability exposure of the projected interest cash flows of our prospective new ten-year debt offering (private placement, investment grade bonds, term loan or otherwise) (anticipated to close on or before March 31, 2017 ). The forward-starting ten -year swap contract had a notional amount of $100 million , a termination date of March 31, 2027 , a fixed pay rate of 1.7480% , and a receive rate equal to the three-month LIBOR, with fixed rate payments due semi-annually commencing September 29, 2017, floating payments due semi-annually commencing September 29, 2017, and floating reset dates the first day of each quarterly period. The forward-starting ten-year swap contract accrual period, March 31, 2017 to March 31, 2027, was designed to match the expected tenor of our prospective new ten -year debt offering (private placement, investment grade bonds, term loan or otherwise). On January 18, 2017, we settled the March 29, 2016 $150 million and April 7, 2016 $100 million ten-year forward-starting interest rate swaps resulting in an aggregate gain of approximately $10.4 million . This gain is included in accumulated other comprehensive income and will be amortized to interest expense over the life of the Series D Notes. The forward-starting interest rate swap contracts have been deemed to be highly effective cash flow hedges and we elected to designate all the forward-starting swap contracts as accounting hedges. On April 25, 2017, we entered into a treasury lock contract (the "April 2017 Treasury Lock") with Bank of America, National Association, to reduce the interest rate variability exposure of the projected interest cash flows of our then prospective new twelve -year private placement. The April 2017 Treasury Lock had a notional amount of $100 million , termination date of May 18, 2017, a fixed pay rate of 2.313% , and a receive rate equal to the ten -year treasury rate on the settlement date. On May 11, 2017, we settled the April 2017 Treasury Lock, resulting in a gain of approximately $0.7 million . This gain is included in accumulated other comprehensive income and will be amortized to interest expense over ten years. The April 2017 Treasury Lock has been deemed to be a highly effective cash flow hedge and we elected to designate the April 2017 Treasury Lock as an accounting hedge. On May 31, 2017, we entered into a treasury lock contract (the "May 2017 Treasury Lock") with Bank of America, National Association, to reduce the interest rate variability exposure of the projected interest cash flows of our then prospective new seven -year private placement. The May 2017 Treasury Lock had a notional amount of $100 million , termination date of July 26, 2017 , a fixed pay rate of 2.064% , and a receive rate equal to the seven -year treasury rate on the settlement date. On June 23, 2017, we settled the May 2017 Treasury Lock, resulting in a loss of approximately $0.5 million . This loss is included in accumulated other comprehensive income and will be amortized to interest expense over seven years. The May 2017 Treasury Lock has been deemed to be a highly effective cash flow hedge and we elected to designate the May 2017 Treasury Lock as an accounting hedge. On November 26, 2018, we entered into an interest rate swap agreement with Bank of America, National Association, to fix the interest rate associated with Term Loan A associated with our then prospective First Amendment at approximately 4.13% through its maturity date of January 9, 2021, subject to adjustments based on our consolidated leverage ratio. The forward-starting interest rate swap contracts have been deemed to be highly effective cash flow hedges and we elected to designate all the forward-starting swap contracts as accounting hedges. The following is a summary of the terms of the interest rate swap as of December 31, 2018 (dollars in thousands): Swap Counterparty Notional Amount Effective Date Maturity Date Fair Value Bank of America, N.A. $ 100,000 1/9/2014 1/9/2019 $ 18 U.S. Bank N.A. $ 100,000 3/1/2016 3/1/2023 $ 3,976 Wells Fargo Bank, N.A. $ 50,000 5/2/2016 3/1/2023 $ 2,008 Bank of America, N.A. $ 100,000 1/9/2019 1/9/2021 $ (801 ) The effective portion of changes in the fair value of the derivatives that are designated as cash flow hedges are being recorded as accumulated other comprehensive income and will be subsequently reclassified into earnings during the period in which the hedged forecasted transaction affects earnings. The valuation of these instruments is determined using widely accepted valuation techniques including discounted cash flow analysis on the expected cash flows of the derivative. This analysis reflects the contractual terms of the derivative, including the period to maturity, and uses observable market-based inputs, including interest rate curves, and implied volatilities. The fair value of the interest rate swaps is determined using the market standard methodology of netting the discounted future fixed cash receipts (or payments) and the discounted expected variable cash payments (or receipts). The variable cash payments (or receipts) are based on an expectation of future interest rates (forward curves) derived from observable market interest rate curves.

Partners Capital of American As

Partners Capital of American Assets Trust, L.P. (Notes)	12 Months Ended
	Dec. 31, 2018
Equity [Abstract]
PARTNERS' CAPITAL OF AMERICAN ASSETS TRUST, L.P.	PARTNERS' CAPITAL OF AMERICAN ASSETS TRUST, L.P. As of December 31, 2018 , the Operating Partnership had 17,177,608 common units (the “Noncontrolling Common Units”) outstanding. American Assets Trust, Inc. owned 73.2% of the Operating Partnership at December 31, 2018 . The remaining 26.8% of the partnership interests are owned by non-affiliated investors and certain of our directors and executive officers. Common units and shares of the company's common stock have essentially the same economic characteristics in that common units and shares of the company's common stock share equally in the total net income or loss distributions of the Operating Partnership. American Assets Trust, Inc. is the Operating Partnership’s general partner and is responsible for the management of the Operating Partnership’s business. As the general partner of the Operating Partnership, the company effectively controls the ability to issue common stock of American Assets Trust, Inc. upon a limited partner’s notice of redemption. Investors who own common units have the right to cause the Operating Partnership to redeem any or all of their common units for cash equal to the then-current market value of one share of the company's common stock, or, at the company's election, shares of the company's common stock on a one-for-one basis. In addition, American Assets Trust, Inc. has generally acquired common units upon a limited partner’s notice of redemption in exchange for shares of the company's common stock. The redemption provisions of common units owned by limited partners that permit the Operating Partnership to settle in either cash or common stock at the option of the company are further evaluated in accordance with applicable accounting guidance to determine whether temporary or permanent equity classification on the balance sheet is appropriate. The Operating Partnership evaluated this guidance, including the requirement to settle in unregistered shares, and determined that these common units meet the requirements to qualify for presentation as permanent equity. During the years ended December 31, 2018 , 2017 and 2016 , approximately 17,372 , 693,842 and 10,694 , respectively, common units were converted into shares of the company's common stock.

Equity of American Assets Trust

Equity of American Assets Trust, Inc. (Notes)	12 Months Ended
	Dec. 31, 2018
Equity [Abstract]
EQUITY OF AMERICAN ASSETS TRUST, INC.	EQUITY OF AMERICAN ASSETS TRUST, INC. Stockholders' Equity On May 6, 2013, we entered into an at-the-market (“ATM”) equity program with four sales agents pursuant to which we may, from time to time, offer and sell shares of our common stock having an aggregate offering price of up to $150.0 million . We completed $150.0 million of issuances under such ATM program on May 21, 2015. On May 27, 2015, we entered into a new ATM equity program with five sales agents under which we may, from time to time, offer and sell shares of our common stock having an aggregate offering price of up to $250.0 million . The sales of shares of our common stock made through the ATM equity program are made in "at-the-market" offerings as defined in Rule 415 of the Securities Act of 1933, as amended. For the year ended December 31, 2018 , no shares of common stock were sold through the ATM equity program. As of December 31, 2018 , we had the capacity to issue up to an additional $176.2 million in shares of our common stock under our active ATM equity program. Actual future sales will depend on a variety of factors including, but not limited to, market conditions, the trading price of our common stock and our capital needs. We have no obligation to sell the remaining shares available for sale under the active ATM equity program. Preferred Stock Authorized Shares We have been authorized to issue 10,000,000 shares of preferred stock with a par value of $0.01 , of which no shares were outstanding at December 31, 2018 . Upon issuance, our board of directors has the ability to define the terms of the preferred shares, including voting rights, liquidation preferences, conversion and redemption provisions and dividend rates. Dividends The following table lists the dividends declared and paid on our shares of common stock and Noncontrolling Common Units for the years ended December 31, 2018 , 2017 and 2016 : Period Amount per Share/Unit Period Covered Dividend Paid Date First Quarter 2016 $ 0.25 January 1, 2016 to March 31, 2016 March 25, 2016 Second Quarter 2016 $ 0.25 April 1, 2016 to June 30, 2016 June 24, 2016 Third Quarter 2016 $ 0.25 July 1, 2016 to September 30, 2016 September 29, 2016 Fourth Quarter 2016 $ 0.26 October 1, 2016 to December 31, 2016 December 22, 2016 First Quarter 2017 $ 0.26 January 1, 2017 to March 31, 2017 March 30, 2017 Second Quarter 2017 $ 0.26 April 1, 2017 to June 30, 2017 June 29, 2017 Third Quarter 2017 $ 0.26 July 1, 2017 to September 30, 2017 September 28, 2017 Fourth Quarter 2017 $ 0.27 October 1, 2017 to December 31, 2017 December 21, 2017 First Quarter 2018 $ 0.27 January 1, 2018 to March 31, 2018 March 19, 2018 Second Quarter 2018 $ 0.27 April 1, 2018 to June 30, 2018 June 28, 2018 Third Quarter 2018 $ 0.27 July 1, 2018 to September 30, 2018 September 27, 2018 Fourth Quarter 2018 $ 0.28 October 1, 2018 to December 31, 2018 December 27, 2018 Taxability of Dividends Earnings and profits, which determine the taxability of distributions to stockholders and holders of common units, may differ from income reported for financial reporting purposes due to the differences for federal income tax purposes in the treatment of loss on extinguishment of debt, revenue recognition and compensation expense and in the basis of depreciable assets and estimated useful lives used to compute depreciation. A summary of the income tax status of dividends per share paid is as follows: Year Ended December 31, 2018 2017 2016 Per Share % Per Share % Per Share % Ordinary income $ 1.05 96.3 % $ 1.05 100.0 % $ 1.01 100.0 % Capital gain — — % — — % — — % Return of capital 0.04 3.7 % — — % — — % Total $ 1.09 100.0 % $ 1.05 100.0 % $ 1.01 100.0 % Stock-Based Compensation The company has established the 2011 Equity Incentive Award Plan (the "2011 Plan"), which provides for grants to directors, employees and consultants of the company and the Operating Partnership of stock options, restricted stock, dividend equivalents, stock payments, performance shares, LTIP units, stock appreciation rights and other incentive awards. An aggregate of 4,054,411 shares of our common stock are authorized for issuance under awards granted pursuant to the 2011 Plan, and as of December 31, 2018 , 2,595,189 shares of common stock remain available for future issuance. The following shares of restricted common stock have been issued as of December 31, 2018 : Grant Fair Value at Grant Date Number June 14, 2016 (1) $40.81 4,900 December 1, 2016 (2) $28.24 - $35.71 143,210 June 13, 2017 (1) $40.99 4,880 December 15, 2017 (3) $27.27 145,218 June 12, 2018 (1) $37.58 5,320 December 6, 2018 (4) $25.68 - $28.18 199,790 (1) Restricted common stock issued to members of the company's non-employee directors. These awards of restricted stock will vest subject to the director's continued service on the Board of Directors on the earlier of (i) the one year anniversary of the date of grant or (ii) the date of the next annual meeting of our stockholders, if such non-employee director continues his or her service on the Board of Directors until the next annual meeting of stockholders, but not thereafter, pursuant to our independent director compensation policy. (2) Restricted common stock issued to certain of the company's senior management and other employees, which are subject to pre-defined market specific performance criteria based vesting. Up to one-third of the shares of restricted stock may vest based on performance calculations determined as of November 30, 2017, 2018 and 2019, subject to the employee's continued employment on those dates. (3) Restricted common stock issued to certain of the company's senior management and other employees, which are subject to pre-defined market specific performance criteria based vesting. Shares of restricted stock may vest based on performance calculations determined as of November 30, 2018, subject to the employee's continued employment on that date. (4) Restricted common stock issued to certain of the company's senior management and other employees, which are subject to quantitative and qualitative performance criteria based vesting. Up to one-third of the shares of restricted stock may vest based on such performance criteria determined as of November 30, 2019, 2020 and 2021, subject to the employee's continued employment on those dates. For the performance-based stock awards, the fair value of the awards was estimated using a Monte Carlo Simulation model. Our stock price, along with the stock prices of the group of peer REITs, is assumed to follow the Multivariate Geometric Brownian Motion Process. Multivariate Geometric Brownian Motion is a common assumption when modeling in financial markets, as it allows the modeled quantity (in this case, the stock price) to vary randomly from its current value and take any value greater than zero. The volatilities of the returns on the stock price of the company and the group REITs were estimated based on a three year look-back period. The expected growth rate of the stock prices over the “derived service period” of the employee is determined with consideration of the risk free rate as of the grant date. For the restricted stock grants that are time-vesting, we estimate the stock compensation expense based on the fair value of the stock at the grant date. The following table summarizes the activity of non-vested restricted stock awards during the year ended December 31, 2018 : 2018 Units Weighted Average Grant Date Fair Value Balance at beginning of year 268,768 $ 29.89 Granted 205,110 27.25 Vested (52,810 ) 30.04 Forfeited (78,975 ) 29.70 Balance at end of year 342,093 $ 28.33 We recognize noncash compensation expense ratably over the vesting period, and accordingly, we recognized $3.0 million , $4.7 million and $2.4 million in noncash compensation expense for the years ended December 31, 2018 , 2017 and 2016 , respectively, each of which is included in general and administrative expense on the statement of income. Unrecognized compensation expense was $6.5 million at December 31, 2018 , which will be recognized over a weighted-average period of 1.6 years. Earnings Per Share We have calculated earnings per share (“EPS”) under the two-class method. The two-class method is an earnings allocation methodology whereby EPS for each class of common stock and participating security is calculated according to dividends declared and participation rights in undistributed earnings. For the years ended December 31, 2018 , 2017 and 2016 , we had a weighted average of approximately 271,905 shares, 230,602 shares and 176,408 unvested shares outstanding, respectively, which are considered participating securities. Therefore, we have allocated our earnings for basic and diluted EPS between common shares and unvested shares. Diluted EPS is calculated by dividing the net income attributable to common stockholders for the period by the weighted average number of common and dilutive instruments outstanding during the period using the treasury stock method. For the year ended December 31, 2018 , diluted shares exclude incentive restricted stock as these awards are considered contingently issuable. Additionally, the unvested restricted stock awards subject to time vesting are anti-dilutive for all periods presented and accordingly, have been excluded from the weighted average common shares used to compute diluted EPS. Earnings Per Unit of the Operating Partnership Basic earnings (loss) per unit (“EPU”) of the Operating Partnership is computed by dividing income (loss) applicable to unitholders by the weighted average Operating Partnership units outstanding, as adjusted for the effect of participating securities. Operating Partnership units granted in equity-based payment transactions are considered participating securities prior to vesting. The impact of unvested Operating Partnership unit awards on EPU has been calculated using the two-class method whereby earnings are allocated to the unvested Operating Partnership unit awards based on distributions and the unvested Operating Partnership units’ participation rights in undistributed earnings (losses). The calculation of diluted earnings per unit for the year ended December 31, 2018 , 2017 and 2016 does not include 271,905 units, 230,602 units, and 176,408 unvested weighted average Operating Partnership units, respectively, as these equity securities are either considered contingently issuable or the effect of including these equity securities was anti-dilutive. The computation of basic and diluted EPS for American Assets Trust, Inc. is presented below (dollars in thousands, except share and per share amounts): Year Ended December 31, 2018 2017 2016 NUMERATOR Net income from operations $ 27,202 $ 40,132 $ 45,637 Less: Net income attributable to restricted shares (311 ) (241 ) (189 ) Less: Income from operations attributable to unitholders in the Operating Partnership (7,205 ) (10,814 ) (12,863 ) Net income attributable to common stockholders—basic $ 19,686 $ 29,077 $ 32,585 Income from operations attributable to American Assets Trust, Inc. common stockholders—basic $ 19,686 $ 29,077 $ 32,585 Plus: Income from operations attributable to unitholders in the Operating Partnership 7,205 10,814 12,863 Net income attributable to common stockholders—diluted $ 26,891 $ 39,891 $ 45,448 DENOMINATOR Weighted average common shares outstanding—basic 46,950,812 46,715,520 45,332,471 Effect of dilutive securities—conversion of Operating Partnership units 17,185,747 17,371,730 17,895,688 Weighted average common shares outstanding—diluted 64,136,559 64,087,250 63,228,159 Earnings per common share, basic $ 0.42 $ 0.62 $ 0.72 Earnings per common share, diluted $ 0.42 $ 0.62 $ 0.72

Income Taxes (Notes)

Income Taxes (Notes)	12 Months Ended
	Dec. 31, 2018
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES We elected to be taxed as a REIT and operate in a manner that allows us to qualify as a REIT, for federal income tax purposes commencing with our taxable year ending December 31, 2011. As a REIT, we are generally not subject to corporate level income tax on the earnings distributed currently to our stockholders that we derive from our REIT qualifying activities. Taxable income from non-REIT activities managed through our TRS is subject to federal and state income taxes. We lease our hotel property to a wholly owned TRS that is subject to federal and state income taxes. We account for income taxes using the asset and liability method, under which deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between GAAP carrying amounts and their respective tax bases. Additionally, we classify certain state taxes as income taxes for financial reporting purposes in accordance with ASC Topic 740, Income Taxes. A deferred tax liability is included in our consolidated balance sheets of $0.1 million and $0.1 million as of December 31, 2018 and 2017 , respectively, in relation to real estate asset basis differences and prepaid expenses for our TRS. The income tax provision included in other income (expense) on the consolidated statement of income is as follows (in thousands): Year Ended December 31, 2018 Year Ended December 31, 2017 Year Ended December 31, 2016 Current: Federal $ 60 $ — $ 132 State 465 422 341 Deferred: Federal $ (6 ) $ — $ — State (192 ) (208 ) 93 Provision for income taxes $ 327 $ 214 $ 566

Commitments and Contingencies (

Commitments and Contingencies (Notes)	12 Months Ended
	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES Legal We are sometimes involved in various disputes, lawsuits, warranty claims, environmental and other matters arising in the ordinary course of business. Management makes assumptions and estimates concerning the likelihood and amount of any potential loss relating to these matters. We are currently a party to various legal proceedings. We accrue a liability for litigation if an unfavorable outcome is probable and the amount of loss can be reasonably estimated. If an unfavorable outcome is probable and a reasonable estimate of the loss is a range, we accrue the best estimate within the range; however, if no amount within the range is a better estimate than any other amount, the minimum within the range is accrued. Legal fees related to litigation are expensed as incurred. We do not believe that the ultimate outcome of these matters, either individually or in the aggregate, could have a material adverse effect on our financial position or overall trends in results of operations; however, litigation is subject to inherent uncertainties. Also, under our leases, tenants are typically obligated to indemnify us from and against all liabilities, costs and expenses imposed upon or asserted against us as owner of the properties due to certain matters relating to the operation of the properties by the tenant. Commitments At The Landmark at One Market, we lease, as lessee, a building adjacent to The Landmark under an operating lease effective through June 30, 2021, which we have the option to extend until 2031 by way of two five -year extension options. At Waikiki Beach Walk, we sublease a portion of the building of which Quiksilver is currently in possession, under an operating lease effective through December 31, 2021. Current minimum annual payments under the leases are as follows, as of December 31, 2018 (in thousands): 2019 $ 3,347 2020 3,422 2021 2,153 2022 — 2023 — Thereafter — Total $ 8,922 We have management agreements with Outrigger Hotels & Resorts or an affiliate thereof (“Outrigger”) pursuant to which Outrigger manages each of the retail and hotel portions of the Waikiki Beach Walk property. Under the management agreement with Outrigger relating to the retail portion of Waikiki Beach Walk (the “retail management agreement”), we pay Outrigger a monthly management fee of 3.0% of net revenues from the retail portion of Waikiki Beach Walk. Pursuant to the terms of the retail management agreement, if the agreement is terminated in certain instances, including our election not to repair damage or destruction at the property, a condemnation or our failure to make required working capital infusions, we would be obligated to pay Outrigger a termination fee equal to the sum of the management fees paid for the two calendar months immediately preceding the termination date. The retail management agreement may not be terminated by us or by Outrigger without cause. Under our management agreement with Outrigger relating to the hotel portion of Waikiki Beach Walk (the “hotel management agreement”), we pay Outrigger a monthly management fee of 6.0% of the hotel's gross operating profit, as well as 3.0% of the hotel's gross revenues; provided that the aggregate management fee payable to Outrigger for any year shall not exceed 3.5% of the hotel's gross revenues for such fiscal year. Pursuant to the terms of the hotel management agreement, if the agreement is terminated in certain instances, including upon a transfer by us of the hotel or upon a default by us under the hotel management agreement, we would be required to pay a cancellation fee calculated by multiplying (1) the management fees for the previous 12 months by (2) (a) eight , if the agreement is terminated in the first 11 years of its term, or (b) four , three , two or one , if the agreement is terminated in the twelfth, thirteenth, fourteenth or fifteenth year, respectively, of its term. The hotel management agreement may not be terminated by us or by Outrigger without cause. A wholly owned subsidiary of our Operating Partnership, WBW Hotel Lessee LLC, entered into a franchise license agreement with Embassy Suites Franchise LLC, the franchisor of the brand “Embassy Suites™,” to obtain the non-exclusive right to operate the hotel under the Embassy Suites brand for 20 years. The franchise license agreement provides that WBW Hotel Lessee LLC must comply with certain management, operational, record keeping, accounting, reporting and marketing standards and procedures. In connection with this agreement, we are also subject to the terms of a product improvement plan pursuant to which we expect to undertake certain actions to ensure that our hotel's infrastructure is maintained in compliance with the franchisor's brand standards. In addition, we must pay to Embassy Suites Franchise LLC a monthly franchise royalty fee equal to 4.0% of the hotel's gross room revenue through December 2021 and 5.0% of the hotel's gross room revenue thereafter, as well as a monthly program fee equal to 4.0% of the hotel's gross room revenue. If the franchise license is terminated due to our failure to make required improvements or to otherwise comply with its terms, we may be liable to the franchisor for a termination payment, which could be as high as $7.6 million based on operating performance through December 31, 2018 . Our Del Monte Center property has ongoing environmental remediation related to ground water contamination. The environmental issue existed at purchase and is currently in the final stages of remediation. The final stages of the remediation will include routine, long term ground monitoring by the appropriate regulatory agency over the next five to seven years. The work performed is financed through an escrow account funded by the seller upon our purchase of the Del Monte Center. We believe the funds in the escrow account are sufficient for the remaining work to be performed. However, if further work is required costing more than the remaining escrow funds, we could be required to pay such overage, although we may have a contractual claim for such costs against the prior owner or our environmental remediation consultant. As of December 31, 2018 , the company accrued approximately $6.6 million for transfer taxes in connection with its Offering. The company believes that it has filed all necessary forms with the requisite taxing authorities. Concentrations of Credit Risk Our properties are located in Southern California, Northern California, Hawaii, Oregon, Texas and Washington. The ability of the tenants to honor the terms of their respective leases is dependent upon the economic, regulatory and social factors affecting the markets in which the tenants operate. Fourteen of our consolidated properties, representing 33.6% of our total revenue for the year ended December 31, 2018 , are located in Southern California, which exposes us to greater economic risks than if we owned a more geographically diverse portfolio. Our mixed-use property located in Honolulu, Hawaii accounted for 18.8% of total revenues for the year ended December 31, 2018 . Tenants in the retail industry accounted for 31.9% and 33.0% of total revenues for the years December 31, 2018 and 2017 , respectively. This makes us susceptible to demand for retail rental space and subject to the risks associated with an investment in real estate with a concentration of tenants in the retail industry. Two retail properties, Alamo Quarry Market and Waikele Center, accounted for 11.7% and 13.2% of total revenues for the years ended December 31, 2018 and 2017 , respectively. Tenants in the office industry accounted for 34.0% and 33.6% of total revenues for the years December 31, 2018 and 2017 , respectively. This makes us susceptible to demand for office rental space and subject to the risks associated with an investment in real estate with a concentration of tenants in the office industry. For the years ended December 31, 2018 and 2017 , no tenant accounted for more than 10.0% of our total rental revenue. At December 31, 2018 , salesforce.com, inc. at The Landmark at One Market accounted for 8.2% of total annualized base rent. Three other tenants ( Autodesk, Inc. , Lowe's , and Veterans Benefits Administration ) comprise 8.8% of our total annualized base rent at December 31, 2018 , in the aggregate. No other tenants represent greater than 2.0% of our total annualized base rent. Total annualized base rent used for the percentage calculations includes the annualized base rent as of December 31, 2018 for our office properties, retail properties and the retail portion of our mixed-use property.

Operating Leases (Notes)

Operating Leases (Notes)	12 Months Ended
	Dec. 31, 2018
Leases, Operating [Abstract]
OPERATING LEASES	OPERATING LEASES At December 31, 2018 , our retail, office and mixed-use properties are located in five states: California, Oregon, Hawaii, Washington and Texas. At December 31, 2018 , we had approximately 811 leases with office and retail tenants, including the retail portion of our mixed-use property. Our multifamily properties are located in Southern California, and we had approximately 1,866 leases with residential tenants at December 31, 2018 , excluding Santa Fe Park RV Resort. Our leases with office, retail, mixed-use and residential tenants are classified as operating leases. Leases at our office and retail properties and the retail portion of our mixed-use property generally range from three to ten years (certain leases with anchor tenants may be longer), and in addition to minimum rents, usually provide for cost recoveries for the tenant's share of certain operating costs and also may include percentage rents based on the tenant's level of sales achieved. Leases on apartments generally range from seven to fifteen months, with a majority having 12 month lease terms. Rooms at the hotel portion of our mixed-use property are rented on a nightly basis. As of December 31, 2018 , minimum future rentals from noncancelable operating leases before any reserve for uncollectible amounts and assuming no early lease terminations, at our office and retail properties and the retail portion of our mixed-use property are as follows for the years ended December 31 (in thousands): 2019 $ 177,144 2020 172,821 2021 157,611 2022 138,787 2023 116,985 Thereafter 412,934 Total $ 1,176,282 The above future minimum rentals exclude residential leases, which are typically range from seven to fifteen months, and exclude the hotel, as rooms are rented on a nightly basis.

Component of Rental Income and

Component of Rental Income and Expense (Notes)	12 Months Ended
	Dec. 31, 2018
Operating Leases, Income Statement, Lease Revenue [Abstract]
COMPONENTS OF RENTAL INCOME AND EXPENSE	COMPONENTS OF RENTAL INCOME AND EXPENSE The principal components of rental income are as follows (in thousands): Year Ended December 31, 2018 2017 2016 Minimum rents Retail $ 77,147 $ 76,201 $ 74,050 Office 95,081 93,128 90,281 Multifamily 46,897 40,217 26,962 Mixed-Use 11,019 10,564 10,616 Cost reimbursement 34,584 34,267 33,610 Percentage rent 3,149 3,214 3,096 Hotel revenue 40,049 39,545 39,371 Other 1,611 1,667 1,512 Total rental income $ 309,537 $ 298,803 $ 279,498 Minimum rents include $2.4 million , $0.8 million and $0.8 million for the years ended December 31, 2018 , 2017 and 2016 , respectively, to recognize minimum rents on a straight-line basis. In addition, minimum rents include $3.6 million , $3.3 million and $3.5 million for the years ended December 31, 2018 , 2017 and 2016 , respectively, to recognize the amortization of above and below market leases. The principal components of rental expenses are as follows (in thousands): Year Ended December 31, 2018 2017 2016 Rental operating $ 37,322 $ 34,944 $ 31,709 Hotel operating 24,030 24,254 23,607 Repairs and maintenance 13,486 13,136 12,705 Marketing 2,108 2,053 2,117 Rent 3,216 3,119 2,925 Hawaii excise tax 4,333 4,454 4,511 Management fees 1,987 2,046 1,979 Total rental expenses $ 86,482 $ 84,006 $ 79,553

Other Income (Expenses) (Notes)

Other Income (Expenses) (Notes)	12 Months Ended
	Dec. 31, 2018
Other Income and Expenses [Abstract]
OTHER INCOME (EXPENSE)	OTHER INCOME (EXPENSE) The principal components of other income (expense), net are as follows (in thousands): Year Ended December 31, 2018 2017 2016 Interest and investment income $ 238 $ 548 $ 72 Income tax expense (327 ) (214 ) (566 ) Other non-operating income 4 — 126 Total other income (expense) $ (85 ) $ 334 $ (368 )

Related Party Transactions (Not

Related Party Transactions (Notes)	12 Months Ended
	Dec. 31, 2018
Related Party Transactions [Abstract]
RELATED PARTY TRANSACTIONS	RELATED PARTY TRANSACTIONS At Torrey Reserve Campus, we previously leased space to ICW, an entity owned and controlled by Ernest Rady. Rental revenue recognized on the leases of $0.1 million , $0.1 million and $2.2 million for the years ended December 31, 2018 , 2017 and 2016 , respectively, is included in rental income. Additionally, on July 1, 2014, we entered into a workers' compensation insurance policy with ICW. The policy premium was approximately $0.4 million for the period July 1, 2014 through July 1, 2015. We renewed this policy with ICW on July 1, 2015 and the premium was approximately $0.2 million for the period July 1, 2015 through July 1, 2016. We renewed this policy with ICW on July 1, 2016 and the premium was approximately $0.2 million for the period July 1, 2016 through July 1, 2017. We renewed this policy with ICW on June 30, 2017 and the premium is approximately $0.2 million for the period July 1, 2017 through July 1, 2018. We did not renew this policy with ICW during the second quarter of 2018 and commencing July 1, 2018, we entered into a workers' compensation policy with an unaffiliated third-party insurer. At Torrey Reserve Campus, we lease space to American Assets, Inc., an entity owned and controlled by Ernest Rady. Rental revenue recognized on the lease of $0.1 million for both the years ended December 31, 2018 and 2017 is included in rental income. At Torrey Reserve Campus, we lease space to EDisability, LLC, an entity majority owned and controlled by Ernest Rady. Rent revenue recognized on the lease of $0.1 million for the year ended December 31, 2018 is included in rental income. On occasion, the company utilizes aircraft services provided by AAI Aviation, Inc. ("AAIA"), an entity owned and controlled by Ernest Rady. For the years ending December 31, 2018 , 2017 and 2016 , we incurred approximately $0.1 million , $0.1 million and $0.2 million , respectively, of expenses related to aircraft services of AAIA or reimbursement to Mr. Rady (or his trust) for use of the aircraft owned by AAIA. These expenses are recorded as general and administrative expenses in our consolidated statements of comprehensive income. As of December 31, 2018 , Mr. Rady and his affiliates owned approximately 14.0% of our outstanding common stock and 23.1% of our outstanding common units, which together represent an approximate 37% beneficial interest in our company on a fully diluted basis. The Waikiki Beach Walk entities have a 47.7% investment in WBW CHP LLC, an entity that was formed to, among other things, construct a chilled water plant to provide air conditioning to the property and other adjacent facilities. The operating expenses of WBW CHP LLC are recovered through reimbursements from its members, and reimbursements to WBW CHP LLC of $1.1 million , $1.0 million and $0.9 million were made for the years ended December 31, 2018 , 2017 and 2016 , respectively, and included in rental expenses on the statements of income.

Segment Reporting (Notes)

Segment Reporting (Notes)	12 Months Ended
	Dec. 31, 2018
Segment Reporting [Abstract]
SEGMENT REPORTING	SEGMENT REPORTING Segment information is prepared on the same basis that our management reviews information for operational decision-making purposes. We review operating and financial information for each property on an individual basis and therefore, each property represents an individual operating segment. However, we have aggregated our properties into reportable segments as the properties share similar long-term economic characteristics and have other similarities including the fact that they are operated using consistent business strategies. We operate in four business segments: the acquisition, redevelopment, ownership and management of retail real estate, office real estate, multifamily real estate and mixed-use real estate. The products for our retail segment primarily include rental of retail space and other tenant services, including tenant reimbursements, parking and storage space rental. The products for our office segment primarily include rental of office space and other tenant services, including tenant reimbursements, parking and storage space rental. The products for our multifamily segment include rental of apartments and other tenant services. The products of our mixed-use segment include rental of retail space and other tenant services, including tenant reimbursements, parking and storage space rental and operation of a 369 -room all-suite hotel. We evaluate the performance of our segments based on segment profit which is defined as property revenue less property expenses. We do not use asset information as a measure to assess performance and make decisions to allocate resources. Therefore, depreciation and amortization expense is not allocated among segments. General and administrative expenses, interest expense, depreciation and amortization expense and other income and expense are not included in segment profit as our internal reporting addresses these items on a corporate level. Segment profit is not a measure of operating income or cash flows from operating activities as measured by GAAP, and it is not indicative of cash available to fund cash needs and should not be considered an alternative to cash flows as a measure of liquidity. Not all companies calculate segment profit in the same manner. We consider segment profit to be an appropriate supplemental measure to net income because it assists both investors and management in understanding the core operations of our properties. The following table represents operating activity within our reportable segments (in thousands): Year Ended December 31, 2018 2017 2016 Total Retail Property revenue $ 105,552 $ 103,968 $ 100,982 Property expense (30,078 ) (28,524 ) (27,934 ) Segment profit 75,474 75,444 73,048 Total Office Property revenue 112,362 105,694 103,254 Property expense (33,860 ) (33,120 ) (31,839 ) Segment profit 78,502 72,574 71,415 Total Multifamily Property revenue 50,627 43,533 29,188 Property expense (20,441 ) (17,898 ) (12,498 ) Segment profit 30,186 25,635 16,690 Total Mixed-Use Property revenue 62,326 61,788 61,664 Property expense (37,076 ) (37,135 ) (35,660 ) Segment profit 25,250 24,653 26,004 Total segments’ profit $ 209,412 $ 198,306 $ 187,157 The following table is a reconciliation of segment profit to net income attributable to stockholders (in thousands): Year Ended December 31, 2018 2017 2016 Total segments' profit $ 209,412 $ 198,306 $ 187,157 General and administrative (22,784 ) (21,382 ) (17,897 ) Depreciation and amortization (107,093 ) (83,278 ) (71,319 ) Interest expense (52,248 ) (53,848 ) (51,936 ) Other income (expense), net (85 ) 334 (368 ) Net income 27,202 40,132 45,637 Net income attributable to restricted shares (311 ) (241 ) (189 ) Net income attributable to unitholders in the Operating Partnership (7,205 ) (10,814 ) (12,863 ) Net income attributable to American Assets Trust, Inc. stockholders $ 19,686 $ 29,077 $ 32,585 The following table shows net real estate and secured note payable balances for each of the segments, along with their capital expenditures for each year (in thousands): December 31, 2018 December 31, 2017 Net real estate Retail $ 628,734 $ 658,654 Office 822,574 813,121 Multifamily 412,042 424,044 Mixed-Use 176,503 180,888 $ 2,039,853 $ 2,076,707 Secured Notes Payable (1) Retail $ 35,008 $ 35,737 Office 147,757 170,408 Multifamily — 73,744 Mixed-Use — — $ 182,765 $ 279,889 Capital Expenditures (2) Retail $ 14,219 $ 10,412 Office 45,192 35,023 Multifamily 3,659 6,318 Mixed-Use 1,277 670 $ 64,347 $ 52,423 (1) Excludes unamortized debt issuance costs of $0.2 million and $0.3 million as of December 31, 2018 and 2017 , respectively. (2) Capital expenditures represent cash paid for capital expenditures during the year and includes leasing commissions paid.

Quarterly Financial Information

Quarterly Financial Information (Unaudited) (Notes)	12 Months Ended
	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
QUARTERLY FINANCIAL INFORMATION (UNAUDITED)	QUARTERLY FINANCIAL INFORMATION (UNAUDITED) The tables below reflect selected American Assets Trust, Inc. quarterly information for 2018 and 2017 (in thousands, except per shares data): Three Months Ended December 31, September 30, June 30, March 31, Total revenue $ 82,605 $ 82,507 $ 85,023 $ 80,732 Operating income 22,091 27,275 17,249 12,920 Net income (loss) 9,209 14,271 4,413 (691 ) Net (income) loss attributable to restricted shares (96 ) (71 ) (216 ) 72 Net (income) loss attributable to unitholders in the Operating Partnership (2,440 ) (3,806 ) (1,125 ) 166 Net income (loss) attributable to American Assets Trust, Inc. stockholders $ 6,673 $ 10,394 $ 3,072 $ (453 ) Net income (loss) per share attributable to common stockholders - basic and diluted $ 0.14 $ 0.22 $ 0.07 $ (0.01 ) Three Months Ended December 31, September 30, June 30, March 31, Total revenue $ 81,746 $ 82,339 $ 77,106 $ 73,792 Operating income 23,792 26,477 20,048 23,329 Net income 9,731 12,505 7,588 10,308 Net income attributable to restricted shares (60 ) (60 ) (61 ) (60 ) Net income attributable to unitholders in the Operating Partnership (2,594 ) (3,351 ) (2,008 ) (2,861 ) Net income attributable to American Assets Trust, Inc. stockholders $ 7,077 $ 9,094 $ 5,519 $ 7,387 Net income per share attributable to common stockholders - basic and diluted $ 0.15 $ 0.19 $ 0.12 $ 0.16 The tables below reflect selected American Assets Trust, L.P. quarterly information for 2018 and 2017 (in thousands, except per shares data): Three Months Ended December 31, September 30, June 30, March 31, Total revenue $ 82,605 $ 82,507 $ 85,023 $ 80,732 Operating income 22,091 27,275 17,249 12,920 Net income 9,209 14,271 4,413 (691 ) Net income attributable to restricted shares (96 ) (71 ) (216 ) 72 Net income attributable to American Assets Trust, L.P. unit holders $ 9,113 $ 14,200 $ 4,197 $ (619 ) Net income per unit attributable to unit holders - basic and diluted $ 0.14 $ 0.22 $ 0.07 $ (0.01 ) Three Months Ended December 31, September 30, June 30, March 31, Total revenue $ 81,746 $ 82,339 $ 77,106 $ 73,792 Operating income 23,792 26,477 20,048 23,329 Net income 9,731 12,505 7,588 10,308 Net income attributable to restricted shares (60 ) (60 ) (61 ) (60 ) Net income attributable to American Assets Trust, L.P. unit holders $ 9,671 $ 12,445 $ 7,527 $ 10,248 Net income per unit attributable to common unit holders - basic and diluted $ 0.15 $ 0.19 $ 0.12 $ 0.16

Subsequent Events (Notes)

Subsequent Events (Notes)	12 Months Ended
	Dec. 31, 2018
Subsequent Events [Abstract]
SUBSEQUENT EVENTS	SUBSEQUENT EVENTS On January 9, 2019, we entered into the first amendment (“First Amendment”) to the Second Amended and Restated Credit Facility, which extended the maturity date of Term Loan A to January 9, 2021, subject to three , one -year extension options. Additionally, in connection with the First Amendment, borrowings under the Second Amended and Restated Credit Facility with respect to Term Loan bear interest at floating rates equal to, at our option, either (1) LIBOR , plus a spread which ranges from 1.20% to 1.70% based on our consolidated total leverage ratio, or (2) a base rate equal to the highest of (a) the prime rate , (b) the federal funds rate plus 50 bps or (c) the Eurodollar rate plus 100 bps, in each case plus a spread which ranges from 0.20% to 0.70% based on our consolidated total leverage ratio. The foregoing rates are more favorable than previously contained in the Second Amended and Restated Credit Facility (prior to entry into the First Amendment) with respect to Term Loan A. On January 23, 2019, we recorded the deed to the former Sears building at Carmel Mountain Plaza in connection with a ground lease termination agreement with the former ground lessee. In connection therewith, we recognized approximately $4.4 million of lease termination fees in January 2019.

SCHEDULE III-Consolidated Real

SCHEDULE III-Consolidated Real Estate and Accumulated Depreciation (Notes)	12 Months Ended
	Dec. 31, 2018
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation Disclosure [Abstract]
SCHEDULE III-Consolidated Real Estate and Accumulated Depreciation	Encumbrance as of December 31, 2018 Initial Cost Cost Capitalized Subsequent to Acquisition Gross Carrying Amount at December 31, 2018 Accumulated Depreciation and Amortization Year Built/ Renovated Date Acquired Life on which depreciation in latest income statements is computed Description Land Building and Improvements Land Building and Improvements Alamo Quarry Market $ — $ 26,396 $ 109,294 $ 17,370 $ 26,816 $ 126,244 $ (57,885 ) 1997/1999 12/9/2003 35 years Carmel Country Plaza — 4,200 — 12,806 4,200 12,806 (8,251 ) 1991 1/10/1989 35 years Carmel Mountain Plaza — 22,477 65,217 29,434 31,035 86,093 (41,264 ) 1994/2014 3/28/2003 35 years Del Monte Center — 27,412 87,570 32,894 27,117 120,759 (62,170 ) 1967/1984/2006 4/8/2004 35 years Gateway Marketplace — 17,363 21,644 1,097 17,363 22,741 (1,199 ) 1997/2016 7/6/2017 35 years Geary Marketplace — 8,239 12,353 167 8,238 12,521 (2,396 ) 2012 12/19/2012 35 years Hassalo on Eighth - Retail — — — 28,364 597 27,767 (3,668 ) 2015 7/1/2011 35 years Lomas Santa Fe Plaza — 8,600 11,282 13,421 8,620 24,683 (16,348 ) 1972/1997 6/12/1995 35 years The Shops at Kalakaua — 13,993 10,817 (6 ) 14,006 10,798 (4,366 ) 1971/2006 3/31/2005 35 years Solana Beach Towne Centre 35,008 40,980 38,842 3,158 40,980 42,000 (10,827 ) 1973/2000/2004 1/19/2011 35 years South Bay Marketplace — 4,401 — 11,931 4,401 11,931 (7,311 ) 1997 9/16/1995 35 years Waikele Center — 55,593 126,858 29,202 70,643 141,010 (57,608 ) 1993/2008 9/16/2004 35 years City Center Bellevue 111,000 25,135 190,998 36,074 25,135 227,072 (43,740 ) 1987 8/21/2012 40 years First & Main — 14,697 109,739 7,690 14,697 117,429 (28,457 ) 2010 3/11/2011 40 years The Landmark at One Market — 34,575 141,196 6,800 34,575 147,996 (37,857 ) 1917/2000 6/30/2010 40 years Lloyd District Portfolio — 18,660 61,401 69,444 11,845 137,660 (28,415 ) 1940-2015 7/1/2011 40 years One Beach Street — 15,332 18,017 2,723 15,332 20,740 (4,965 ) 1924/1972/1987/1992 1/24/2012 40 years Solana Beach Corporate Centre: Solana Beach Corporate Centre I-II 10,502 7,111 17,100 6,076 7,111 23,176 (5,563 ) 1982/2005 1/19/2011 40 years Solana Beach Corporate Centre III-IV — 7,298 27,887 3,199 7,298 31,086 (7,516 ) 1982/2005 1/19/2011 40 years Solana Beach Corporate Centre Land — 487 — 60 547 — — N/A 1/19/2011 N/A Torrey Reserve Campus: Torrey Plaza — 4,095 — 49,281 5,408 47,968 (16,524 ) 1996-1997/2014 6/6/1989 40 years Pacific North Court 19,620 3,263 — 24,116 4,309 23,070 (11,740 ) 1997-1998 6/6/1989 40 years Pacific South Court — 3,285 — 37,800 4,226 36,859 (13,105 ) 1996-1997 6/6/1989 40 years Pacific VC 6,635 1,413 — 9,736 2,148 9,001 (4,901 ) 1998/2000 6/6/1989 40 years Pacific Torrey Daycare — 715 — 1,843 911 1,647 (902 ) 1996-1997 6/6/1989 40 years Torrey Reserve Building 6 — — — 7,992 682 7,310 (1,485 ) 2013 6/6/1989 40 years Torrey Reserve Building 5 — — — 3,937 1,017 2,920 (214 ) 2014 6/6/1989 40 years Torrey Reserve Building 13 & 14 — — — 15,587 2,188 13,399 (1,207 ) 2015 6/6/1989 40 years Torrey Point — 2,073 741 41,985 6,037 38,762 (395 ) 2018 5/9/1997 40 years Imperial Beach Gardens — 1,281 4,820 4,894 1,281 9,714 (8,054 ) 1959/2008 7/31/1985 30 years Loma Palisades — 14,000 16,570 25,982 14,051 42,501 (27,988 ) 1958/2001-2008 7/20/1990 30 years Mariner’s Point — 2,744 4,540 1,553 2,744 6,093 (3,430 ) 1986 5/9/2001 30 years Santa Fe Park RV Resort — 401 928 841 401 1,769 (1,483 ) 1971/2007-2008 6/1/1979 30 years Pacific Ridge Apartments — 47,971 178,497 1,094 47,971 179,591 (11,329 ) 2013 4/28/2017 30 years Hassalo on Eighth - Multifamily — — — 177,859 6,220 171,639 (19,649 ) 2015 7/1/2011 30 years Waikiki Beach Walk: Retail — 45,995 74,943 430 45,995 75,373 (18,753 ) 2006 1/19/2011 35 years Hotel — 30,640 60,029 2,404 30,640 62,433 (19,184 ) 2008/2014 1/19/2011 35 years Solana Beach - Highway 101 Land — 7,847 202 796 8,845 — (189 ) N/A 9/20/2011 N/A Encumbrance as of December 31, 2018 Initial Cost Cost Capitalized Subsequent to Acquisition Gross Carrying Amount at December 31, 2018 Accumulated Depreciation and Amortization Year Built/ Renovated Date Acquired Life on which depreciation in latest income statements is computed Description Land Building and Improvements Land Building and Improvements $ 182,765 $ 518,672 $ 1,391,485 $ 720,034 $ 555,630 $ 2,074,561 $ (590,338 ) (1) For Federal tax purposes, the aggregate tax basis is approximately $1.9 billion as of December 31, 2018 . Year Ended December 31, 2018 2017 2016 Real estate assets Balance, beginning of period $ 2,614,138 2,301,006 2,246,028 Additions: Property acquisitions — 270,602 — Improvements 62,790 44,755 59,199 Deductions: Cost of Real Estate Sold — — — Other (1) (46,737 ) (2,225 ) (4,221 ) Balance, end of period $ 2,630,191 $ 2,614,138 $ 2,301,006 Accumulated depreciation Balance, beginning of period $ 537,431 $ 469,460 $ 411,166 Additions—depreciation 99,644 70,196 62,515 Deductions: Cost of Real Estate Sold — — — Other (1) (46,737 ) (2,225 ) (4,221 ) Balance, end of period $ 590,338 $ 537,431 $ 469,460 (1) Other deductions for the years ended December 31, 2018 , 2017 and 2016 represent the write-off of fully depreciated assets.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Business and Organization	Business and Organization American Assets Trust, Inc. (which may be referred to in these financial statements as the “company,” “we,” “us,” or “our”) is a Maryland corporation formed on July 16, 2010 that did not have any operating activity until the consummation of our initial public offering (the “Offering”) and the related acquisition on January 19, 2011 of certain assets of a combination of entities whose assets included entities owned and/or controlled by Ernest S. Rady and his affiliates, including the Rady Trust, which in turn owned (1) controlling interests in entities owning 17 properties and the property management business of American Assets, Inc. and (2) noncontrolling interests in entities owning four properties. The company is the sole general partner of American Assets Trust, L.P., a Maryland limited partnership formed on July 16, 2010 (the “Operating Partnership”). The company's operations are carried on through our Operating Partnership and its subsidiaries, including our taxable REIT subsidiary. Since the formation of our Operating Partnership, the company has controlled our Operating Partnership as its general partner and has consolidated its assets, liabilities and results of operations. We are a vertically integrated and self-administered REIT with 189 employees providing substantial in-house expertise in asset management, property management, property development, leasing, tenant improvement construction, acquisitions, repositioning, redevelopment and financing. Any reference to the number of properties or units, square footage or acres, employees; or references to beneficial ownership interests, are unaudited and outside the scope of our independent registered public accounting firm's audit of our financial statements in accordance with the standards of the United States Public Company Accounting Oversight Board. As of December 31, 2018 , we owned or had a controlling interest in 27 office, retail, multifamily and mixed-use operating properties, the operations of which we consolidate. Additionally, as of December 31, 2018 , we owned land at three of our properties that we classify as held for development and construction in progress. A summary of the properties owned by us is as follows: Retail Carmel Country Plaza Gateway Marketplace Alamo Quarry Market Carmel Mountain Plaza Del Monte Center Hassalo on Eighth - Retail South Bay Marketplace Geary Marketplace Lomas Santa Fe Plaza The Shops at Kalakaua Solana Beach Towne Centre Waikele Center Office Torrey Reserve Campus First & Main Torrey Point Lloyd District Portfolio Solana Beach Corporate Centre City Center Bellevue The Landmark at One Market One Beach Street Multifamily Loma Palisades Hassalo on Eighth - Multifamily Imperial Beach Gardens Mariner's Point Santa Fe Park RV Resort Pacific Ridge Apartments Mixed-Use Waikiki Beach Walk Retail and Embassy Suites™ Hotel Held for Development and Construction in Progress Solana Beach Corporate Centre – Land Solana Beach – Highway 101 – Land Lloyd District Portfolio – Construction in Progress
Basis of Presentation	Basis of Presentation Our consolidated financial statements include the accounts of the company, our Operating Partnership and our subsidiaries. The equity interests of other investors in our Operating Partnership are reflected as noncontrolling interests. All significant intercompany transactions and balances are eliminated in consolidation.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America, referred to as “GAAP,” requires management to make estimates and assumptions that in certain circumstances affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities, and revenues and expenses. These estimates are prepared using management's best judgment, after considering past, current and expected events and economic conditions. Actual results could differ from these estimates.
Consolidated Statements of Cash Flows-Supplemental Disclosures	Consolidated Statements of Cash Flows-Supplemental Disclosures The following table provides supplemental disclosures related to the Consolidated Statements of Cash Flows (in thousands): Year Ended December 31, 2018 2017 2016 Supplemental cash flow information Total interest costs incurred $ 53,736 $ 55,418 $ 53,487 Interest capitalized $ 1,488 $ 1,570 $ 1,551 Interest expense $ 52,248 $ 53,848 $ 51,936 Cash paid for interest, net of amounts capitalized $ 52,632 $ 47,473 $ 47,793 Cash paid for income taxes $ 462 $ 461 $ 641 Supplemental schedule of noncash investing and financing activities Increase (decrease) in accounts payable and accrued liabilities for construction in progress $ 8,379 $ (2,746 ) $ (435 ) Increase (decrease) in accrued leasing commissions $ 3,534 $ 726 $ (355 ) Reduction to capital for prepaid equity financing costs $ 241 $ — $ —
Revenue Recognition and Accounts Receivable	Revenue Recognition and Accounts Receivable Our leases with tenants are classified as operating leases. Substantially all such leases contain fixed rent escalations which occur at specified times during the term of the lease. Base rents are recognized on a straight-line basis from when the tenant controls the space through the term of the related lease, net of valuation adjustments, based on management's assessment of credit, collection and other business risks. When we determine that we are the owner of tenant improvements and the tenant has reimbursed us for a portion or all of the tenant improvement costs, we consider the amount paid to be additional rent, which is recognized on a straight-line basis over the term of the related lease. For first generation tenants, in instances in which we fund tenant improvements and the improvements are deemed to be owned by us, revenue recognition will commence when the improvements are substantially completed and possession or control of the space is turned over to the tenant. When we determine that the tenant is the owner of tenant improvements, tenant allowances are recorded as lease incentives and we commence revenue recognition and lease incentive amortization when possession or control of the space is turned over to the tenant for tenant work to begin. Percentage rents, which represent additional rents based upon the level of sales achieved by certain tenants, are recognized at the end of the lease year or earlier if we have determined the required sales level is achieved and the percentage rents are collectible. Real estate tax and other cost reimbursements are recognized on an accrual basis over the periods in which the related expenditures are incurred. Other property income includes parking income, general excise tax billed to tenants and fees charged to tenants at our multifamily properties. Other property income is recognized when we satisfy performance obligations as evidenced by the transfer of control of our services to customers. We measure other property income based on the amount of consideration we expect to be entitled to in exchange for the services provided. We recognize general excise tax gross, with the amounts billed to tenants and customers recorded in other property income and the related taxes paid as rental expense. The general excise tax included in other income was $3.6 million , $3.7 million and $3.8 million for the years ended December 31, 2018 , 2017 and 2016 , respectively. For a tenant to terminate its lease agreement prior to the end of the agreed term, we may require that they pay a fee to cancel the lease agreement. Lease termination fees for which the tenant has relinquished control of the space are generally recognized on the later of the termination date or the satisfaction of all conditions precedent to the lease termination, including, without limitation, payment of all lease termination fees. When a lease is terminated early but the tenant continues to control the space under a modified lease agreement, the lease termination fee is generally recognized evenly over the remaining term of the modified lease agreement. We recognize revenue on the hotel portion of our mixed-use property from the rental of hotel rooms and guest services when we satisfy performance obligations as evidenced by the transfer of control when the rooms are occupied and services have been provided. Food and beverage sales are recognized when the customer has been served or at the time the transaction occurs. Revenue from room rental is included in rental revenue on the statement of income. Revenue from other sales and services provided is included in other property income on the statement of income. We make estimates of the collectability of our accounts receivable related to minimum rents, straight-line rents, expense reimbursements and other revenue. Accounts receivable and deferred rent receivable are carried net of this allowance for doubtful accounts. We generally do not require collateral or other security from our tenants, other than letters of credit or security deposits. Our determination as to the collectability of accounts receivable and correspondingly, the adequacy of this allowance, is based primarily upon evaluations of individual receivables, current economic conditions, historical experience and other relevant factors. The allowance for doubtful accounts is increased or decreased through bad debt expense. In some cases, primarily relating to straight-line rents, the collection of these amounts extends beyond one year. Our experience relative to unbilled straight-line rents is that a portion of the amounts otherwise recognizable as revenue is never billed to or collected from tenants due to early lease terminations, lease modifications, bankruptcies and other factors. Accordingly, the extended collection period for straight-line rents along with our evaluation of tenant credit risk may result in the nonrecognition of a portion of straight-line rental income until the collection of such income is reasonably assured. If our evaluation of tenant credit risk changes indicating more straight-line revenue is reasonably collectible than previously estimated and realized, the additional straight-line rental income is recognized as revenue. If our evaluation of tenant credit risk changes indicating a portion of realized straight-line rental income is no longer collectible, a reserve and bad debt expense is recorded. At December 31, 2018 and December 31, 2017 , our allowance for doubtful accounts was $0.6 million and $0.4 million , respectively. Our allowance for deferred rent receivables at December 31, 2018 and December 31, 2017 was $0.3 million and $1.4 million , respectively. Total bad debt expense was $0.8 million , $0.8 million and $0.8 million for the years ended December 31, 2018 , 2017 and 2016 , respectively. We recognize gains on sales of properties upon the closing of the transaction with the purchaser. Gains on properties sold are recognized when we satisfy performance obligations as evidenced when (1) the collectability of the sales price is reasonably assured, (2) we are not obligated to perform significant activities after the sale, (3) the initial investment from the buyer is sufficient and (4) other profit recognition criteria have been satisfied. Gains on sales of properties may be deferred until the requirements for gain recognition have been met.
Real Estate	Real Estate Land, buildings and improvements are recorded at cost. Depreciation is computed using the straight-line method. Estimated useful lives range generally from 30 years to a maximum of 40 years on buildings and major improvements. Minor improvements, furniture and equipment are capitalized and depreciated over useful lives ranging from 3 years to 15 years . Maintenance and repairs that do not improve or extend the useful lives of the related assets are charged to operations as incurred. Tenant improvements are capitalized and depreciated over the life of the related lease or their estimated useful life, whichever is shorter. If a tenant vacates its space prior to the contractual termination of its lease, the undepreciated balance of any tenant improvements are written off if they are replaced or have no future value. For the years ended December 31, 2018 , 2017 and 2016 , real estate depreciation expense was $99.6 million , $70.2 million and $62.5 million , respectively. Acquisitions of properties are accounted for in accordance with the authoritative accounting guidance on acquisitions and business combinations. Our methodology of allocating the cost of acquisitions to assets acquired and liabilities assumed is based on estimated fair values, replacement cost and appraised values. When we acquire operating real estate properties, the purchase price is allocated to land and buildings, intangibles such as in-place leases, and to current assets and liabilities acquired, if any. Such valuations include a consideration of the noncancelable terms of the respective leases as well as any applicable renewal periods. The fair values associated with below market renewal options are determined based on a review of several qualitative and quantitative factors on a lease-by-lease basis at acquisition to determine whether it is probable that the tenant would exercise its option to renew the lease agreement. These factors include: (1) the type of tenant in relation to the property it occupies, (2) the quality of the tenant, including the tenant's long term business prospects and (3) whether the fixed rate renewal option was sufficiently lower than the fair rental of the property at the date the option becomes exercisable such that it would appear to be reasonably assured that the tenant would exercise the option to renew. The value allocated to in-place leases is amortized over the related lease term and reflected as depreciation and amortization in the statement of income. The value of above and below market leases associated with the original noncancelable lease terms are amortized to rental income over the terms of the respective noncancelable lease periods and are reflected as either an increase (for below market leases) or a decrease (for above market leases) to rental income in the statement of income. The value of the leases associated with below market lease renewal options that are likely to be exercised are amortized to rental income over the respective renewal periods. If a tenant vacates its space prior to contractual termination of its lease or the lease is not renewed, the unamortized balance of any in-place lease value is written off to rental income and amortization expense.
Capitalized Costs	Capitalized Costs We capitalize certain costs related to the development and redevelopment of real estate including pre-construction costs, real estate taxes, insurance and construction costs and salaries and related costs of personnel directly involved. Additionally, we capitalize interest costs related to development and significant redevelopment activities. Capitalization of these costs begins when the activities and related expenditures commence and cease when the project is substantially complete and ready for its intended use, at which time the project is placed in service and depreciation commences. Additionally, we make estimates as to the probability of certain development and redevelopment projects being completed. If we determine that the completion of development or redevelopment is no longer probable, we expense all capitalized costs which are not recoverable.
Impairment of Long Lived Assets	Impairment of Long Lived Assets We review for impairment on a property by property basis whenever events or changes in circumstances indicate that the carrying value of a property may not be fully recoverable. Impairment is recognized on properties held for use when the expected undiscounted cash flows for a property are less than its carrying amount at which time the property is written-down to fair value. Properties held for sale are recorded at the lower of the carrying amount or the expected sales price less costs to sell.
Financial Instruments	Financial Instruments The estimated fair values of financial instruments are determined using available market information and appropriate valuation methods. Considerable judgment is necessary to interpret market data and develop estimated fair values. The use of different market assumptions or estimation methods may have a material effect on the estimated fair value amounts. Accordingly, estimated fair values are not necessarily indicative of the amounts that could be realized in current market exchanges.
Derivative Instruments	Derivative Instruments At times, we may use derivative instruments to manage exposure to variable interest rate risk. We may enter into interest rate swaps to manage our exposure to variable interest rate risk. If and when we enter into derivative instruments, we ensure that such instruments qualify as cash flow hedges and would not enter into derivative instruments for speculative purposes. Any interest rate swaps associated with our cash flow hedges are recorded at fair value on a recurring basis. We assess effectiveness of our cash flow hedges both at inception and on an ongoing basis. The effective portion of changes in fair value of the interest rate swaps associated with our cash flow hedges is recorded in accumulated other comprehensive income (loss) and is subsequently reclassified into interest expense as interest is incurred on the related variable rate debt. Our cash flow hedges become ineffective if critical terms of the hedging instrument and the debt instrument do not perfectly match such as notional amounts, settlement dates, reset dates, calculation period and LIBOR rate. In addition, we evaluate the default risk of the counterparty by monitoring the credit worthiness of the counterparty. When ineffectiveness exists, the ineffective portion of changes in fair value of the interest rate swaps associated with our cash flow hedges is recognized in earnings in the period affected.
Cash and Cash Equivalents	Cash and Cash Equivalents We define cash and cash equivalents as cash on hand, demand deposits with financial institutions and short term liquid investments with an initial maturity of less than 3 months . Cash balances in individual banks may exceed the federally insured limit of $250,000 by the Federal Deposit Insurance Corporation (the "FDIC"). No losses have been experienced related to such accounts.
Restricted Cash	Restricted Cash Restricted cash consists of amounts held by lenders to provide for future real estate tax expenditures, insurance expenditures and reserves for capital improvements.
Other Assets	Other Assets Other assets consist primarily of lease costs, lease incentives, acquired in-place leases and acquired above market leases. Capitalized lease costs are direct costs incurred which were essential to originate a lease and would not have been incurred had the leasing transaction not taken place and include third party commissions related to obtaining a lease. Capitalized lease costs are amortized over the life of the related lease and included in depreciation and amortization expense on the statement of income. If a tenant vacates its space prior to the contractual termination of its lease, the unamortized balance of any lease costs are written off. We view these lease costs as part of the up-front initial investment we made in order to generate a long-term cash inflow. Therefore, we classify cash outflows for lease costs as an investing activity in our consolidated statements of cash flows.
Variable Interest Entities	Variable Interest Entities Certain entities that do not have sufficient equity at risk for the entity to finance its activities without additional subordinated financial support from other parties or in which equity investors do not have the characteristics of a controlling financial interest qualify as variable interest entities (“VIEs”). VIEs are required to be consolidated by their primary beneficiary. The primary beneficiary of a VIE is the party that has a controlling interest in the VIE. Identifying the party with the controlling interest requires a focus on which entity has the power to direct the activities of the VIE that most significantly impact the VIE's economic performance and (1) the obligation to absorb the expected losses of the VIE or (2) the right to receive the benefits from the VIE.
Stock-Based Compensation	Stock-Based Compensation We grant stock-based compensation awards to our employees and directors typically in the form of restricted shares of common stock, options to purchase common stock and/or shares of common stock. We measure stock-based compensation expense based on the fair value of the award on the grant date and recognize the expense ratably over the vesting period.
Deferred Compensation	Deferred Compensation Our Operating Partnership has adopted the American Assets Trust Executive Deferral Plan V (“EDP V”) and the American Assets Trust Executive Deferral Plan VI (“EDP VI”). These plans were adopted by our Operating Partnership as successor plans to those deferred compensation plans maintained by American Assets Inc. ("AAI") in which certain employees of AAI, who were transferred to us in connection with the Offering (the “Transferred Participants”), participated prior to the Offering. EDP V and EDP VI contain substantially the same terms and conditions as these predecessor plans. AAI transferred to our Operating Partnership the Transferred Participants' account balances under the predecessor plans. These transferred account balances represent amounts deferred by the Transferred Participants prior to the Offering while they were employed by AAI. At the time eligible participants defer compensation, we record compensation cost and a corresponding deferred compensation plan liability, which is included in other liabilities and deferred credits on our consolidated balance sheets. This liability is adjusted to fair value at the end of each accounting period based on the performance of the benchmark funds selected by each participant, and the impact of adjusting the liability to fair value is recorded as an increase or decrease to compensation cost.
Income Taxes	Income Taxes We elected to be taxed as a REIT under the Internal Revenue Code of 1986, as amended (the “Code”) commencing with the taxable year ending December 31, 2011. To maintain our qualification as a REIT, we are required to distribute at least 90% of our REIT taxable income to our stockholders and meet the various other requirements imposed by the Code relating to such matters as operating results, asset holdings, distribution levels and diversity of stock ownership. Provided we maintain our qualification for taxation as a REIT, we are generally not subject to corporate level income tax on the earnings distributed currently to our stockholders that we derive from our REIT qualifying activities. If we fail to maintain our qualification as a REIT in any taxable year, and are unable to avail ourselves of certain savings provisions set forth in the Code, all of our taxable income would be subject to regular U.S. federal income tax. We are subject to certain state and local income taxes. We, together with one of our subsidiaries, have elected to treat such subsidiary as a taxable REIT subsidiary (a “TRS”) for federal income tax purposes. Certain activities that we undertake must be conducted by a TRS, such as non-customary services for our tenants, and holding assets that we cannot hold directly. A TRS is subject to federal and state income taxes.
Segment Information	Segment Information Segment information is prepared on the same basis that our management reviews information for operational decision-making purposes. We operate in four reportable segments: the acquisition, redevelopment, ownership and management of retail real estate, office real estate, multifamily real estate and mixed-use real estate. The products for our retail segment primarily include rental of retail space and other tenant services, including tenant reimbursements, parking and storage space rental. The products for our office segment primarily include rental of office space and other tenant services, including tenant reimbursements, parking and storage space rental. The products for our multifamily segment include rental of apartments and other tenant services. The products of our mixed-use segment include rental of retail space and other tenant services, including tenant reimbursements, parking and storage space rental and operation of a 369 -room all-suite hotel.
Recent Accounting Pronouncements	Recent Accounting Pronouncements In August 2017, the FASB issued Accounting Standards Update (“ASU”) 2017-12, Derivatives and Hedging: Targeted Improvements to Accounting for Hedging Activities . The pronouncement was issued to simplify the on-going assessment of hedge effectiveness and increase transparency related to hedge accounting. The pronouncement is effective for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2018, with early adoption permitted. The company early adopted the provisions of ASU No. 2017-12 effective October 1, 2017 using the modified retrospective approach. The company determined there is no impact to the company’s historical results as a result of adoption of the new standard and therefore no adjustment to retained earnings from application of the ASU. In January 2017, the FASB issued ASU 2017-1, Business Combinations: Clarifying the Definition of a Business . The pronouncement changes the definition of a business to assist entities with evaluating when a set of transferred assets and activities is a business. The pronouncement requires an entity to evaluate if substantially all of the fair value of the gross assets acquired is concentrated in a single identifiable asset or a group of similar identifiable assets; if so, the set of transferred assets and activities is not a business. The pronouncement is effective for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2018, with early adoption permitted. The company early adopted this ASU effective January 1, 2017. For the period from January 1, 2017 through December 31, 2017, the company acquired three properties for which we concluded that substantially all of the fair value of the assets acquired were concentrated in a single identifiable asset and that the assets therefore did not meet the definition of a business under ASU 2017-01. Acquisition transaction costs associated with these property acquisitions were approximately $0.2 million and were capitalized to real estate investments. In November 2016, the FASB issued ASU 2016-18, Restricted Cash . This pronouncement requires companies to include restricted cash and restricted cash equivalents with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. The pronouncement also requires a disclosure of a reconciliation between the statement of financial position and the statement of cash flows when the balance sheet includes more than one line item for cash, cash equivalents, restricted cash, and restricted cash equivalents. Entities with material restricted cash and restricted cash equivalents balances will be required to disclose the nature of the restrictions. The ASU is effective for reporting periods beginning after December 15, 2017, with early adoption permitted, and will be applied retrospectively to all periods presented. The company adopted this ASU effective December 31, 2017. The adoption of this ASU impacted the presentation of cash flows with inclusion of restricted cash flows for each of the presented periods. As of December 31, 2018 and 2017, we had $9.3 million and $9.3 million of restricted cash, respectively, on our consolidated balance sheets. In March 2016, the FASB issued ASU 2016-09, Improvements to Employee Share-Based Payment Accounting , which simplifies several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. ASU 2016-09 is effective for fiscal years beginning after December 15, 2016, and interim periods within those fiscal years. The company adopted this ASU effective January 1, 2017 and the adoption did not have a material impact on our consolidated financial statements. In February 2016, the FASB issued ASU No. 2016-2, Leases (Topic 842), which provides the principles for the recognition, measurement, presentation and disclosure of leases. This ASU significantly changes the accounting for leases by requiring lessees to recognize assets and liabilities for leases greater than 12 months on their balance sheet. The lessor model stays substantially the same; however, there were modifications to conform lessor accounting with the lessee model, eliminate real estate specific guidance, further define certain lease and non-lease components, and change the definition of initial direct costs of leases requiring significantly more leasing related costs to be expensed upfront. The pronouncement is effective for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2018. We will adopt ASU No. 2016-2 in the first quarter of 2019 using the modified retrospective approach. In July 2018, the FASB issued ASU 2018-11, Leases (Topic 842): Targeted Improvements , which allows lessors to elect a practical expedient by class of underlying assets to not separate non-lease components from the lease component if certain conditions are met. The lessor’s practical expedient election would be limited to circumstances in which the non-lease components otherwise would be accounted for under the new revenue guidance and both (i) the timing and pattern of transfer are the same for the nonlease component and the related lease component and (ii) the lease component would be classified as an operating lease. The company will elect the practical expedient which would allow the company the ability to combine the lease and non-lease components if the underlying asset meets the criteria above. ASU 2018-11 also includes an optional transition method in addition to the existing requirements for transition to the new standard by recognizing a cumulative effect adjustment to the opening balance sheet of retained earnings in the period of adoption. Consequently, a company’s reporting for the comparative periods presented in the financial statements would continue to be in accordance with current GAAP (Topic 840). The company will elect this practical expedient as well. While we continue to evaluate the impact this pronouncement will have on our consolidated financial statements, we expect that the real estate leases designated as operating leases in Note 12 - Commitments and Contingencies, will be recognized as right-of-use assets and corresponding lease liabilities on our consolidated balance sheets upon adoption. As of December 31, 2018, the remaining contractual payments under lease agreements for which the company is the lessee aggregated approximately $8.9 million . The company estimates the adoption of this standard will result in a right-of-use asset and lease liability of between $5.0 million and $10.0 million . In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers . The pronouncement was issued to clarify the principles for recognizing revenue and to develop a common revenue standard and disclosure requirements for U.S. GAAP and International Financial Reporting Standards. The pronouncement is effective for reporting periods beginning after December 15, 2017. We adopted the provisions of the ASU effective January 1, 2018 using the modified retrospective approach. As discussed above, lease are specifically excluded from this and will be governed by the applicable lease codification. We evaluated the revenue recognition for all contracts within this scope under existing accounting standards and under the new revenue recognition ASU and confirmed that there were no differences in the amounts recognized or the pattern of recognition. This evaluation included revenues from the hotel portion of our mixed-use property, parking income and excise taxes charged to customers. Therefore, the adoption of this ASU did not result in an adjustment to the company’s retained earnings on January 1, 2018.
Fair Value Measurements	FAIR VALUE OF FINANCIAL INSTRUMENTS A fair value measurement is based on the assumptions that market participants would use in pricing an asset or liability. The hierarchy for inputs used in measuring fair value is as follows: 1. Level 1 Inputs—quoted prices in active markets for identical assets or liabilities 2. Level 2 Inputs—observable inputs other than quoted prices in active markets for identical assets and liabilities 3. Level 3 Inputs—unobservable inputs In certain cases, the inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, for disclosure purposes, the level within which the fair value measurement is categorized is based on the lowest level input that is significant to the fair value measurement.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Summary of Properties Owned	A summary of the properties owned by us is as follows: Retail Carmel Country Plaza Gateway Marketplace Alamo Quarry Market Carmel Mountain Plaza Del Monte Center Hassalo on Eighth - Retail South Bay Marketplace Geary Marketplace Lomas Santa Fe Plaza The Shops at Kalakaua Solana Beach Towne Centre Waikele Center Office Torrey Reserve Campus First & Main Torrey Point Lloyd District Portfolio Solana Beach Corporate Centre City Center Bellevue The Landmark at One Market One Beach Street Multifamily Loma Palisades Hassalo on Eighth - Multifamily Imperial Beach Gardens Mariner's Point Santa Fe Park RV Resort Pacific Ridge Apartments Mixed-Use Waikiki Beach Walk Retail and Embassy Suites™ Hotel Held for Development and Construction in Progress Solana Beach Corporate Centre – Land Solana Beach – Highway 101 – Land Lloyd District Portfolio – Construction in Progress A summary of our real estate investments is as follows (in thousands): Retail Office Multifamily Mixed-Use Total December 31, 2018 Land $ 262,860 $ 143,467 $ 72,668 $ 76,635 $ 555,630 Buildings 516,566 743,474 389,831 125,859 1,775,730 Land improvements 43,412 8,825 6,778 2,606 61,621 Tenant improvements 70,210 91,612 — 1,918 163,740 Furniture, fixtures, and equipment 570 2,671 13,844 6,826 23,911 Construction in progress 8,598 39,511 854 596 49,559 (1) 902,216 1,029,560 483,975 214,440 2,630,191 Accumulated depreciation (273,482 ) (206,986 ) (71,933 ) (37,937 ) (590,338 ) Net real estate $ 628,734 $ 822,574 $ 412,042 $ 176,503 $ 2,039,853 December 31, 2017 Land $ 262,860 $ 143,575 $ 72,668 $ 76,635 $ 555,738 Buildings 548,062 705,999 383,210 125,859 1,763,130 Land improvements 42,401 9,313 6,758 2,606 61,078 Tenant improvements 67,879 80,968 — 1,955 150,802 Furniture, fixtures, and equipment 372 2,085 12,377 6,429 21,263 Construction in progress 3,086 52,512 6,505 24 62,127 (1) 924,660 994,452 481,518 213,508 2,614,138 Accumulated depreciation (266,006 ) (181,331 ) (57,474 ) (32,620 ) (537,431 ) Net real estate $ 658,654 $ 813,121 $ 424,044 $ 180,888 $ 2,076,707 (1) Land related to held for development and construction in progress is included in the Held for Development and Construction in Progress classifications on the consolidated balance sheets.
Consolidated Statements of Cash Flows-Supplemental Disclosures	The following table provides supplemental disclosures related to the Consolidated Statements of Cash Flows (in thousands): Year Ended December 31, 2018 2017 2016 Supplemental cash flow information Total interest costs incurred $ 53,736 $ 55,418 $ 53,487 Interest capitalized $ 1,488 $ 1,570 $ 1,551 Interest expense $ 52,248 $ 53,848 $ 51,936 Cash paid for interest, net of amounts capitalized $ 52,632 $ 47,473 $ 47,793 Cash paid for income taxes $ 462 $ 461 $ 641 Supplemental schedule of noncash investing and financing activities Increase (decrease) in accounts payable and accrued liabilities for construction in progress $ 8,379 $ (2,746 ) $ (435 ) Increase (decrease) in accrued leasing commissions $ 3,534 $ 726 $ (355 ) Reduction to capital for prepaid equity financing costs $ 241 $ — $ —

Real Estate (Tables)

Real Estate (Tables)	12 Months Ended
	Dec. 31, 2018
Real Estate [Line Items]
Summary of Real Estate Investments	A summary of the properties owned by us is as follows: Retail Carmel Country Plaza Gateway Marketplace Alamo Quarry Market Carmel Mountain Plaza Del Monte Center Hassalo on Eighth - Retail South Bay Marketplace Geary Marketplace Lomas Santa Fe Plaza The Shops at Kalakaua Solana Beach Towne Centre Waikele Center Office Torrey Reserve Campus First & Main Torrey Point Lloyd District Portfolio Solana Beach Corporate Centre City Center Bellevue The Landmark at One Market One Beach Street Multifamily Loma Palisades Hassalo on Eighth - Multifamily Imperial Beach Gardens Mariner's Point Santa Fe Park RV Resort Pacific Ridge Apartments Mixed-Use Waikiki Beach Walk Retail and Embassy Suites™ Hotel Held for Development and Construction in Progress Solana Beach Corporate Centre – Land Solana Beach – Highway 101 – Land Lloyd District Portfolio – Construction in Progress A summary of our real estate investments is as follows (in thousands): Retail Office Multifamily Mixed-Use Total December 31, 2018 Land $ 262,860 $ 143,467 $ 72,668 $ 76,635 $ 555,630 Buildings 516,566 743,474 389,831 125,859 1,775,730 Land improvements 43,412 8,825 6,778 2,606 61,621 Tenant improvements 70,210 91,612 — 1,918 163,740 Furniture, fixtures, and equipment 570 2,671 13,844 6,826 23,911 Construction in progress 8,598 39,511 854 596 49,559 (1) 902,216 1,029,560 483,975 214,440 2,630,191 Accumulated depreciation (273,482 ) (206,986 ) (71,933 ) (37,937 ) (590,338 ) Net real estate $ 628,734 $ 822,574 $ 412,042 $ 176,503 $ 2,039,853 December 31, 2017 Land $ 262,860 $ 143,575 $ 72,668 $ 76,635 $ 555,738 Buildings 548,062 705,999 383,210 125,859 1,763,130 Land improvements 42,401 9,313 6,758 2,606 61,078 Tenant improvements 67,879 80,968 — 1,955 150,802 Furniture, fixtures, and equipment 372 2,085 12,377 6,429 21,263 Construction in progress 3,086 52,512 6,505 24 62,127 (1) 924,660 994,452 481,518 213,508 2,614,138 Accumulated depreciation (266,006 ) (181,331 ) (57,474 ) (32,620 ) (537,431 ) Net real estate $ 658,654 $ 813,121 $ 424,044 $ 180,888 $ 2,076,707 (1) Land related to held for development and construction in progress is included in the Held for Development and Construction in Progress classifications on the consolidated balance sheets.
Schedule of Purchase Price Allocations	The financial information set forth below summarizes the company’s purchase price allocations for the Pacific Ridge Apartments and Gateway Marketplace during the year ended December 31, 2017 (in thousands): Pacific Ridge Apartments Gateway Marketplace Land $ 47,971 $ 17,363 Building 171,813 19,192 Land improvements 3,403 1,522 Furniture, fixtures, and equipment 3,281 930 Total real estate 226,468 39,007 Lease intangibles 5,592 2,920 Prepaid expenses and other assets 424 — Assets acquired $ 232,484 $ 41,927 Accounts payable and accrued expenses $ 74 $ 203 Security deposits payable 673 22 Other liabilities and deferred credits 49 1,034 Liabilities assumed $ 796 $ 1,259
Schedule of Operating Results	The following table summarizes the operating results for the Pacific Ridge Apartments and Gateway Marketplace included in the company’s historical consolidated statement of operations for the period of acquisition through December 31, 2017 (in thousands): Pacific Ridge Apartments Gateway Marketplace Total Revenues $ 10,983 $ 1,667 $ 12,650 Operating expenses $ 15,238 $ 1,082 $ 16,320 Operating (loss) income $ (4,255 ) $ 585 $ (3,670 ) Net (loss) income attributable to American Assets Trust, Inc. $ (4,255 ) $ 585 $ (3,670 )
Schedule of Pro Forma Financial Information	The pro forma financial information set forth below is presented for informational purposes only and may not be indicative of what actual results of operations would have been had the transactions occurred at the beginning of 2016, nor does it purport to represent the results of future operations (in thousands). Year Ended December 31, 2017 Year Ended December 31, 2016 As Reported ProForma As Reported ProForma Total revenue $ 314,983 $ 322,050 $ 295,088 $ 312,414 Total operating expenses $ 221,337 $ 230,796 $ 197,147 $ 215,631 Operating income $ 93,646 $ 91,255 $ 97,941 $ 96,783 Net income $ 40,132 $ 36,433 $ 45,637 $ 41,916

Acquired In-Place Leases and _2

Acquired In-Place Leases and Above/Below Market Leases (Tables)	12 Months Ended
	Dec. 31, 2018
Leases [Abstract]
Schedule of acquired lease intangibles included in other assets and other liabilities	Increases (decreases) in net income as a result of amortization of our in-place leases, above market leases and below market leases are as follows (in thousands): Year Ended December 31, 2018 2017 2016 Amortization of in-place leases $ (2,090 ) $ (8,769 ) $ (4,029 ) Amortization of above market leases (660 ) (934 ) (1,248 ) Amortization of below market leases 4,230 4,239 4,719 Net income (loss) $ 1,480 $ (5,464 ) $ (558 ) The following summarizes our acquired lease intangibles, which are included in other assets and other liabilities and deferred credits (in thousands): December 31, 2018 December 31, 2017 In-place leases $ 40,884 $ 54,206 Accumulated amortization (34,603 ) (45,835 ) Above market leases 11,963 21,262 Accumulated amortization (11,445 ) (20,084 ) Acquired lease intangible assets, net $ 6,799 $ 9,549 Below market leases $ 63,172 $ 67,423 Accumulated accretion (37,220 ) (37,241 ) Acquired lease intangible liabilities, net $ 25,952 $ 30,182
Future Amortization for Acquired In-Place Leases	As of December 31, 2018 , the amortization for acquired leases during the next five years and thereafter, assuming no early lease terminations, is as follows (in thousands): In-Place Leases Above Market Leases Below Market Leases Year Ending December 31, 2019 $ 1,620 $ 339 $ 3,478 2020 1,053 58 2,647 2021 719 28 2,414 2022 632 28 2,242 2023 539 27 2,073 Thereafter 1,718 38 13,098 $ 6,281 $ 518 $ 25,952

Fair Value of Financial Instr_2

Fair Value of Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Financial liabilities measured at fair value on recurring basis	A summary of our financial liabilities that are measured at fair value on a recurring basis by level within the fair value hierarchy is as follows (in thousands): December 31, 2018 December 31, 2017 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Deferred compensation liability $ — $ 1,424 $ — $ 1,424 $ — $ 1,156 $ — $ 1,156 Interest rate swap asset $ — $ 6,002 $ — $ 6,002 $ — $ 5,091 $ — $ 5,091 Interest rate swap liability $ — $ 801 $ — $ 801 $ — $ 10 $ — $ 10
Carrying amount and fair value of financial instruments	A summary of the carrying amount and fair value of our financial instruments, all of which are based on Level 2 inputs, is as follows (in thousands): December 31, 2018 December 31, 2017 Carrying Value Fair Value Carrying Value Fair Value Secured notes payable $ 182,572 $ 183,253 $ 279,550 $ 286,156 Unsecured term loan $ 248,765 $ 250,000 $ 248,839 $ 250,000 Unsecured senior guaranteed notes $ 797,098 $ 790,267 $ 796,631 $ 802,699 Unsecured line of credit $ 62,337 $ 64,000 $ — $ —

Other Assets (Tables)

Other Assets (Tables)	12 Months Ended
	Dec. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Components of Prepaid Expenses and Other Assets	Other assets consist of the following (in thousands): December 31, 2018 December 31, 2017 Leasing commissions, net of accumulated amortization of $28,597 and $28,318, respectively $ 28,796 $ 20,633 Interest rate swap asset 6,002 5,091 Acquired above market leases, net 518 1,178 Acquired in-place leases, net 6,281 8,371 Lease incentives, net of accumulated amortization of $299 and $136, respectively 747 916 Other intangible assets, net of accumulated amortization of $981 and $1,115, respectively 2,994 227 Prepaid expenses, deposits and other 6,683 5,945 Total other assets $ 52,021 $ 42,361

Other Liabilities and Deferre_2

Other Liabilities and Deferred Credits (Tables)	12 Months Ended
	Dec. 31, 2018
Other Liabilities Disclosure [Abstract]
Other liabilities and deferred credits	Other liabilities and deferred credits consist of the following (in thousands): December 31, 2018 December 31, 2017 Acquired below market leases, net $ 25,952 $ 30,182 Prepaid rent and deferred revenue 11,634 8,429 Interest rate swap liability 801 10 Straight-line rent liability 7,393 4,428 Deferred rent expense and lease intangible 2,210 1,670 Deferred compensation 1,424 1,156 Deferred tax liability 93 123 Other liabilities 40 63 Total other liabilities and deferred credits, net $ 49,547 $ 46,061

Debt (Tables)

Debt (Tables)	12 Months Ended
	Dec. 31, 2018
Debt Disclosure [Abstract]
Summary of total secured notes payable outstanding	The following is a summary of the Operating Partnership's total secured notes payable outstanding as of December 31, 2018 and December 31, 2017 (in thousands): Description of Debt Principal Balance as of Stated Interest Rate Stated Maturity Date December 31, 2018 December 31, 2017 as of December 31, 2018 Loma Palisades (1)(2) — 73,744 6.09 % July 1, 2018 One Beach Street (1)(3) — 21,900 3.94 % April 1, 2019 Torrey Reserve—North Court (4) 19,620 20,023 7.22 % June 1, 2019 Torrey Reserve—VCI, VCII, VCIII (4) 6,635 6,764 6.36 % June 1, 2020 Solana Beach Corporate Centre I-II (4) 10,502 10,721 5.91 % June 1, 2020 Solana Beach Towne Centre (4) 35,008 35,737 5.91 % June 1, 2020 City Center Bellevue (1) 111,000 111,000 3.98 % November 1, 2022 182,765 279,889 Debt issuance costs, net of accumulated amortization of $671 and $1,191, respectively (193 ) (339 ) Total Secured Notes Payable $ 182,572 $ 279,550 (1) Interest only. (2) Loan repaid in full, without premium or penalty, on March 30, 2018. (3) Loan repaid in full, without premium or penalty, on November 30, 2018. (4) Principal payments based on a 30 -year amortization schedule.
Scheduled principal payments on notes payable	Scheduled principal payments on secured and unsecured notes payable as of December 31, 2018 are as follows (in thousands): 2019 $ 120,762 2020 51,003 2021 150,000 2022 111,000 2023 150,000 Thereafter 650,000 $ 1,232,765

Derivative and Hedging (Tables)

Derivative and Hedging (Tables)	12 Months Ended
	Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Interest Rate Derivatives	The following is a summary of the terms of the interest rate swap as of December 31, 2018 (dollars in thousands): Swap Counterparty Notional Amount Effective Date Maturity Date Fair Value Bank of America, N.A. $ 100,000 1/9/2014 1/9/2019 $ 18 U.S. Bank N.A. $ 100,000 3/1/2016 3/1/2023 $ 3,976 Wells Fargo Bank, N.A. $ 50,000 5/2/2016 3/1/2023 $ 2,008 Bank of America, N.A. $ 100,000 1/9/2019 1/9/2021 $ (801 )

Equity of American Assets Tru_2

Equity of American Assets Trust, Inc. (Tables)	12 Months Ended
	Dec. 31, 2018
Equity [Abstract]
Dividends declared and paid on shares of common stock and noncontrolling common units	The following table lists the dividends declared and paid on our shares of common stock and Noncontrolling Common Units for the years ended December 31, 2018 , 2017 and 2016 : Period Amount per Share/Unit Period Covered Dividend Paid Date First Quarter 2016 $ 0.25 January 1, 2016 to March 31, 2016 March 25, 2016 Second Quarter 2016 $ 0.25 April 1, 2016 to June 30, 2016 June 24, 2016 Third Quarter 2016 $ 0.25 July 1, 2016 to September 30, 2016 September 29, 2016 Fourth Quarter 2016 $ 0.26 October 1, 2016 to December 31, 2016 December 22, 2016 First Quarter 2017 $ 0.26 January 1, 2017 to March 31, 2017 March 30, 2017 Second Quarter 2017 $ 0.26 April 1, 2017 to June 30, 2017 June 29, 2017 Third Quarter 2017 $ 0.26 July 1, 2017 to September 30, 2017 September 28, 2017 Fourth Quarter 2017 $ 0.27 October 1, 2017 to December 31, 2017 December 21, 2017 First Quarter 2018 $ 0.27 January 1, 2018 to March 31, 2018 March 19, 2018 Second Quarter 2018 $ 0.27 April 1, 2018 to June 30, 2018 June 28, 2018 Third Quarter 2018 $ 0.27 July 1, 2018 to September 30, 2018 September 27, 2018 Fourth Quarter 2018 $ 0.28 October 1, 2018 to December 31, 2018 December 27, 2018
Summary of income tax status of dividends per share paid	A summary of the income tax status of dividends per share paid is as follows: Year Ended December 31, 2018 2017 2016 Per Share % Per Share % Per Share % Ordinary income $ 1.05 96.3 % $ 1.05 100.0 % $ 1.01 100.0 % Capital gain — — % — — % — — % Return of capital 0.04 3.7 % — — % — — % Total $ 1.09 100.0 % $ 1.05 100.0 % $ 1.01 100.0 %
Schedule of restricted common stock	The following shares of restricted common stock have been issued as of December 31, 2018 : Grant Fair Value at Grant Date Number June 14, 2016 (1) $40.81 4,900 December 1, 2016 (2) $28.24 - $35.71 143,210 June 13, 2017 (1) $40.99 4,880 December 15, 2017 (3) $27.27 145,218 June 12, 2018 (1) $37.58 5,320 December 6, 2018 (4) $25.68 - $28.18 199,790 (1) Restricted common stock issued to members of the company's non-employee directors. These awards of restricted stock will vest subject to the director's continued service on the Board of Directors on the earlier of (i) the one year anniversary of the date of grant or (ii) the date of the next annual meeting of our stockholders, if such non-employee director continues his or her service on the Board of Directors until the next annual meeting of stockholders, but not thereafter, pursuant to our independent director compensation policy. (2) Restricted common stock issued to certain of the company's senior management and other employees, which are subject to pre-defined market specific performance criteria based vesting. Up to one-third of the shares of restricted stock may vest based on performance calculations determined as of November 30, 2017, 2018 and 2019, subject to the employee's continued employment on those dates.
Activity of restricted stock awards	The following table summarizes the activity of non-vested restricted stock awards during the year ended December 31, 2018 : 2018 Units Weighted Average Grant Date Fair Value Balance at beginning of year 268,768 $ 29.89 Granted 205,110 27.25 Vested (52,810 ) 30.04 Forfeited (78,975 ) 29.70 Balance at end of year 342,093 $ 28.33
Computation of basic and diluted EPS	The computation of basic and diluted EPS for American Assets Trust, Inc. is presented below (dollars in thousands, except share and per share amounts): Year Ended December 31, 2018 2017 2016 NUMERATOR Net income from operations $ 27,202 $ 40,132 $ 45,637 Less: Net income attributable to restricted shares (311 ) (241 ) (189 ) Less: Income from operations attributable to unitholders in the Operating Partnership (7,205 ) (10,814 ) (12,863 ) Net income attributable to common stockholders—basic $ 19,686 $ 29,077 $ 32,585 Income from operations attributable to American Assets Trust, Inc. common stockholders—basic $ 19,686 $ 29,077 $ 32,585 Plus: Income from operations attributable to unitholders in the Operating Partnership 7,205 10,814 12,863 Net income attributable to common stockholders—diluted $ 26,891 $ 39,891 $ 45,448 DENOMINATOR Weighted average common shares outstanding—basic 46,950,812 46,715,520 45,332,471 Effect of dilutive securities—conversion of Operating Partnership units 17,185,747 17,371,730 17,895,688 Weighted average common shares outstanding—diluted 64,136,559 64,087,250 63,228,159 Earnings per common share, basic $ 0.42 $ 0.62 $ 0.72 Earnings per common share, diluted $ 0.42 $ 0.62 $ 0.72

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income tax provision	The income tax provision included in other income (expense) on the consolidated statement of income is as follows (in thousands): Year Ended December 31, 2018 Year Ended December 31, 2017 Year Ended December 31, 2016 Current: Federal $ 60 $ — $ 132 State 465 422 341 Deferred: Federal $ (6 ) $ — $ — State (192 ) (208 ) 93 Provision for income taxes $ 327 $ 214 $ 566

Commitments and Contingencies_2

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Current minimum annual payments under the leases	Current minimum annual payments under the leases are as follows, as of December 31, 2018 (in thousands): 2019 $ 3,347 2020 3,422 2021 2,153 2022 — 2023 — Thereafter — Total $ 8,922 As of December 31, 2018 , minimum future rentals from noncancelable operating leases before any reserve for uncollectible amounts and assuming no early lease terminations, at our office and retail properties and the retail portion of our mixed-use property are as follows for the years ended December 31 (in thousands): 2019 $ 177,144 2020 172,821 2021 157,611 2022 138,787 2023 116,985 Thereafter 412,934 Total $ 1,176,282

Operating Leases (Tables)

Operating Leases (Tables)	12 Months Ended
	Dec. 31, 2018
Leases, Operating [Abstract]
Current minimum future rentals under the leases	Current minimum annual payments under the leases are as follows, as of December 31, 2018 (in thousands): 2019 $ 3,347 2020 3,422 2021 2,153 2022 — 2023 — Thereafter — Total $ 8,922 As of December 31, 2018 , minimum future rentals from noncancelable operating leases before any reserve for uncollectible amounts and assuming no early lease terminations, at our office and retail properties and the retail portion of our mixed-use property are as follows for the years ended December 31 (in thousands): 2019 $ 177,144 2020 172,821 2021 157,611 2022 138,787 2023 116,985 Thereafter 412,934 Total $ 1,176,282

Component of Rental Income an_2

Component of Rental Income and Expense (Tables)	12 Months Ended
	Dec. 31, 2018
Operating Leases, Income Statement, Lease Revenue [Abstract]
Principal components of rental income	The principal components of rental income are as follows (in thousands): Year Ended December 31, 2018 2017 2016 Minimum rents Retail $ 77,147 $ 76,201 $ 74,050 Office 95,081 93,128 90,281 Multifamily 46,897 40,217 26,962 Mixed-Use 11,019 10,564 10,616 Cost reimbursement 34,584 34,267 33,610 Percentage rent 3,149 3,214 3,096 Hotel revenue 40,049 39,545 39,371 Other 1,611 1,667 1,512 Total rental income $ 309,537 $ 298,803 $ 279,498
Principal components of rental expenses	The principal components of rental expenses are as follows (in thousands): Year Ended December 31, 2018 2017 2016 Rental operating $ 37,322 $ 34,944 $ 31,709 Hotel operating 24,030 24,254 23,607 Repairs and maintenance 13,486 13,136 12,705 Marketing 2,108 2,053 2,117 Rent 3,216 3,119 2,925 Hawaii excise tax 4,333 4,454 4,511 Management fees 1,987 2,046 1,979 Total rental expenses $ 86,482 $ 84,006 $ 79,553

Other Income (Expenses) (Tables

Other Income (Expenses) (Tables)	12 Months Ended
	Dec. 31, 2018
Other Income and Expenses [Abstract]
Principal components of other income (expense), net	The principal components of other income (expense), net are as follows (in thousands): Year Ended December 31, 2018 2017 2016 Interest and investment income $ 238 $ 548 $ 72 Income tax expense (327 ) (214 ) (566 ) Other non-operating income 4 — 126 Total other income (expense) $ (85 ) $ 334 $ (368 )

Segment Reporting (Tables)

Segment Reporting (Tables)	12 Months Ended
	Dec. 31, 2018
Segment Reporting [Abstract]
Schedule of segments operating activity	The following table represents operating activity within our reportable segments (in thousands): Year Ended December 31, 2018 2017 2016 Total Retail Property revenue $ 105,552 $ 103,968 $ 100,982 Property expense (30,078 ) (28,524 ) (27,934 ) Segment profit 75,474 75,444 73,048 Total Office Property revenue 112,362 105,694 103,254 Property expense (33,860 ) (33,120 ) (31,839 ) Segment profit 78,502 72,574 71,415 Total Multifamily Property revenue 50,627 43,533 29,188 Property expense (20,441 ) (17,898 ) (12,498 ) Segment profit 30,186 25,635 16,690 Total Mixed-Use Property revenue 62,326 61,788 61,664 Property expense (37,076 ) (37,135 ) (35,660 ) Segment profit 25,250 24,653 26,004 Total segments’ profit $ 209,412 $ 198,306 $ 187,157
Reconciliation of segment profit to net income attributable to stockholders	The following table is a reconciliation of segment profit to net income attributable to stockholders (in thousands): Year Ended December 31, 2018 2017 2016 Total segments' profit $ 209,412 $ 198,306 $ 187,157 General and administrative (22,784 ) (21,382 ) (17,897 ) Depreciation and amortization (107,093 ) (83,278 ) (71,319 ) Interest expense (52,248 ) (53,848 ) (51,936 ) Other income (expense), net (85 ) 334 (368 ) Net income 27,202 40,132 45,637 Net income attributable to restricted shares (311 ) (241 ) (189 ) Net income attributable to unitholders in the Operating Partnership (7,205 ) (10,814 ) (12,863 ) Net income attributable to American Assets Trust, Inc. stockholders $ 19,686 $ 29,077 $ 32,585
Net Real Estate and Secured note payable balances by Segments	The following table shows net real estate and secured note payable balances for each of the segments, along with their capital expenditures for each year (in thousands): December 31, 2018 December 31, 2017 Net real estate Retail $ 628,734 $ 658,654 Office 822,574 813,121 Multifamily 412,042 424,044 Mixed-Use 176,503 180,888 $ 2,039,853 $ 2,076,707 Secured Notes Payable (1) Retail $ 35,008 $ 35,737 Office 147,757 170,408 Multifamily — 73,744 Mixed-Use — — $ 182,765 $ 279,889 Capital Expenditures (2) Retail $ 14,219 $ 10,412 Office 45,192 35,023 Multifamily 3,659 6,318 Mixed-Use 1,277 670 $ 64,347 $ 52,423 (1) Excludes unamortized debt issuance costs of $0.2 million and $0.3 million as of December 31, 2018 and 2017 , respectively. (2) Capital expenditures represent cash paid for capital expenditures during the year and includes leasing commissions paid.

Quarterly Financial Informati_2

Quarterly Financial Information (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Selected Quarterly Information	The tables below reflect selected American Assets Trust, Inc. quarterly information for 2018 and 2017 (in thousands, except per shares data): Three Months Ended December 31, September 30, June 30, March 31, Total revenue $ 82,605 $ 82,507 $ 85,023 $ 80,732 Operating income 22,091 27,275 17,249 12,920 Net income (loss) 9,209 14,271 4,413 (691 ) Net (income) loss attributable to restricted shares (96 ) (71 ) (216 ) 72 Net (income) loss attributable to unitholders in the Operating Partnership (2,440 ) (3,806 ) (1,125 ) 166 Net income (loss) attributable to American Assets Trust, Inc. stockholders $ 6,673 $ 10,394 $ 3,072 $ (453 ) Net income (loss) per share attributable to common stockholders - basic and diluted $ 0.14 $ 0.22 $ 0.07 $ (0.01 ) Three Months Ended December 31, September 30, June 30, March 31, Total revenue $ 81,746 $ 82,339 $ 77,106 $ 73,792 Operating income 23,792 26,477 20,048 23,329 Net income 9,731 12,505 7,588 10,308 Net income attributable to restricted shares (60 ) (60 ) (61 ) (60 ) Net income attributable to unitholders in the Operating Partnership (2,594 ) (3,351 ) (2,008 ) (2,861 ) Net income attributable to American Assets Trust, Inc. stockholders $ 7,077 $ 9,094 $ 5,519 $ 7,387 Net income per share attributable to common stockholders - basic and diluted $ 0.15 $ 0.19 $ 0.12 $ 0.16 The tables below reflect selected American Assets Trust, L.P. quarterly information for 2018 and 2017 (in thousands, except per shares data): Three Months Ended December 31, September 30, June 30, March 31, Total revenue $ 82,605 $ 82,507 $ 85,023 $ 80,732 Operating income 22,091 27,275 17,249 12,920 Net income 9,209 14,271 4,413 (691 ) Net income attributable to restricted shares (96 ) (71 ) (216 ) 72 Net income attributable to American Assets Trust, L.P. unit holders $ 9,113 $ 14,200 $ 4,197 $ (619 ) Net income per unit attributable to unit holders - basic and diluted $ 0.14 $ 0.22 $ 0.07 $ (0.01 ) Three Months Ended December 31, September 30, June 30, March 31, Total revenue $ 81,746 $ 82,339 $ 77,106 $ 73,792 Operating income 23,792 26,477 20,048 23,329 Net income 9,731 12,505 7,588 10,308 Net income attributable to restricted shares (60 ) (60 ) (61 ) (60 ) Net income attributable to American Assets Trust, L.P. unit holders $ 9,671 $ 12,445 $ 7,527 $ 10,248 Net income per unit attributable to common unit holders - basic and diluted $ 0.15 $ 0.19 $ 0.12 $ 0.16

Summary of Significant Accoun_4

Summary of Significant Accounting Policies (Details)	12 Months Ended
	Dec. 31, 2018USD ($)EmployeeSegmentRoomProperty	Dec. 31, 2017USD ($)Property	Dec. 31, 2016USD ($)	Jan. 01, 2019USD ($)
Summary Of Significant Accounting Policies [Line Items]
Number of Properties Acquired, Asset Acquisition | Property		3
Acquisition cost capitalized		$ 200,000
Document Period End Date	Dec. 31, 2018
Number of employees | Employee	189
Number of office, retail, multifamily and mixed-use operating properties | Property	27
Properties held for development | Property	3
Allowance for doubtful accounts	$ (600,000)	(400,000)
Total bad debt expense	800,000	800,000	$ 800,000
Real estate depreciation expense	$ 99,600,000	70,200,000	62,500,000
Short term liquid investments, initial maturity	3 months
Cash balance at banks, federally insured amount	$ 250,000
Cash balance at banks, excess of FDIC insured limit	42,400,000	45,700,000
Restricted cash	9,316,000	9,344,000	9,950,000
Incremental stock compensation cost from modification	$ 0	2,200,000	0
Number of operating segments | Segment	4
Rooms in mixed-use segment all-suite hotel | Room	369
Future minimum lease payments due	$ 8,922,000
Money Market Funds
Summary Of Significant Accounting Policies [Line Items]
Cash balance at banks, excess of FDIC insured limit	$ 200,000	29,400,000
Minimum
Summary Of Significant Accounting Policies [Line Items]
Percentage of taxable income required to distribute to qualify as real estate investment trust (REIT)	90.00%
Building And Improvement | Minimum
Summary Of Significant Accounting Policies [Line Items]
Real Estate, estimated useful lives	30 years
Building And Improvement | Maximum
Summary Of Significant Accounting Policies [Line Items]
Real Estate, estimated useful lives	40 years
Furniture And Equipment | Minimum
Summary Of Significant Accounting Policies [Line Items]
Real Estate, estimated useful lives	3 years
Furniture And Equipment | Maximum
Summary Of Significant Accounting Policies [Line Items]
Real Estate, estimated useful lives	15 years
Deferred Rent Receivables
Summary Of Significant Accounting Policies [Line Items]
Allowance for doubtful accounts	$ (300,000)	(1,400,000)
Other Income
Summary Of Significant Accounting Policies [Line Items]
General excise tax recognized, gross	$ 3,600,000	$ 3,700,000	$ 3,800,000
Accounting Standards Update 2014-09 | Scenario, Forecast | Minimum
Summary Of Significant Accounting Policies [Line Items]
Right-of-use asset				$ 5,000,000
Lease liability				5,000,000
Accounting Standards Update 2014-09 | Scenario, Forecast | Maximum
Summary Of Significant Accounting Policies [Line Items]
Right-of-use asset				10,000,000
Lease liability				$ 10,000,000

Summary of Significant Accoun_5

Summary of Significant Accounting Policies Supplemental Disclosures Related to Consolidated Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Supplemental cash flow information
Total interest costs incurred	$ 53,736	$ 55,418	$ 53,487
Interest capitalized	1,488	1,570	1,551
Interest expense	52,248	53,848	51,936
Cash paid for interest, net of amounts capitalized	52,632	47,473	47,793
Cash paid for income taxes	462	461	641
Supplemental schedule of noncash investing and financing activities
Increase (decrease) in accounts payable and accrued liabilities for construction in progress	8,379	(2,746)	(435)
Increase (decrease) in accrued leasing commissions	3,534	726	(355)
Reduction to capital for prepaid equity financing costs	$ 241	$ 0	$ 0

Real Estate (Details)

Real Estate (Details) $ in Millions	Jul. 06, 2017USD ($)ft²	Apr. 28, 2017USD ($)unit	Dec. 31, 2017USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2017USD ($)
Real Estate [Line Items]
Acquisition cost capitalized					$ 0.2
Pacific Ridge Apartments
Real Estate [Line Items]
Number of units in real estate property | unit		533
Purchase price consideration		$ 232
Acquisition cost capitalized				$ 0.1
Gateway Marketplace
Real Estate [Line Items]
Purchase price consideration	$ 42
Acquisition cost capitalized			$ 0.1
Area of real estate property | ft²	128,000

Real Estate Summary of Real Est

Real Estate Summary of Real Estate Investments (Details) - USD ($) $ in Thousands		Dec. 31, 2018	Dec. 31, 2017
Real Estate Properties [Line Items]
Construction in progress		$ 71,228	$ 68,272
Total Real estate, at cost		2,630,191	2,614,138
Accumulated depreciation		(590,338)	(537,431)
Net real estate		2,039,853	2,076,707
Total Retail
Real Estate Properties [Line Items]
Net real estate		628,734	658,654
Total Office
Real Estate Properties [Line Items]
Net real estate		822,574	813,121
Real Estate Investment
Real Estate Properties [Line Items]
Land		555,630	555,738
Buildings		1,775,730	1,763,130
Land improvements		61,621	61,078
Tenant improvements		163,740	150,802
Furniture, fixtures, and equipment		23,911	21,263
Construction in progress	[1]	49,559	62,127
Total Real estate, at cost		2,630,191	2,614,138
Accumulated depreciation		(590,338)	(537,431)
Net real estate		2,039,853	2,076,707
Real Estate Investment | Total Retail
Real Estate Properties [Line Items]
Land		262,860	262,860
Buildings		516,566	548,062
Land improvements		43,412	42,401
Tenant improvements		70,210	67,879
Furniture, fixtures, and equipment		570	372
Construction in progress		8,598	3,086
Total Real estate, at cost		902,216	924,660
Accumulated depreciation		(273,482)	(266,006)
Net real estate		628,734	658,654
Real Estate Investment | Total Office
Real Estate Properties [Line Items]
Land		143,467	143,575
Buildings		743,474	705,999
Land improvements		8,825	9,313
Tenant improvements		91,612	80,968
Furniture, fixtures, and equipment		2,671	2,085
Construction in progress		39,511	52,512
Total Real estate, at cost		1,029,560	994,452
Accumulated depreciation		(206,986)	(181,331)
Net real estate		822,574	813,121
Real Estate Investment | Total Multifamily
Real Estate Properties [Line Items]
Land		72,668	72,668
Buildings		389,831	383,210
Land improvements		6,778	6,758
Tenant improvements		0	0
Furniture, fixtures, and equipment		13,844	12,377
Construction in progress		854	6,505
Total Real estate, at cost		483,975	481,518
Accumulated depreciation		(71,933)	(57,474)
Net real estate		412,042	424,044
Real Estate Investment | Total Mixed-Use
Real Estate Properties [Line Items]
Land		76,635	76,635
Buildings		125,859	125,859
Land improvements		2,606	2,606
Tenant improvements		1,918	1,955
Furniture, fixtures, and equipment		6,826	6,429
Construction in progress		596	24
Total Real estate, at cost		214,440	213,508
Accumulated depreciation		(37,937)	(32,620)
Net real estate		$ 176,503	$ 180,888
[1]	Land related to held for development and construction in progress is included in the Held for Development and Construction in Progress classifications on the consolidated balance sheets.

Real Estate Pacific Ridge & Gat

Real Estate Pacific Ridge & Gateway Marketplace Financial Results (Details) - USD ($) $ in Thousands	3 Months Ended								6 Months Ended	8 Months Ended	12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Real Estate [Line Items]
Total revenue	$ 82,605	$ 82,507	$ 85,023	$ 80,732	$ 81,746	$ 82,339	$ 77,106	$ 73,792		$ 12,650	$ 330,867	$ 314,983	$ 295,088
Operating Expenses										16,320	251,332	221,337	197,147
Operating income (loss)	22,091	27,275	17,249	12,920	23,792	26,477	20,048	23,329		(3,670)	79,535	93,646	97,941
Net income	$ 9,209	$ 14,271	$ 4,413	$ (691)	$ 9,731	$ 12,505	$ 7,588	$ 10,308		(3,670)	$ 27,202	$ 40,132	$ 45,637
Pacific Ridge Apartments
Real Estate [Line Items]
Total revenue										10,983
Operating Expenses										15,238
Operating income (loss)										(4,255)
Net income										$ (4,255)
Gateway Marketplace
Real Estate [Line Items]
Total revenue									$ 1,667
Operating Expenses									1,082
Operating income (loss)									585
Net income									$ 585

Real Estate Property Asset Acqu

Real Estate Property Asset Acquisitions (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Real Estate [Line Items]
Acquired in-place leases, net	$ 6,281	$ 8,371
Prepaid expenses, deposits and other	6,683	5,945
TOTAL ASSETS	2,198,250	2,259,864
Accounts payable and accrued expenses	46,616	38,069
Security deposits payable	8,844	6,570
Other liabilities and deferred credits	49,547	46,061
Liabilities	$ 1,395,779	1,415,720
Gateway Marketplace
Real Estate [Line Items]
Land		17,363
Buildings		19,192
Land improvements		1,522
Furniture, fixtures, and equipment		930
Total real estate		39,007
Acquired in-place leases, net		2,920
Prepaid expenses, deposits and other		0
TOTAL ASSETS		41,927
Accounts payable and accrued expenses		203
Security deposits payable		22
Other liabilities and deferred credits		1,034
Liabilities		1,259
Pacific Ridge Apartments
Real Estate [Line Items]
Land		47,971
Buildings		171,813
Land improvements		3,403
Furniture, fixtures, and equipment		3,281
Total real estate		226,468
Acquired in-place leases, net		5,592
Prepaid expenses, deposits and other		424
TOTAL ASSETS		232,484
Accounts payable and accrued expenses		74
Security deposits payable		673
Other liabilities and deferred credits		49
Liabilities		$ 796

Real Estate Pro Forma Financial

Real Estate Pro Forma Financial Information (Details) - USD ($) $ in Thousands	3 Months Ended								8 Months Ended	12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Real Estate [Line Items]
Total revenue	$ 82,605	$ 82,507	$ 85,023	$ 80,732	$ 81,746	$ 82,339	$ 77,106	$ 73,792	$ 12,650	$ 330,867	$ 314,983	$ 295,088
Operating Expenses									16,320	251,332	221,337	197,147
Operating income (loss)	22,091	27,275	17,249	12,920	23,792	26,477	20,048	23,329	(3,670)	79,535	93,646	97,941
Net income	$ 9,209	$ 14,271	$ 4,413	$ (691)	$ 9,731	$ 12,505	$ 7,588	$ 10,308	$ (3,670)	$ 27,202	40,132	45,637
Pro Forma
Real Estate [Line Items]
Total revenue											322,050	312,414
Operating Expenses											230,796	215,631
Operating income (loss)											91,255	96,783
Net income											$ 36,433	$ 41,916

Acquired In-Place Leases and _3

Acquired In-Place Leases and Above/Below Market Leases Summary of Acquired Lease Intangibles (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets, Gross [Abstract]
Acquired lease intangible assets	$ 518	$ 1,178
Net of accumulated amortization of other intangible assets	(981)	(1,115)
Below Market Lease [Abstract]
Below market leases	63,172	67,423
Accumulated accretion	(37,220)	(37,241)
Acquired lease intangible liabilities, net	25,952	30,182
In-place leases
Finite-Lived Intangible Assets, Gross [Abstract]
Acquired lease intangible assets	40,884	54,206
Net of accumulated amortization of other intangible assets	(34,603)	(45,835)
Acquired lease intangible assets, net	6,281
Above market leases
Finite-Lived Intangible Assets, Gross [Abstract]
Acquired lease intangible assets	11,963	21,262
Net of accumulated amortization of other intangible assets	(11,445)	(20,084)
Acquired lease intangible assets, net	518
Acquired lease intangible assets
Finite-Lived Intangible Assets, Gross [Abstract]
Acquired lease intangible assets, net	$ 6,799	$ 9,549

Acquired In-Place Leases and _4

Acquired In-Place Leases and Above/Below Market Leases (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization of acquired above and below market leases	$ 3.6	$ 3.3	$ 3.5
Weighted-average amortization period of below market leases	5 years 11 months
Acquired lease, below market renewal options	$ 14.6
Weighted-average amortization period of acquired leases prior to the commencement of renewal option	8 years 6 months
In-place leases
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted-average amortization period of acquired leases	7 years 10 months
Above market leases
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted-average amortization period of acquired leases	1 year 2 months

Acquired In-Place Leases and _5

Acquired In-Place Leases and Above/Below Market Leases Increases (Decreases) in Net Income as Result of Amortization of In-Place Leases Above Market Leases and Below Market Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization of leases	$ (1,480)	$ (5,464)	$ (558)
Amortization of below market leases	4,230	4,239	4,719
In-place leases
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization of leases	(2,090)	(8,769)	(4,029)
Above market leases
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization of leases	$ (660)	$ (934)	$ (1,248)

Acquired In-Place Leases and _6

Acquired In-Place Leases and Above/Below Market Leases Amortization for Acquired In-Place Leases During Next Five Years and Thereafter Assuming No Early Lease Terminations (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Below Market Lease, Net, Amortization Income, Fiscal Year Maturity [Abstract]
2,019	$ 3,478
2,020	2,647
2,021	2,414
2,022	2,242
2,023	2,073
Thereafter	13,098
Acquired lease intangible liabilities, net	25,952	$ 30,182
In-place leases
Acquired Finite-Lived Intangible Assets [Line Items]
2,019	1,620
2,020	1,053
2,021	719
2,022	632
2,023	539
Thereafter	1,718
Acquired lease intangible assets, net	6,281
Above market leases
Acquired Finite-Lived Intangible Assets [Line Items]
2,019	339
2,020	58
2,021	28
2,022	28
2,023	27
Thereafter	38
Acquired lease intangible assets, net	$ 518

Fair Value of Financial Instr_3

Fair Value of Financial Instruments Liabilities Fair Value Measurement on a Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation liability	$ 1,424	$ 1,156
Interest rate swap asset	6,002	5,091
Interest rate swap liability	801	10
Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation liability	0	0
Interest rate swap asset	0	0
Interest rate swap liability	0	0
Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation liability	0	0
Interest rate swap asset	0	0
Interest rate swap liability	0	0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation liability	1,424	1,156
Interest rate swap asset	6,002	5,091
Interest rate swap liability	$ 801	$ 10

Fair Value of Financial Instr_4

Fair Value of Financial Instruments (Details) - Fair Value, Inputs, Level 2	Dec. 31, 2018
Minimum
Fair Value Inputs Disclosures
Fair value assumptions, interest rate	0.0434
Maximum
Fair Value Inputs Disclosures
Fair value assumptions, interest rate	0.0484

Fair Value of Financial Instr_5

Fair Value of Financial Instruments Carrying Amount and Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Secured notes payable | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	$ 182,572	$ 279,550
Secured notes payable | Estimate of Fair Value Measurement | Fair Value, Inputs, Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	183,253	286,156
Unsecured debt | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	248,765	248,839
Unsecured debt | Estimate of Fair Value Measurement
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	250,000	250,000
Unsecured senior guaranteed notes | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	797,098	796,631
Unsecured senior guaranteed notes | Estimate of Fair Value Measurement | Fair Value, Inputs, Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	790,267	802,699
Unsecured line of credit | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	62,337	0
Unsecured line of credit | Estimate of Fair Value Measurement
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	$ 64,000	$ 0

Other Assets (Details)

Other Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Leasing commissions, net of accumulated amortization of $28,597 and $28,318, respectively	$ 28,796	$ 20,633
Interest rate swap asset	6,002	5,091
Acquired above market leases, net	518	1,178
Acquired in-place leases, net	6,281	8,371
Lease incentives, net of accumulated amortization of $299 and $136, respectively	747	916
Other intangible assets, net of accumulated amortization of $981 and $1,115, respectively	2,994	227
Prepaid expenses, deposits and other	6,683	5,945
Total other assets	52,021	42,361
Leasing commissions, accumulative amortization	28,597	28,318
Lease incentives, accumulated amortization	299	136
Other intangible assets, accumulated amortization	$ 981	$ 1,115

Other Liabilities and Deferre_3

Other Liabilities and Deferred Credits (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Other Liabilities Disclosure [Abstract]
Acquired below market leases, net	$ 25,952	$ 30,182
Prepaid rent and deferred revenue	11,634	8,429
Interest rate swap liability	801	10
Straight-line rent liability	7,393	4,428
Deferred rent expense and lease intangible	2,210	1,670
Deferred compensation	1,424	1,156
Deferred tax liability	93	123
Other liabilities	40	63
Total other liabilities and deferred credits, net	$ 49,547	$ 46,061

Debt Summary of Total Secured N

Debt Summary of Total Secured Notes Payable Outstanding (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Notes payable, total	$ 1,232,765
Secured notes payable | American Assets Trust, L.P.
Debt Instrument [Line Items]
Secured notes payable, Principal Balance	182,765	$ 279,889
Debt issuance costs, net	(193)	(339)
Notes payable, total	$ 182,572	279,550
Number of year amortization schedule	30 years
Debt issuance costs, accumulated amortization	$ 671	1,191
Secured notes payable | American Assets Trust, L.P. | Loma Palisades
Debt Instrument [Line Items]
Secured notes payable, Principal Balance	$ 0	73,744
Stated Interest Rate	6.09%
Stated Maturity Date	Jul. 1, 2018
Secured notes payable | American Assets Trust, L.P. | One Beach Street
Debt Instrument [Line Items]
Secured notes payable, Principal Balance	$ 0	21,900
Stated Interest Rate	3.94%
Stated Maturity Date	Apr. 1, 2019
Secured notes payable | American Assets Trust, L.P. | Torrey Reserve - North Court
Debt Instrument [Line Items]
Secured notes payable, Principal Balance	$ 19,620	20,023
Stated Interest Rate	7.22%
Stated Maturity Date	Jun. 1, 2019
Secured notes payable | American Assets Trust, L.P. | Torrey Reserve-VCI, VCII, VCIII
Debt Instrument [Line Items]
Secured notes payable, Principal Balance	$ 6,635	6,764
Stated Interest Rate	6.36%
Stated Maturity Date	Jun. 1, 2020
Secured notes payable | American Assets Trust, L.P. | Solana Beach Corporate Centre I-II
Debt Instrument [Line Items]
Secured notes payable, Principal Balance	$ 10,502	10,721
Stated Interest Rate	5.91%
Stated Maturity Date	Jun. 1, 2020
Secured notes payable | American Assets Trust, L.P. | Solana Beach Towne Centre
Debt Instrument [Line Items]
Secured notes payable, Principal Balance	$ 35,008	35,737
Stated Interest Rate	5.91%
Stated Maturity Date	Jun. 1, 2020
Secured notes payable | American Assets Trust, L.P. | City Center Bellevue
Debt Instrument [Line Items]
Secured notes payable, Principal Balance	$ 111,000	$ 111,000
Stated Interest Rate	3.98%
Stated Maturity Date	Nov. 1, 2022

Debt Summary of Total Unsecured

Debt Summary of Total Unsecured Notes Payable Outstanding (Details) - USD ($) $ in Thousands

Jun. 23, 2017

May 31, 2017

May 11, 2017

Apr. 25, 2017

Jan. 18, 2017

May 02, 2016

Apr. 07, 2016

Mar. 29, 2016

Mar. 23, 2016

Mar. 01, 2016

Jan. 29, 2016

Dec. 31, 2018

Dec. 31, 2017

Jul. 19, 2017

May 23, 2017

Mar. 01, 2017

Jan. 09, 2014

Debt Instrument [Line Items]

Unsecured notes payable

$ 1,045,863

$ 1,045,470

American Assets Trust, L.P.

Debt Instrument [Line Items]

Unsecured notes payable

$ 1,045,863

1,045,470

American Assets Trust, L.P. | Interest Rate Swap

Debt Instrument [Line Items]

Fixed interest rate on derivative

3.08%

Term of derivative contract

7 years

10 years

10 years

10 years

7 years

American Assets Trust, L.P. | Forward Contracts

Debt Instrument [Line Items]

Term of derivative contract

1 month

Gain on derivatives

$ 700

$ 10,400

$ 1,600

Loss on derivatives

$ 500

Effective interest rate (percent)

3.88%

Term Loan A | American Assets Trust, L.P.

Debt Instrument [Line Items]

Unsecured notes payable

$ 100,000

Term Loan A | American Assets Trust, L.P. | Interest Rate Swap

Debt Instrument [Line Items]

Fixed interest rate on derivative

4.13%

Term Loan B | American Assets Trust, L.P.

Debt Instrument [Line Items]

Stated Maturity Date

Mar. 1, 2023

Mar. 1, 2023

Term Loan B | American Assets Trust, L.P. | Interest Rate Swap

Debt Instrument [Line Items]

Fixed interest rate on derivative

3.15%

Term Loan C | American Assets Trust, L.P.

Debt Instrument [Line Items]

Stated Maturity Date

Mar. 1, 2023

Mar. 1, 2023

Term Loan C | American Assets Trust, L.P. | Interest Rate Swap

Debt Instrument [Line Items]

Fixed interest rate on derivative

3.14%

Senior Guaranteed Notes, Series F | American Assets Trust, L.P. | Forward Contracts

Debt Instrument [Line Items]

Effective interest rate (percent)

3.85%

Senior Guaranteed Notes, Series D | American Assets Trust, L.P. | Forward Contracts

Debt Instrument [Line Items]

Effective interest rate (percent)

3.87%

Senior Guaranteed Notes, Series E | American Assets Trust, L.P. | Forward Contracts

Debt Instrument [Line Items]

Effective interest rate (percent)

4.18%

Unsecured debt | American Assets Trust, L.P.

Debt Instrument [Line Items]

Long-term debt

$ 1,050,000

1,050,000

Debt issuance costs, net

(4,137)

(4,530)

Unsecured notes payable

1,045,863

1,045,470

Debt issuance costs, accumulated amortization

6,844

5,866

Unsecured debt | Term Loan A | American Assets Trust, L.P.

Debt Instrument [Line Items]

Long-term debt

$ 100,000

100,000

Stated Maturity Date

Jan. 9, 2019

Unsecured debt | Senior Guaranteed Notes, Series A | American Assets Trust, L.P.

Debt Instrument [Line Items]

Long-term debt

$ 150,000

150,000

Stated Interest Rate

[1]

4.04%

Stated Maturity Date

Oct. 31, 2021

Unsecured debt | Term Loan B | American Assets Trust, L.P.

Debt Instrument [Line Items]

Long-term debt

$ 100,000

100,000

Stated Maturity Date

Mar. 1, 2023

Unsecured debt | Term Loan C | American Assets Trust, L.P.

Debt Instrument [Line Items]

Long-term debt

$ 50,000

50,000

Stated Maturity Date

Mar. 1, 2023

Unsecured debt | Senior Guaranteed Notes, Series F | American Assets Trust, L.P.

Debt Instrument [Line Items]

Long-term debt

$ 100,000

100,000

Stated Interest Rate

3.78%

3.78%

Stated Maturity Date

Jul. 19, 2024

Unsecured debt | Senior Guaranteed Notes, Series B | American Assets Trust, L.P.

Debt Instrument [Line Items]

Long-term debt

$ 100,000

100,000

Stated Interest Rate

4.45%

Stated Maturity Date

Feb. 2, 2025

Unsecured debt | Senior Guaranteed Notes, Series C | American Assets Trust, L.P.

Debt Instrument [Line Items]

Long-term debt

$ 100,000

100,000

Stated Interest Rate

4.50%

Stated Maturity Date

Apr. 1, 2025

Unsecured debt | Senior Guaranteed Notes, Series D | American Assets Trust, L.P.

Debt Instrument [Line Items]

Long-term debt

$ 250,000

250,000

Stated Interest Rate

4.29%

4.29%

Stated Maturity Date

Mar. 1, 2027

Unsecured debt | Senior Guaranteed Notes, Series E | American Assets Trust, L.P.

Debt Instrument [Line Items]

Long-term debt

$ 100,000

$ 100,000

Stated Interest Rate

4.24%

[2]

4.24%

Stated Maturity Date

May 23, 2029

[1]

The company entered into a one-month forward-starting seven-year swap contract on August 19, 2014, which was settled on September 19, 2014 at a gain of approximately $1.6 million (see Note 8). The forward-starting seven-year swap contract was deemed to be a highly effective cash flow hedge, accordingly, the effective interest rate is approximately 3.88% per annum.

[2]

The Operating Partnership entered into a treasury lock contract on April 25, 2017, which was settled on May 11, 2017 at a gain of approximately $0.7 million. The treasury lock contract was deemed to be a highly effective cash flow hedge, accordingly, the effective interest rate is approximately 4.18% per annum.

Debt Scheduled Principal Paymen

Debt Scheduled Principal Payments on Notes Payable (Details) $ in Thousands	Dec. 31, 2018USD ($)
Debt Disclosure [Abstract]
2,019	$ 120,762
2,020	51,003
2,021	150,000
2,022	111,000
2,023	150,000
Thereafter	650,000
Notes payable, total	$ 1,232,765

Debt (Details)

Debt (Details)

Jan. 09, 2019Extension_Option

Jan. 09, 2018USD ($)Extension_Option

Apr. 25, 2017

May 02, 2016USD ($)

Mar. 23, 2016

Mar. 01, 2016USD ($)

Jan. 29, 2016

Oct. 31, 2014USD ($)

Jan. 09, 2014USD ($)Extension_Option

Dec. 31, 2018USD ($)

Dec. 31, 2017USD ($)

Jul. 19, 2017USD ($)

May 23, 2017USD ($)

Mar. 01, 2017USD ($)

Debt Instrument [Line Items]

Line of Credit Facility, Interest Rate During Period

3.20%

Unsecured line of credit

$ 62,337,000

$ 0

Unsecured notes payable

1,045,863,000

1,045,470,000

Unsecured line of credit

Debt Instrument [Line Items]

Maximum leverage ratio of revolving credit facility

60.00%

Maximum secured leverage ratio on revolving credit facility

40.00%

Minimum fixed charge coverage ratio covenant threshold

1.5

1.5

Minimum interest coverage ratio covenant threshold

175.00%

175.00%

Maximum unsecured leverage ratio (in percents)

60.00%

Minimum tangible net worth

$ 721,160,000

Percent of net proceeds of any additional equity issuances in relation to net proceeds as of Offering

75.00%

Maximum recourse indebtedness of total asset value (in percents)

15.00%

Percentage annual distributions cannot exceed funds from operations

95.00%

Unsecured line of credit | Federal Funds Rate

Debt Instrument [Line Items]

Basis spread on variable rate (in percents)

0.50%

0.50%

Unsecured line of credit | Eurodollar

Debt Instrument [Line Items]

Basis spread on variable rate (in percents)

1.00%

1.00%

Term Loan B | Unsecured debt | Federal Funds Rate

Debt Instrument [Line Items]

Basis spread on federal funds rate

0.50%

0.50%

Term Loan B | Unsecured debt | Eurodollar

Debt Instrument [Line Items]

Basis spread on Eurodollar rate

0.10%

1.00%

Term Loan C | Unsecured debt | Federal Funds Rate

Debt Instrument [Line Items]

Basis spread on federal funds rate

0.50%

Term Loan C | Unsecured debt | Eurodollar

Debt Instrument [Line Items]

Basis spread on Eurodollar rate

0.10%

American Assets Trust, L.P.

Debt Instrument [Line Items]

Unsecured line of credit

62,337,000

0

Unsecured notes payable

1,045,863,000

1,045,470,000

American Assets Trust, L.P. | Unsecured line of credit | Base Rate

Debt Instrument [Line Items]

Variable rate basis

base rate

American Assets Trust, L.P. | Unsecured line of credit | Revolving Credit Facility

Debt Instrument [Line Items]

Number of extensions available | Extension_Option

2

Extension term (in months)

6 months

American Assets Trust, L.P. | Unsecured debt

Debt Instrument [Line Items]

Unsecured notes payable

$ 1,045,863,000

$ 1,045,470,000

American Assets Trust, L.P. | Term Loan A

Debt Instrument [Line Items]

Unsecured notes payable

$ 100,000,000

American Assets Trust, L.P. | Term Loan A | Unsecured debt

Debt Instrument [Line Items]

Stated Maturity Date

Jan. 9, 2019

American Assets Trust, L.P. | Term Loan B

Debt Instrument [Line Items]

Number of year amortization schedule

7 years

7 years

Face amount of debt

$ 100,000,000

Stated Maturity Date

Mar. 1, 2023

Mar. 1, 2023

American Assets Trust, L.P. | Term Loan B | Minimum | Base Rate

Debt Instrument [Line Items]

Basis spread on variable rate (in percents)

0.70%

0.70%

American Assets Trust, L.P. | Term Loan B | Maximum | Base Rate

Debt Instrument [Line Items]

Basis spread on variable rate (in percents)

1.35%

1.35%

American Assets Trust, L.P. | Term Loan B | Unsecured debt

Debt Instrument [Line Items]

Face amount of debt

$ 100,000,000

Stated Maturity Date

Mar. 1, 2023

American Assets Trust, L.P. | Term Loan B | Unsecured debt | LIBOR

Debt Instrument [Line Items]

Variable rate basis

LIBOR

LIBOR

American Assets Trust, L.P. | Term Loan B | Unsecured debt | Base Rate

Debt Instrument [Line Items]

Minimum base rate

0.00%

0.00%

Prime rate

prime rate

prime rate

Federal funds rate

federal funds rate

federal funds rate

Eurodollar

Eurodollar

Eurodollar

American Assets Trust, L.P. | Term Loan B | Unsecured debt | Minimum | LIBOR

Debt Instrument [Line Items]

Basis spread on variable rate (in percents)

1.20%

1.70%

American Assets Trust, L.P. | Term Loan B | Unsecured debt | Maximum | LIBOR

Debt Instrument [Line Items]

Basis spread on variable rate (in percents)

1.70%

2.35%

American Assets Trust, L.P. | Term Loan B & Term Loan C | Unsecured debt

Debt Instrument [Line Items]

Face amount of debt

$ 150,000,000

American Assets Trust, L.P. | Term Loan C

Debt Instrument [Line Items]

Number of year amortization schedule

7 years

7 years

Face amount of debt

$ 50,000,000

Stated Maturity Date

Mar. 1, 2023

Mar. 1, 2023

American Assets Trust, L.P. | Term Loan C | Minimum | Base Rate

Debt Instrument [Line Items]

Basis spread on variable rate (in percents)

0.70%

0.70%

American Assets Trust, L.P. | Term Loan C | Maximum | Base Rate

Debt Instrument [Line Items]

Basis spread on variable rate (in percents)

1.35%

1.35%

American Assets Trust, L.P. | Term Loan C | Unsecured debt

Debt Instrument [Line Items]

Face amount of debt

$ 50,000,000

Stated Maturity Date

Mar. 1, 2023

American Assets Trust, L.P. | Term Loan C | Unsecured debt | LIBOR

Debt Instrument [Line Items]

Variable rate basis

LIBOR

LIBOR

American Assets Trust, L.P. | Term Loan C | Unsecured debt | Base Rate

Debt Instrument [Line Items]

Minimum base rate

0.00%

0.00%

Prime rate

prime rate

prime rate

Federal funds rate

federal funds rate

federal funds rate

Eurodollar

Eurodollar

Eurodollar

American Assets Trust, L.P. | Term Loan C | Unsecured debt | Minimum | LIBOR

Debt Instrument [Line Items]

Basis spread on variable rate (in percents)

1.20%

1.70%

American Assets Trust, L.P. | Term Loan C | Unsecured debt | Maximum | LIBOR

Debt Instrument [Line Items]

Basis spread on variable rate (in percents)

1.70%

2.35%

American Assets Trust, L.P. | Note Purchase Agreement | Senior Guaranteed Notes

Debt Instrument [Line Items]

Face amount of debt

$ 350,000,000

Partial debt repayment, minimum percentage of principal (in percent)

5.00%

Full debt repayment percentage of principal plus a Make-Whole Amount (in percent)

100.00%

American Assets Trust, L.P. | Note Purchase Agreement | Senior Guaranteed Notes, Series A

Debt Instrument [Line Items]

Face amount of debt

$ 150,000,000

Stated Interest Rate

4.04%

American Assets Trust, L.P. | Note Purchase Agreement | Senior Guaranteed Notes, Series B

Debt Instrument [Line Items]

Face amount of debt

$ 100,000,000

Stated Interest Rate

4.45%

American Assets Trust, L.P. | Note Purchase Agreement | Senior Guaranteed Notes, Series C

Debt Instrument [Line Items]

Face amount of debt

$ 100,000,000

Stated Interest Rate

4.50%

American Assets Trust, L.P. | Amended and Restated Credit Facility

Debt Instrument [Line Items]

Revolving credit facility borrowing limit, maximum borrowing capacity

350,000,000

Allowable additional borrowing capacity

$ 250,000,000

American Assets Trust, L.P. | Amended and Restated Credit Facility | Minimum | Revolving Credit Facility | Base Rate

Debt Instrument [Line Items]

Basis spread on variable rate (in percents)

0.35%

American Assets Trust, L.P. | Amended and Restated Credit Facility | Maximum | Revolving Credit Facility | Base Rate

Debt Instrument [Line Items]

Basis spread on variable rate (in percents)

0.95%

American Assets Trust, L.P. | Amended and Restated Credit Facility | Unsecured line of credit | Base Rate

Debt Instrument [Line Items]

Prime rate

prime rate

Federal funds rate

federal funds rate

Eurodollar

Eurodollar

American Assets Trust, L.P. | Amended and Restated Credit Facility | Unsecured line of credit | Revolving Credit Facility

Debt Instrument [Line Items]

Revolving credit facility borrowing limit, maximum borrowing capacity

$ 250,000,000

American Assets Trust, L.P. | Amended and Restated Credit Facility | Unsecured line of credit | Revolving Credit Facility | LIBOR

Debt Instrument [Line Items]

Variable rate basis

LIBOR

American Assets Trust, L.P. | Amended and Restated Credit Facility | Unsecured line of credit | Minimum | Revolving Credit Facility | LIBOR

Debt Instrument [Line Items]

Basis spread on variable rate (in percents)

1.35%

American Assets Trust, L.P. | Amended and Restated Credit Facility | Unsecured line of credit | Maximum | Revolving Credit Facility | LIBOR

Debt Instrument [Line Items]

Basis spread on variable rate (in percents)

1.95%

American Assets Trust, L.P. | Amended and Restated Credit Facility | Unsecured debt

Debt Instrument [Line Items]

Revolving credit facility borrowing limit, maximum borrowing capacity

$ 100,000,000

Number of extensions available | Extension_Option

3

Extension term (in months)

12 months

American Assets Trust, L.P. | Amended and Restated Credit Facility | Unsecured debt | Minimum | LIBOR

Debt Instrument [Line Items]

Basis spread on variable rate (in percents)

1.30%

American Assets Trust, L.P. | Amended and Restated Credit Facility | Unsecured debt | Minimum | Base Rate

Debt Instrument [Line Items]

Basis spread on variable rate (in percents)

0.30%

American Assets Trust, L.P. | Amended and Restated Credit Facility | Unsecured debt | Maximum | LIBOR

Debt Instrument [Line Items]

Basis spread on variable rate (in percents)

1.90%

American Assets Trust, L.P. | Amended and Restated Credit Facility | Unsecured debt | Maximum | Base Rate

Debt Instrument [Line Items]

Basis spread on variable rate (in percents)

0.90%

American Assets Trust, L.P. | Senior Guaranteed Notes, Series D | Unsecured debt

Debt Instrument [Line Items]

Face amount of debt

$ 250,000,000

Stated Maturity Date

Mar. 1, 2027

Stated Interest Rate

4.29%

4.29%

American Assets Trust, L.P. | Senior Guaranteed Notes, Series E | Unsecured debt

Debt Instrument [Line Items]

Number of year amortization schedule

12 years

Face amount of debt

$ 100,000,000

Stated Maturity Date

May 23, 2029

Stated Interest Rate

4.24%

[1]

4.24%

American Assets Trust, L.P. | Senior Guaranteed Notes, Series F | Unsecured debt

Debt Instrument [Line Items]

Face amount of debt

$ 100,000,000

Stated Maturity Date

Jul. 19, 2024

Stated Interest Rate

3.78%

3.78%

American Assets Trust, L.P. | Second Amended and Restated Credit Facility

Debt Instrument [Line Items]

Revolving credit facility borrowing limit, maximum borrowing capacity

$ 450,000,000

Allowable additional borrowing capacity

$ 350,000,000

American Assets Trust, L.P. | Second Amended and Restated Credit Facility | Unsecured line of credit

Debt Instrument [Line Items]

Unsecured line of credit

$ 64,000,000

American Assets Trust, L.P. | Second Amended and Restated Credit Facility | Unsecured line of credit | Base Rate

Debt Instrument [Line Items]

Prime rate

prime rate

Federal funds rate

federal funds rate

American Assets Trust, L.P. | Second Amended and Restated Credit Facility | Unsecured line of credit | Revolving Credit Facility

Debt Instrument [Line Items]

Revolving credit facility borrowing limit, maximum borrowing capacity

$ 350,000,000

Number of extensions available | Extension_Option

2

Extension term (in months)

6 months

American Assets Trust, L.P. | Second Amended and Restated Credit Facility | Unsecured line of credit | Revolving Credit Facility | LIBOR

Debt Instrument [Line Items]

Variable rate basis

LIBOR

American Assets Trust, L.P. | Second Amended and Restated Credit Facility | Unsecured line of credit | Minimum | Revolving Credit Facility | LIBOR

Debt Instrument [Line Items]

Basis spread on variable rate (in percents)

1.05%

American Assets Trust, L.P. | Second Amended and Restated Credit Facility | Unsecured line of credit | Minimum | Revolving Credit Facility | Base Rate

Debt Instrument [Line Items]

Basis spread on variable rate (in percents)

0.10%

American Assets Trust, L.P. | Second Amended and Restated Credit Facility | Unsecured line of credit | Maximum | Revolving Credit Facility | LIBOR

Debt Instrument [Line Items]

Basis spread on variable rate (in percents)

1.50%

American Assets Trust, L.P. | Second Amended and Restated Credit Facility | Unsecured line of credit | Maximum | Revolving Credit Facility | Base Rate

Debt Instrument [Line Items]

Basis spread on variable rate (in percents)

0.50%

American Assets Trust, L.P. | Second Amended and Restated Credit Facility | Unsecured debt

Debt Instrument [Line Items]

Revolving credit facility borrowing limit, maximum borrowing capacity

$ 100,000,000

American Assets Trust, L.P. | Second Amended and Restated Credit Facility | Unsecured debt | Minimum | LIBOR

Debt Instrument [Line Items]

Basis spread on variable rate (in percents)

1.30%

American Assets Trust, L.P. | Second Amended and Restated Credit Facility | Unsecured debt | Minimum | Base Rate

Debt Instrument [Line Items]

Basis spread on variable rate (in percents)

0.30%

American Assets Trust, L.P. | Second Amended and Restated Credit Facility | Unsecured debt | Maximum | LIBOR

Debt Instrument [Line Items]

Basis spread on variable rate (in percents)

1.90%

American Assets Trust, L.P. | Second Amended and Restated Credit Facility | Unsecured debt | Maximum | Base Rate

Debt Instrument [Line Items]

Basis spread on variable rate (in percents)

0.90%

Interest Rate Swap | American Assets Trust, L.P.

Debt Instrument [Line Items]

Fixed interest rate on derivative

3.08%

Interest Rate Swap | American Assets Trust, L.P. | Term Loan A

Debt Instrument [Line Items]

Fixed interest rate on derivative

4.13%

Interest Rate Swap | American Assets Trust, L.P. | Term Loan B

Debt Instrument [Line Items]

Fixed interest rate on derivative

3.15%

Interest Rate Swap | American Assets Trust, L.P. | Term Loan C

Debt Instrument [Line Items]

Fixed interest rate on derivative

3.14%

Subsequent Event | Term Loan A | Unsecured debt | Federal Funds Rate

Debt Instrument [Line Items]

Basis spread on federal funds rate

0.50%

Subsequent Event | Term Loan A | Unsecured debt | Eurodollar

Debt Instrument [Line Items]

Basis spread on Eurodollar rate

1.00%

Subsequent Event | American Assets Trust, L.P. | Term Loan A | Minimum | Base Rate

Debt Instrument [Line Items]

Basis spread on variable rate (in percents)

0.20%

Subsequent Event | American Assets Trust, L.P. | Term Loan A | Maximum | Base Rate

Debt Instrument [Line Items]

Basis spread on variable rate (in percents)

0.70%

Subsequent Event | American Assets Trust, L.P. | Term Loan A | Unsecured debt

Debt Instrument [Line Items]

Number of extensions available | Extension_Option

3

Extension term (in months)

1 year

Subsequent Event | American Assets Trust, L.P. | Term Loan A | Unsecured debt | LIBOR

Debt Instrument [Line Items]

Variable rate basis

LIBOR

Subsequent Event | American Assets Trust, L.P. | Term Loan A | Unsecured debt | Base Rate

Debt Instrument [Line Items]

Prime rate

prime rate

Federal funds rate

federal funds rate

Eurodollar

Eurodollar

Subsequent Event | American Assets Trust, L.P. | Term Loan A | Unsecured debt | Minimum | LIBOR

Debt Instrument [Line Items]

Basis spread on variable rate (in percents)

1.20%

Subsequent Event | American Assets Trust, L.P. | Term Loan A | Unsecured debt | Maximum | LIBOR

Debt Instrument [Line Items]

Basis spread on variable rate (in percents)

1.70%

[1]

The Operating Partnership entered into a treasury lock contract on April 25, 2017, which was settled on May 11, 2017 at a gain of approximately $0.7 million. The treasury lock contract was deemed to be a highly effective cash flow hedge, accordingly, the effective interest rate is approximately 4.18% per annum.

Derivative and Hedging (Details

Derivative and Hedging (Details) - USD ($)

Jan. 09, 2018

Jun. 23, 2017

May 31, 2017

May 11, 2017

Apr. 25, 2017

Mar. 31, 2017

Jan. 18, 2017

May 02, 2016

Apr. 07, 2016

Mar. 29, 2016

Mar. 23, 2016

Mar. 01, 2016

Jan. 29, 2016

Dec. 31, 2018

Dec. 31, 2017

May 23, 2017

Derivative Instruments and Hedging Activities Disclosures [Line Items]

Derivative liabilities at fair value

$ (801,000)

$ (10,000)

Interest rate swap asset

$ 6,002,000

$ 5,091,000

Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap

Derivative Instruments and Hedging Activities Disclosures [Line Items]

Notional amount

$ 100,000,000

$ 150,000,000

Fixed interest rate on derivative

1.748%

1.88%

American Assets Trust, L.P. | Interest Rate Swap

Derivative Instruments and Hedging Activities Disclosures [Line Items]

Fixed interest rate on derivative

3.08%

Term of derivative contract

7 years

10 years

10 years

10 years

7 years

American Assets Trust, L.P. | Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap

Derivative Instruments and Hedging Activities Disclosures [Line Items]

Notional amount

$ 50,000,000

$ 100,000,000

$ 100,000,000

Fixed interest rate on derivative

1.441%

1.4485%

3.08%

Term of derivative contract

7 years

7 years

Maturity date

Mar. 31, 2027

Mar. 31, 2027

Mar. 1, 2023

Mar. 1, 2023

Effective date

Mar. 31, 2017

Mar. 31, 2017

May 2, 2016

Mar. 1, 2016

Loss recognized in other comprehensive income (loss)

$ 10,400,000

American Assets Trust, L.P. | Cash Flow Hedging | Designated as Hedging Instrument | Treasury Lock

Derivative Instruments and Hedging Activities Disclosures [Line Items]

Notional amount

$ 100,000,000

$ 100,000,000

Fixed interest rate on derivative

2.064%

2.313%

Maturity date

Jul. 26, 2017

Loss recognized in other comprehensive income (loss)

$ 500,000

$ 700,000

Bank of America, N.A. | American Assets Trust, L.P. | Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap, 1/9/2019

Derivative Instruments and Hedging Activities Disclosures [Line Items]

Notional amount

$ 100,000,000

Maturity date

Jan. 9, 2019

Effective date

Jan. 9, 2014

Interest rate swap asset

$ 18,000

Bank of America, N.A. | American Assets Trust, L.P. | Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap, 1/9/2021 [Member]

Derivative Instruments and Hedging Activities Disclosures [Line Items]

Notional amount

$ 100,000,000

Maturity date

Jan. 9, 2021

Effective date

Jan. 9, 2019

Derivative liabilities at fair value

$ (801,000)

U.S. Bank N.A. | American Assets Trust, L.P. | Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap, 3/1/2023

Derivative Instruments and Hedging Activities Disclosures [Line Items]

Notional amount

$ 100,000,000

Maturity date

Mar. 1, 2023

Effective date

Mar. 1, 2016

Interest rate swap asset

$ 3,976,000

Wells Fargo Bank, N.A. | American Assets Trust, L.P. | Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap, 3/31/2027 $150M

Derivative Instruments and Hedging Activities Disclosures [Line Items]

Notional amount

$ 150,000,000

Wells Fargo Bank, N.A. | American Assets Trust, L.P. | Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap, 3/31/2027 $100M

Derivative Instruments and Hedging Activities Disclosures [Line Items]

Notional amount

$ 100,000,000

Wells Fargo Bank, N.A. | American Assets Trust, L.P. | Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap, 3/1/2023

Derivative Instruments and Hedging Activities Disclosures [Line Items]

Notional amount

$ 50,000,000

Maturity date

Mar. 1, 2023

Effective date

May 2, 2016

Interest rate swap asset

$ 2,008,000

Term Loan B | American Assets Trust, L.P.

Derivative Instruments and Hedging Activities Disclosures [Line Items]

Stated Maturity Date

Mar. 1, 2023

Mar. 1, 2023

Face amount of debt

$ 100,000,000

Number of year amortization schedule

7 years

7 years

Term Loan B | American Assets Trust, L.P. | Interest Rate Swap

Derivative Instruments and Hedging Activities Disclosures [Line Items]

Fixed interest rate on derivative

3.15%

Term Loan C | American Assets Trust, L.P.

Derivative Instruments and Hedging Activities Disclosures [Line Items]

Stated Maturity Date

Mar. 1, 2023

Mar. 1, 2023

Face amount of debt

$ 50,000,000

Number of year amortization schedule

7 years

7 years

Term Loan C | American Assets Trust, L.P. | Interest Rate Swap

Derivative Instruments and Hedging Activities Disclosures [Line Items]

Fixed interest rate on derivative

3.14%

Unsecured debt | American Assets Trust, L.P.

Derivative Instruments and Hedging Activities Disclosures [Line Items]

Number of year amortization schedule

10 years

Term Loan A | American Assets Trust, L.P. | Interest Rate Swap

Derivative Instruments and Hedging Activities Disclosures [Line Items]

Fixed interest rate on derivative

4.13%

Unsecured debt | Term Loan B | American Assets Trust, L.P.

Derivative Instruments and Hedging Activities Disclosures [Line Items]

Stated Maturity Date

Mar. 1, 2023

Face amount of debt

$ 100,000,000

Unsecured debt | Term Loan C | American Assets Trust, L.P.

Derivative Instruments and Hedging Activities Disclosures [Line Items]

Stated Maturity Date

Mar. 1, 2023

Face amount of debt

$ 50,000,000

Unsecured debt | Senior Guaranteed Notes, Series E | American Assets Trust, L.P.

Derivative Instruments and Hedging Activities Disclosures [Line Items]

Stated Maturity Date

May 23, 2029

Face amount of debt

$ 100,000,000

Number of year amortization schedule

12 years

Unsecured debt | Term Loan A | American Assets Trust, L.P.

Derivative Instruments and Hedging Activities Disclosures [Line Items]

Stated Maturity Date

Jan. 9, 2019

Partners Capital of American _2

Partners Capital of American Assets Trust, L.P. (Details) - shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Capital Unit [Line Items]
Ownership percent by parent	73.20%
Common Stock
Capital Unit [Line Items]
Conversion of operating partnership units (in shares)	17,372	693,842	10,694
American Assets Trust, L.P.
Capital Unit [Line Items]
Noncontrolling common units (in shares)	17,177,608
Percentage of ownership interests classified as noncontrolling	26.80%
American Assets Trust, L.P. | Common Stock
Capital Unit [Line Items]
Conversion of operating partnership units (in shares)	17,372	693,842	10,694

Equity of American Assets Tru_3

Equity of American Assets Trust, Inc. (Details)	May 27, 2015USD ($)Agent	May 06, 2013USD ($)Agent	Dec. 31, 2018USD ($)$ / sharesshares	Dec. 31, 2017USD ($)shares	Dec. 31, 2016USD ($)shares
Equity [Line Items]
Preferred stock, shares authorized (in shares)			10,000,000
Preferred stock, par-value (in dollars per share) | $ / shares			$ 0.01
Preferred stock, shares issued (in shares)			0
Preferred stock, shares outstanding (in shares)			0
Equity incentive award plan, common stock authorized for issuance (in shares)			4,054,411
Equity incentive award plan, common stock available for future issuance (in shares)			2,595,189
Noncash compensation expense | $			$ 3,000,000	$ 4,700,000	$ 2,400,000
Unrecognized compensation expense | $			$ 6,500,000
Weighted average unvested shares outstanding (in shares)			271,905	230,602	176,408
American Assets Trust, L.P.
Equity [Line Items]
Antidilutive securities excluded from computation of EPS (in shares)			271,905	230,602	176,408
Restricted Stock
Equity [Line Items]
Unrecognized compensation expense, weighted-average recognition period (in years)			1 year 7 months 10 days
At The Market Equity Program
Equity [Line Items]
Aggregate offering price of common share | $	$ 250,000,000	$ 150,000,000
Common shares issued (in shares)			0
Remaining capacity available for issuance | $			$ 176,200,000
$150.0 Million ATM | At The Market Equity Program
Equity [Line Items]
Number of sales agents | Agent		4
$250.0 Million ATM | At The Market Equity Program
Equity [Line Items]
Number of sales agents | Agent	5

Equity of American Assets Tru_4

Equity of American Assets Trust, Inc. Dividends Declared and Paid on Shares of Common Stock and Noncontrolling Common Units (Details) - $ / shares

3 Months Ended

12 Months Ended

Dec. 31, 2018

Sep. 30, 2018

Jun. 30, 2018

Mar. 31, 2018

Dec. 31, 2017

Sep. 30, 2017

Jun. 30, 2017

Mar. 31, 2017

Dec. 31, 2016

Sep. 30, 2016

Jun. 30, 2016

Mar. 31, 2016

Dec. 31, 2018

Dec. 31, 2017

Dec. 31, 2016

Equity [Abstract]

Dividends period

Fourth Quarter 2018

Third Quarter 2018

Second Quarter 2018

First Quarter 2018

Fourth Quarter 2017

Third Quarter 2017

Second Quarter 2017

First Quarter 2017

Fourth Quarter 2016

Third Quarter 2016

Second Quarter 2016

First Quarter 2016

Amount per Share/Unit (in USD per unit)

$ 0.28

$ 0.27

$ 0.27

$ 0.27

$ 0.27

$ 0.26

$ 0.26

$ 0.26

$ 0.26

$ 0.25

$ 0.25

$ 0.25

$ 1.09

$ 1.05

$ 1.01

Date dividend to be paid

Dec. 27, 2018

Sep. 27, 2018

Jun. 28, 2018

Mar. 19, 2018

Dec. 21, 2017

Sep. 28, 2017

Jun. 29, 2017

Mar. 30, 2017

Dec. 22, 2016

Sep. 29, 2016

Jun. 24, 2016

Mar. 25, 2016

Equity of American Assets Tru_5

Equity of American Assets Trust, Inc. Summary of Income Tax Status of Dividends Per Share Paid (Details) - $ / shares	3 Months Ended												12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Equity [Abstract]
Ordinary income (in USD per share)													$ 1.05	$ 1.05	$ 1.01
Capital gain (in USD per share)													0	0	0
Return of capital (in USD per share)													0.04	0	0
Total (in USD per share)	$ 0.28	$ 0.27	$ 0.27	$ 0.27	$ 0.27	$ 0.26	$ 0.26	$ 0.26	$ 0.26	$ 0.25	$ 0.25	$ 0.25	$ 1.09	$ 1.05	$ 1.01
Ordinary income													96.30%	100.00%	100.00%
Capital gain													0.00%	0.00%	0.00%
Return of capital													3.70%	0.00%	0.00%
Total													100.00%	100.00%	100.00%

Equity of American Assets Tru_6

Equity of American Assets Trust, Inc. Restricted Common Stock Issued (Details) - Restricted Stock - $ / shares

Dec. 06, 2018

Jun. 12, 2018

[1]

Dec. 15, 2017

Jun. 13, 2017

[1]

Dec. 01, 2016

Jun. 14, 2016

[1]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Award vesting percentage

33.30%

33.30%

Granted, Weighted Average Grant Date Fair Value (in USD per share)

$ 37.58

$ 27.27

$ 40.99

$ 40.81

Granted, Shares

199,790

[2]

5,320

145,218

[2]

4,880

143,210

[3]

4,900

Minimum

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Granted, Weighted Average Grant Date Fair Value (in USD per share)

[2]

$ 25.68

$ 28.24

Maximum

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Granted, Weighted Average Grant Date Fair Value (in USD per share)

[2]

$ 28.18

$ 35.71

[1]

Restricted common stock issued to members of the company's non-employee directors. These awards of restricted stock will vest subject to the director's continued service on the Board of Directors on the earlier of (i) the one year anniversary of the date of grant or (ii) the date of the next annual meeting of our stockholders, if such non-employee director continues his or her service on the Board of Directors until the next annual meeting of stockholders, but not thereafter, pursuant to our independent director compensation policy.

[2]

Restricted common stock issued to certain of the company's senior management and other employees, which are subject to pre-defined market specific performance criteria based vesting. Shares of restricted stock may vest based on performance calculations determined as of November 30, 2018, subject to the employee's continued employment on that date.

[3]

Restricted common stock issued to certain of the company's senior management and other employees, which are subject to pre-defined market specific performance criteria based vesting. Up to one-third of the shares of restricted stock may vest based on performance calculations determined as of November 30, 2017, 2018 and 2019, subject to the employee's continued employment on those dates.

Equity of American Assets Tru_7

Equity of American Assets Trust, Inc. Summary of Activity of Restricted Stock Awards (Details) - Restricted Stock Units (RSUs)	12 Months Ended
	Dec. 31, 2018$ / sharesshares
Nonvested, Number of Shares
Nonvested, Beginning, Shares | shares	268,768
Granted, Shares | shares	205,110
Vested, Shares | shares	(52,810)
Forfeited, Shares | shares	(78,975)
Nonvested, Ending, Shares | shares	342,093
Nonvested, Weighted Average Grant Date Fair Value
Nonvested, Beginning, Weighted Average Grant Date Fair Value (in USD per Share) | $ / shares	$ 29.89
Granted, Weighted Average Grant Date Fair Value (in USD per share) | $ / shares	27.25
Vested, Weighted Average Grant Date Fair Value (in USD per share) | $ / shares	30.04
Forfeited, Weighted Average Grant Date Fair Value (in USD per share) | $ / shares	29.70
Nonvested, End of Year, Weighted Average Grant Date Fair Value (in USD per Share) | $ / shares	$ 28.33

Equity of American Assets Tru_8

Equity of American Assets Trust, Inc. Computation of Basic and Diluted EPS (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
NUMERATOR
Net income from operations									$ 27,202	$ 40,132	$ 45,637
Less: Net income attributable to restricted shares	$ (96)	$ (71)	$ (216)	$ 72	$ (60)	$ (60)	$ (61)	$ (60)	(311)	(241)	(189)
Less: Income from operations attributable to unitholders in the Operating Partnership									7,205	10,814	12,863
NET INCOME ATTRIBUTABLE TO AMERICAN ASSETS TRUST, INC. STOCKHOLDERS	$ 6,673	$ 10,394	$ 3,072	$ (453)	$ 7,077	$ 9,094	$ 5,519	$ 7,387	19,686	29,077	32,585
Income from operations attributable to American Assets Trust, Inc. common stockholders—basic									19,686	29,077	32,585
Plus: Income from operations attributable to unitholders in the Operating Partnership									(7,205)	(10,814)	(12,863)
Net income attributable to common stockholders-diluted									$ 26,891	$ 39,891	$ 45,448
DENOMINATOR
Weighted average shares of common stock outstanding-basic (in shares)									46,950,812	46,715,520	45,332,471
Effect of dilutive securities-conversion of Operating Partnership units (in shares)									17,185,747	17,371,730	17,895,688
Weighted average common shares outstanding - diluted (in shares)									64,136,559	64,087,250	63,228,159
Earnings (loss) per common share-basic
Basic net income attributable to common stockholders per share (in dollars per share)									$ 0.42	$ 0.62	$ 0.72
Earnings (loss) per common share-diluted
Diluted net income attributable to common stockholders per share (in dollars per share)									$ 0.42	$ 0.62	$ 0.72

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Deferred tax liabilities	$ 93	$ 123

Income Taxes Income Tax Provisi

Income Taxes Income Tax Provision Included in Other Income Expense on Consolidated Statement of Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Statement [Abstract]
Federal	$ 60	$ 0	$ 132
State	465	422	341
Federal	(6)	0	0
State	(192)	(208)	93
Provision for income taxes	$ 327	$ 214	$ 566

Commitments and Contingencies_3

Commitments and Contingencies (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018USD ($)PropertymoCustomerOptionPlan	Dec. 31, 2017
Commitment And Contingencies [Line Items]
Termination payment, as high as | $	$ 7.6
Transfer taxes accrued in connection with the Offering | $	$ 6.6
Maximum percentage of total revenue provided by any single tenant	10.00%	10.00%
Southern California
Commitment And Contingencies [Line Items]
Number of consolidated properties located in Southern California | Property	14
Total Revenue | Southern California
Commitment And Contingencies [Line Items]
Percentage of total revenue provided by properties	33.60%
Total Revenue | Hawaii
Commitment And Contingencies [Line Items]
Percentage of total revenue provided by properties	18.80%
Rental Income
Commitment And Contingencies [Line Items]
Percentage of total revenue provided by properties	8.80%
Number of tenants that comprise 9.7% of total annualized based rent | Customer	3
Total Revenues | Retail industry
Commitment And Contingencies [Line Items]
Percentage of total revenue provided by properties	31.90%	33.00%
Total Revenues | Office industry
Commitment And Contingencies [Line Items]
Percentage of total revenue provided by properties	34.00%	33.60%
Base Rent | salesforce.com, inc.
Commitment And Contingencies [Line Items]
Percentage of total revenue provided by properties	8.20%
Alamo Quarry Market and Waikele Center | Total Revenue
Commitment And Contingencies [Line Items]
Percentage of total revenue provided by properties	11.70%	13.20%
Maximum | Tenants
Commitment And Contingencies [Line Items]
Percentage of total revenue provided by properties	2.00%
Maximum | Del Monte Center | Ground Water Contamination
Commitment And Contingencies [Line Items]
Environmental remediation monitoring period	7 years
Minimum | Del Monte Center | Ground Water Contamination
Commitment And Contingencies [Line Items]
Environmental remediation monitoring period	5 years
The Land Mark at One Market
Commitment And Contingencies [Line Items]
Number of lease extension options | OptionPlan	2
Years, lease extension options length	5 years
Waikiki Beach Walk - Retail
Commitment And Contingencies [Line Items]
Property management fee, percent	3.00%
Outrigger Hotels
Commitment And Contingencies [Line Items]
Property management fee, percent	6.00%
Number of calendar months termination fee is based	2 months
Maximum percentage of hotel's fiscal year gross revenues paid for aggregate yearly management fee	3.50%
Previous months of management fees	12 months
Hotel management agreement default penalty factor of previous twelve months of management fees in first 11 years of term	8
Years in hotel management agreement term	11 years
Hotel management agreement default penalty factor of previous twelve months of management fees in twelfth year of term	4
Hotel management agreement default penalty factor of previous twelve months of management fees in thirteenth year of term	3
Hotel management agreement default penalty factor of previous twelve months of management fees in fourteenth year of term	2
Hotel management agreement default penalty factor of previous twelve months of management fees in fifteenth year of term	1
Outrigger Hotels | Year of Agreement, 12th
Commitment And Contingencies [Line Items]
Years in hotel management agreement term	15 years
Outrigger Hotels | Year of Agreement, 13th
Commitment And Contingencies [Line Items]
Years in hotel management agreement term	14 years
Outrigger Hotels | Year of Agreement, 14th
Commitment And Contingencies [Line Items]
Years in hotel management agreement term	13 years
Outrigger Hotels | Year of Agreement, 15th
Commitment And Contingencies [Line Items]
Years in hotel management agreement term	12 years
Outrigger Hotels | Maximum
Commitment And Contingencies [Line Items]
Property management fee, percent	3.00%
Wbw Hotel Lessee Llc
Commitment And Contingencies [Line Items]
Years of contract	20 years
Percentage of hotel occupancy gross revenue paid for program fee	4.00%
Wbw Hotel Lessee Llc | Future Time Period Prior to 12-31-2021
Commitment And Contingencies [Line Items]
Percentage of hotel occupancy gross revenue paid for franchise royalty fee	4.00%
Wbw Hotel Lessee Llc | Future Time Period After 12-31-2021
Commitment And Contingencies [Line Items]
Percentage of hotel occupancy gross revenue paid for franchise royalty fee	5.00%

Commitments and Contingencies C

Commitments and Contingencies Current Minimum Annual Payments under Leases (Details) - USD ($)	Jun. 30, 2021	Dec. 31, 2018
Operating Leased Assets [Line Items]
2,019		$ 3,347,000
2,020		3,422,000
2,021		2,153,000
2,022		0
2,023		0
Thereafter		0
Total		$ 8,922,000
Scenario, Forecast | The Land Mark at One Market
Operating Leased Assets [Line Items]
Stated monthly lease rate	$ 217,744

Operating Leases (Details)

Operating Leases (Details)	12 Months Ended
	Dec. 31, 2018StatePropertymo
Operating Leased Assets [Line Items]
Number of states where retail, office and mixed-use properties are located | State	5
Number of office, retail, and multifamily operating leases	27
Years, minimum term range of office and retail leases	3 years
Years, maximum term range of office and retail leases	10 years
Months, minimum term of apartment leases	7 months
Months, maximum term of apartment leases	15 months
Future minimum rentals term, maximum | mo	12
Retail Or Office
Operating Leased Assets [Line Items]
Number of office, retail, and multifamily operating leases	811
Residential Property
Operating Leased Assets [Line Items]
Number of office, retail, and multifamily operating leases	1,866

Operating Leases Minimum Future

Operating Leases Minimum Future Rentals from Noncancelable Operating Leases (Details) $ in Thousands	Dec. 31, 2018USD ($)
Leases, Operating [Abstract]
2,019	$ 177,144
2,020	172,821
2,021	157,611
2,022	138,787
2,023	116,985
Thereafter	412,934
Total	$ 1,176,282

Component of Rental Income an_3

Component of Rental Income and Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Leases, Income Statement, Lease Revenue [Abstract]
Recognition of straight-line rents	$ (2.4)	$ (0.8)	$ (0.8)
Recognition of amortization of above and below market leases	$ 3.6	$ 3.3	$ 3.5

Component of Rental Income an_4

Component of Rental Income and Expense Components of Rental Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Rental Income [Line Items]
Cost reimbursement	$ 34,584	$ 34,267	$ 33,610
Percentage rent	3,149	3,214	3,096
Hotel revenue	40,049	39,545	39,371
Other	1,611	1,667	1,512
Total rental income	309,537	298,803	279,498
Total Retail
Rental Income [Line Items]
Minimum rents	77,147	76,201	74,050
Total Office
Rental Income [Line Items]
Minimum rents	95,081	93,128	90,281
Total Multifamily
Rental Income [Line Items]
Minimum rents	46,897	40,217	26,962
Total Mixed-Use
Rental Income [Line Items]
Minimum rents	$ 11,019	$ 10,564	$ 10,616

Component of Rental Income an_5

Component of Rental Income and Expense Components of Rental Expenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Leases, Income Statement, Lease Revenue [Abstract]
Rental operating	$ 37,322	$ 34,944	$ 31,709
Hotel operating	24,030	24,254	23,607
Repairs and maintenance	13,486	13,136	12,705
Marketing	2,108	2,053	2,117
Rent	3,216	3,119	2,925
Hawaii excise tax	4,333	4,454	4,511
Management fees	1,987	2,046	1,979
Total rental expenses	$ 86,482	$ 84,006	$ 79,553

Other Income (Expenses) (Detail

Other Income (Expenses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other Income and Expenses [Abstract]
Interest and investment income	$ 238	$ 548	$ 72
Income tax expense	(327)	(214)	(566)
Other non-operating income	4	0	126
Total other income (expense)	$ (85)	$ 334	$ (368)

Related Party Transactions (Det

Related Party Transactions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jul. 01, 2017	Jul. 01, 2016	Jul. 01, 2015	Jul. 01, 2014
Related Party Transaction [Line Items]
Total rental income	$ 309,537	$ 298,803	$ 279,498
Investment in WBW CHP LLC, in percentage	47.70%
WBW CHP LLC
Related Party Transaction [Line Items]
Recovered reimbursements of operating expenses of WBW CHP LLC	$ 1,100	$ 1,000	$ 900
Common Stock
Related Party Transaction [Line Items]
Common shares issued (in shares)		700,000	219,480
Insurance Company of the West, Inc. | Board of Directors Chairman
Related Party Transaction [Line Items]
Total rental income	$ 100	$ 100	$ 2,200
Prepaid insurance				$ 200	$ 200	$ 200	$ 400
Percentage of ownership interests classified as noncontrolling	37.00%
Insurance Company of the West, Inc. | Common Stock | Board of Directors Chairman
Related Party Transaction [Line Items]
Percentage of ownership interests classified as noncontrolling	14.00%
Insurance Company of the West, Inc. | Member Units | Board of Directors Chairman
Related Party Transaction [Line Items]
Percentage of ownership interests classified as noncontrolling	23.10%
American Assets, Inc. | Board of Directors Chairman
Related Party Transaction [Line Items]
Total rental income	$ 100
EDisability, LLC | Board of Directors Chairman
Related Party Transaction [Line Items]
Total rental income	100
AAI Aviation, Inc. | Board of Directors Chairman
Related Party Transaction [Line Items]
Aviation expense	$ 100	$ 100	$ 200

Segment Reporting (Details)

Segment Reporting (Details)	12 Months Ended
	Dec. 31, 2018SegmentRoom
Segment Reporting [Abstract]
Number of operating segments | Segment	4
Rooms in mixed-use segment all-suite hotel | Room	369

Segment Reporting Operating Act

Segment Reporting Operating Activity Within Reportable Segments (Detail) - USD ($) $ in Thousands	3 Months Ended								8 Months Ended	12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Operating income (loss)	$ 22,091	$ 27,275	$ 17,249	$ 12,920	$ 23,792	$ 26,477	$ 20,048	$ 23,329	$ (3,670)	$ 79,535	$ 93,646	$ 97,941
Total segments' profit										209,412	198,306	187,157
Total Retail
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax										105,552	103,968	100,982
Property expense										(30,078)	(28,524)	(27,934)
Operating income (loss)										75,474	75,444	73,048
Total Office
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax										112,362	105,694	103,254
Property expense										(33,860)	(33,120)	(31,839)
Operating income (loss)										78,502	72,574	71,415
Total Multifamily
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax										50,627	43,533	29,188
Property expense										(20,441)	(17,898)	(12,498)
Operating income (loss)										30,186	25,635	16,690
Total Mixed-Use
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax										62,326	61,788	61,664
Property expense										(37,076)	(37,135)	(35,660)
Operating income (loss)										$ 25,250	$ 24,653	$ 26,004

Segment Reporting Reconciliatio

Segment Reporting Reconciliation of Segment Profit to Net Income Attributable to Stockholders (Details) - USD ($) $ in Thousands	3 Months Ended								8 Months Ended	12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting [Abstract]
Total segments' profit										$ 209,412	$ 198,306	$ 187,157
General and administrative										(22,784)	(21,382)	(17,897)
Depreciation and amortization										(107,093)	(83,278)	(71,319)
Interest expense										52,248	53,848	51,936
Other income (expense), net										(85)	334	(368)
Net income	$ 9,209	$ 14,271	$ 4,413	$ (691)	$ 9,731	$ 12,505	$ 7,588	$ 10,308	$ (3,670)	27,202	40,132	45,637
Net income attributable to restricted shares	(96)	(71)	(216)	72	(60)	(60)	(61)	(60)		(311)	(241)	(189)
Net income attributable to unitholders in the Operating Partnership	(2,440)	(3,806)	(1,125)	166	(2,594)	(3,351)	(2,008)	(2,861)		(7,205)	(10,814)	(12,863)
Net income attributable to American Assets Trust, Inc. stockholders	$ 6,673	$ 10,394	$ 3,072	$ (453)	$ 7,077	$ 9,094	$ 5,519	$ 7,387		$ 19,686	$ 29,077	$ 32,585

Segment Reporting Net Real Esta

Segment Reporting Net Real Estate and Secured Note Payable Balances for Each Segment (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Net Real Estate		$ 2,039,853	$ 2,076,707
Secured Notes Payable	[1]	182,765	279,889
Capital Expenditures and Leasing Commissions	[2]	64,347	52,423
Total Retail
Segment Reporting Information [Line Items]
Net Real Estate		628,734	658,654
Secured Notes Payable		35,008	35,737
Capital Expenditures and Leasing Commissions		14,219	10,412
Total Office
Segment Reporting Information [Line Items]
Net Real Estate		822,574	813,121
Secured Notes Payable		147,757	170,408
Capital Expenditures and Leasing Commissions		45,192	35,023
Total Multifamily
Segment Reporting Information [Line Items]
Net Real Estate		412,042	424,044
Secured Notes Payable		0	73,744
Capital Expenditures and Leasing Commissions		3,659	6,318
Total Mixed-Use
Segment Reporting Information [Line Items]
Net Real Estate		176,503	180,888
Secured Notes Payable		0	0
Capital Expenditures and Leasing Commissions		1,277	670
American Assets Trust, L.P.
Segment Reporting Information [Line Items]
Net Real Estate		2,039,853	2,076,707
Secured notes payable | American Assets Trust, L.P.
Segment Reporting Information [Line Items]
Debt Issuance Costs, Net		$ 193	$ 339
[1]	Excludes unamortized debt issuance costs of $0.2 million and $0.3 million as of December 31, 2018 and 2017, respectively.
[2]	Capital expenditures represent cash paid for capital expenditures during the year and includes leasing commissions paid.

Quarterly Financial Informati_3

Quarterly Financial Information (Unaudited) Selected Quarterly Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								8 Months Ended	12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information [Line Items]
Total revenue	$ 82,605	$ 82,507	$ 85,023	$ 80,732	$ 81,746	$ 82,339	$ 77,106	$ 73,792	$ 12,650	$ 330,867	$ 314,983	$ 295,088
Operating income (loss)	22,091	27,275	17,249	12,920	23,792	26,477	20,048	23,329	(3,670)	79,535	93,646	97,941
Net income	9,209	14,271	4,413	(691)	9,731	12,505	7,588	10,308	$ (3,670)	27,202	40,132	45,637
Net income attributable to restricted shares	(96)	(71)	(216)	72	(60)	(60)	(61)	(60)		(311)	(241)	(189)
Net income attributable to unitholders in the Operating Partnership	(2,440)	(3,806)	(1,125)	166	(2,594)	(3,351)	(2,008)	(2,861)		(7,205)	(10,814)	(12,863)
Net income attributable to American Assets Trust, Inc. stockholders	$ 6,673	$ 10,394	$ 3,072	$ (453)	$ 7,077	$ 9,094	$ 5,519	$ 7,387		19,686	29,077	32,585
Net income attributable to common stockholders - basic and diluted (in dollars per share)	$ 0.14	$ 0.22	$ 0.07	$ (0.01)	$ 0.15	$ 0.19	$ 0.12	$ 0.16
American Assets Trust, L.P.
Quarterly Financial Information [Line Items]
Total revenue	$ 82,605	$ 82,507	$ 85,023	$ 80,732	$ 81,746	$ 82,339	$ 77,106	$ 73,792		330,867	314,983	295,088
Operating income (loss)	22,091	27,275	17,249	12,920	23,792	26,477	20,048	23,329		79,535	93,646	97,941
Net income	9,209	14,271	4,413	(691)	9,731	12,505	7,588	10,308		27,202	40,132	45,637
Net income attributable to restricted shares	(96)	(71)	(216)	72	(60)	(60)	(61)	(60)		(311)	(241)	(189)
Net income attributable to American Assets Trust, Inc. stockholders										$ 26,891	$ 39,891	$ 45,448
Net income attributable to American Assets Trust, L.P. unit holders	$ 9,113	$ 14,200	$ 4,197	$ (619)	$ 9,671	$ 12,445	$ 7,527	$ 10,248
Net income attributable to common stockholders - basic and diluted (in dollars per share)	$ 0.14	$ 0.22	$ 0.07	$ (0.01)	$ 0.15	$ 0.19	$ 0.12	$ 0.16

Subsequent Events (Details)

Subsequent Events (Details) - Subsequent Event $ in Millions	Jan. 23, 2019USD ($)	Jan. 09, 2019Extension_Option
Subsequent Event [Line Items]
Lease termination fee | $	$ 4.4
Unsecured debt | American Assets Trust, L.P. | Term Loan A
Subsequent Event [Line Items]
Number of extensions available | Extension_Option		3
Extension term (in months)		1 year
LIBOR | Unsecured debt | American Assets Trust, L.P. | Term Loan A
Subsequent Event [Line Items]
Variable rate basis		LIBOR
Base Rate | Unsecured debt | American Assets Trust, L.P. | Term Loan A
Subsequent Event [Line Items]
Prime rate		prime rate
Federal funds rate		federal funds rate
Eurodollar		Eurodollar
Federal Funds Rate | Unsecured debt | Term Loan A
Subsequent Event [Line Items]
Basis spread on federal funds rate		0.50%
Eurodollar | Unsecured debt | Term Loan A
Subsequent Event [Line Items]
Basis spread on Eurodollar rate		1.00%
Minimum | LIBOR | Unsecured debt | American Assets Trust, L.P. | Term Loan A
Subsequent Event [Line Items]
Basis spread on variable rate (in percents)		1.20%
Minimum | Base Rate | American Assets Trust, L.P. | Term Loan A
Subsequent Event [Line Items]
Basis spread on variable rate (in percents)		0.20%
Maximum | LIBOR | Unsecured debt | American Assets Trust, L.P. | Term Loan A
Subsequent Event [Line Items]
Basis spread on variable rate (in percents)		1.70%
Maximum | Base Rate | American Assets Trust, L.P. | Term Loan A
Subsequent Event [Line Items]
Basis spread on variable rate (in percents)		0.70%

SCHEDULE III-Consolidated Rea_2

SCHEDULE III-Consolidated Real Estate and Accumulated Depreciation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2018	$ 182,765
Initial Cost, Land	518,672
Initial Cost, Building and Improvements	1,391,485
Cost Capitalized Subsequent to Acquisition	720,034
Gross Carrying Amount, Land	555,630
Gross Carrying Amount, Building and Improvements	2,074,561
Accumulated Depreciation and Amortization	(590,338)	$ (537,431)	$ (469,460)	$ (411,166)
The aggregate tax basis for Federal tax purposes	1,900,000
Alamo Quarry Market
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2018	0
Initial Cost, Land	26,396
Initial Cost, Building and Improvements	109,294
Cost Capitalized Subsequent to Acquisition	17,370
Gross Carrying Amount, Land	26,816
Gross Carrying Amount, Building and Improvements	126,244
Accumulated Depreciation and Amortization	$ (57,885)
Year Built/ Renovated	1997/1999
Date Acquired	Dec. 9, 2003
Life on which depreciation in latest income statements is computed	35 years
Carmel Country Plaza
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2018	$ 0
Initial Cost, Land	4,200
Initial Cost, Building and Improvements	0
Cost Capitalized Subsequent to Acquisition	12,806
Gross Carrying Amount, Land	4,200
Gross Carrying Amount, Building and Improvements	12,806
Accumulated Depreciation and Amortization	$ (8,251)
Year Built/ Renovated	1,991
Date Acquired	Jan. 10, 1989
Life on which depreciation in latest income statements is computed	35 years
Carmel Mountain Plaza
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2018	$ 0
Initial Cost, Land	22,477
Initial Cost, Building and Improvements	65,217
Cost Capitalized Subsequent to Acquisition	29,434
Gross Carrying Amount, Land	31,035
Gross Carrying Amount, Building and Improvements	86,093
Accumulated Depreciation and Amortization	$ (41,264)
Year Built/ Renovated	1994/2014
Date Acquired	Mar. 28, 2003
Life on which depreciation in latest income statements is computed	35 years
Del Monte Center
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2018	$ 0
Initial Cost, Land	27,412
Initial Cost, Building and Improvements	87,570
Cost Capitalized Subsequent to Acquisition	32,894
Gross Carrying Amount, Land	27,117
Gross Carrying Amount, Building and Improvements	120,759
Accumulated Depreciation and Amortization	$ (62,170)
Year Built/ Renovated	1967/1984/2006
Date Acquired	Apr. 8, 2004
Life on which depreciation in latest income statements is computed	35 years
Gateway Marketplace
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2018	$ 0
Initial Cost, Land	17,363
Initial Cost, Building and Improvements	21,644
Cost Capitalized Subsequent to Acquisition	1,097
Gross Carrying Amount, Land	17,363
Gross Carrying Amount, Building and Improvements	22,741
Accumulated Depreciation and Amortization	$ (1,199)
Year Built/ Renovated	1997/2016
Date Acquired	Jul. 6, 2017
Life on which depreciation in latest income statements is computed	35 years
Geary Marketplace
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2018	$ 0
Initial Cost, Land	8,239
Initial Cost, Building and Improvements	12,353
Cost Capitalized Subsequent to Acquisition	167
Gross Carrying Amount, Land	8,238
Gross Carrying Amount, Building and Improvements	12,521
Accumulated Depreciation and Amortization	$ (2,396)
Year Built/ Renovated	2,012
Date Acquired	Dec. 19, 2012
Life on which depreciation in latest income statements is computed	35 years
Hassalo on Eighth - Retail
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2018	$ 0
Initial Cost, Land	0
Initial Cost, Building and Improvements	0
Cost Capitalized Subsequent to Acquisition	28,364
Gross Carrying Amount, Land	597
Gross Carrying Amount, Building and Improvements	27,767
Accumulated Depreciation and Amortization	$ (3,668)
Year Built/ Renovated	2,015
Date Acquired	Jul. 1, 2011
Life on which depreciation in latest income statements is computed	35 years
Lomas Santa Fe Plaza
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2018	$ 0
Initial Cost, Land	8,600
Initial Cost, Building and Improvements	11,282
Cost Capitalized Subsequent to Acquisition	13,421
Gross Carrying Amount, Land	8,620
Gross Carrying Amount, Building and Improvements	24,683
Accumulated Depreciation and Amortization	$ (16,348)
Year Built/ Renovated	1972/1997
Date Acquired	Jun. 12, 1995
Life on which depreciation in latest income statements is computed	35 years
The Shops at Kalakaua
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2018	$ 0
Initial Cost, Land	13,993
Initial Cost, Building and Improvements	10,817
Cost Capitalized Subsequent to Acquisition	(6)
Gross Carrying Amount, Land	14,006
Gross Carrying Amount, Building and Improvements	10,798
Accumulated Depreciation and Amortization	$ (4,366)
Year Built/ Renovated	1971/2006
Date Acquired	Mar. 31, 2005
Life on which depreciation in latest income statements is computed	35 years
Solana Beach Towne Centre
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2018	$ 35,008
Initial Cost, Land	40,980
Initial Cost, Building and Improvements	38,842
Cost Capitalized Subsequent to Acquisition	3,158
Gross Carrying Amount, Land	40,980
Gross Carrying Amount, Building and Improvements	42,000
Accumulated Depreciation and Amortization	$ (10,827)
Year Built/ Renovated	1973/2000/2004
Date Acquired	Jan. 19, 2011
Life on which depreciation in latest income statements is computed	35 years
South Bay Marketplace
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2018	$ 0
Initial Cost, Land	4,401
Initial Cost, Building and Improvements	0
Cost Capitalized Subsequent to Acquisition	11,931
Gross Carrying Amount, Land	4,401
Gross Carrying Amount, Building and Improvements	11,931
Accumulated Depreciation and Amortization	$ (7,311)
Year Built/ Renovated	1,997
Date Acquired	Sep. 16, 1995
Life on which depreciation in latest income statements is computed	35 years
Waikele Center
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2018	$ 0
Initial Cost, Land	55,593
Initial Cost, Building and Improvements	126,858
Cost Capitalized Subsequent to Acquisition	29,202
Gross Carrying Amount, Land	70,643
Gross Carrying Amount, Building and Improvements	141,010
Accumulated Depreciation and Amortization	$ (57,608)
Year Built/ Renovated	1993/2008
Date Acquired	Sep. 16, 2004
Life on which depreciation in latest income statements is computed	35 years
City Center Bellevue
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2018	$ 111,000
Initial Cost, Land	25,135
Initial Cost, Building and Improvements	190,998
Cost Capitalized Subsequent to Acquisition	36,074
Gross Carrying Amount, Land	25,135
Gross Carrying Amount, Building and Improvements	227,072
Accumulated Depreciation and Amortization	$ (43,740)
Year Built/ Renovated	1,987
Date Acquired	Aug. 21, 2012
Life on which depreciation in latest income statements is computed	40 years
First & Main
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2018	$ 0
Initial Cost, Land	14,697
Initial Cost, Building and Improvements	109,739
Cost Capitalized Subsequent to Acquisition	7,690
Gross Carrying Amount, Land	14,697
Gross Carrying Amount, Building and Improvements	117,429
Accumulated Depreciation and Amortization	$ (28,457)
Year Built/ Renovated	2,010
Date Acquired	Mar. 11, 2011
Life on which depreciation in latest income statements is computed	40 years
The Land Mark at One Market
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2018	$ 0
Initial Cost, Land	34,575
Initial Cost, Building and Improvements	141,196
Cost Capitalized Subsequent to Acquisition	6,800
Gross Carrying Amount, Land	34,575
Gross Carrying Amount, Building and Improvements	147,996
Accumulated Depreciation and Amortization	$ (37,857)
Year Built/ Renovated	1917/2000
Date Acquired	Jun. 30, 2010
Life on which depreciation in latest income statements is computed	40 years
Lloyd District Portfolio
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2018	$ 0
Initial Cost, Land	18,660
Initial Cost, Building and Improvements	61,401
Cost Capitalized Subsequent to Acquisition	69,444
Gross Carrying Amount, Land	11,845
Gross Carrying Amount, Building and Improvements	137,660
Accumulated Depreciation and Amortization	$ (28,415)
Year Built/ Renovated	1940-2015
Date Acquired	Jul. 1, 2011
Life on which depreciation in latest income statements is computed	40 years
One Beach Street
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2018	$ 0
Initial Cost, Land	15,332
Initial Cost, Building and Improvements	18,017
Cost Capitalized Subsequent to Acquisition	2,723
Gross Carrying Amount, Land	15,332
Gross Carrying Amount, Building and Improvements	20,740
Accumulated Depreciation and Amortization	$ (4,965)
Year Built/ Renovated	1924/1972/1987/1992
Date Acquired	Jan. 24, 2012
Life on which depreciation in latest income statements is computed	40 years
Solana Beach Corporate Centre I-II
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2018	$ 10,502
Initial Cost, Land	7,111
Initial Cost, Building and Improvements	17,100
Cost Capitalized Subsequent to Acquisition	6,076
Gross Carrying Amount, Land	7,111
Gross Carrying Amount, Building and Improvements	23,176
Accumulated Depreciation and Amortization	$ (5,563)
Year Built/ Renovated	1982/2005
Date Acquired	Jan. 19, 2011
Life on which depreciation in latest income statements is computed	40 years
Solana Beach Corporate Centre III-IV
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2018	$ 0
Initial Cost, Land	7,298
Initial Cost, Building and Improvements	27,887
Cost Capitalized Subsequent to Acquisition	3,199
Gross Carrying Amount, Land	7,298
Gross Carrying Amount, Building and Improvements	31,086
Accumulated Depreciation and Amortization	$ (7,516)
Year Built/ Renovated	1982/2005
Date Acquired	Jan. 19, 2011
Life on which depreciation in latest income statements is computed	40 years
Solana Beach Corporate Centre Land
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2018	$ 0
Initial Cost, Land	487
Initial Cost, Building and Improvements	0
Cost Capitalized Subsequent to Acquisition	60
Gross Carrying Amount, Land	547
Gross Carrying Amount, Building and Improvements	0
Accumulated Depreciation and Amortization	$ 0
Year Built/ Renovated	N/A
Date Acquired	Jan. 19, 2011
Torrey Plaza
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2018	$ 0
Initial Cost, Land	4,095
Initial Cost, Building and Improvements	0
Cost Capitalized Subsequent to Acquisition	49,281
Gross Carrying Amount, Land	5,408
Gross Carrying Amount, Building and Improvements	47,968
Accumulated Depreciation and Amortization	$ (16,524)
Year Built/ Renovated	1996-1997/2014
Date Acquired	Jun. 6, 1989
Life on which depreciation in latest income statements is computed	40 years
Pacific North Court
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2018	$ 19,620
Initial Cost, Land	3,263
Initial Cost, Building and Improvements	0
Cost Capitalized Subsequent to Acquisition	24,116
Gross Carrying Amount, Land	4,309
Gross Carrying Amount, Building and Improvements	23,070
Accumulated Depreciation and Amortization	$ (11,740)
Year Built/ Renovated	1997-1998
Date Acquired	Jun. 6, 1989
Life on which depreciation in latest income statements is computed	40 years
Pacific South Court
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2018	$ 0
Initial Cost, Land	3,285
Initial Cost, Building and Improvements	0
Cost Capitalized Subsequent to Acquisition	37,800
Gross Carrying Amount, Land	4,226
Gross Carrying Amount, Building and Improvements	36,859
Accumulated Depreciation and Amortization	$ (13,105)
Year Built/ Renovated	1996-1997
Date Acquired	Jun. 6, 1989
Life on which depreciation in latest income statements is computed	40 years
Pacific VC
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2018	$ 6,635
Initial Cost, Land	1,413
Initial Cost, Building and Improvements	0
Cost Capitalized Subsequent to Acquisition	9,736
Gross Carrying Amount, Land	2,148
Gross Carrying Amount, Building and Improvements	9,001
Accumulated Depreciation and Amortization	$ (4,901)
Year Built/ Renovated	1998/2000
Date Acquired	Jun. 6, 1989
Life on which depreciation in latest income statements is computed	40 years
Pacific Torrey Daycare
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2018	$ 0
Initial Cost, Land	715
Initial Cost, Building and Improvements	0
Cost Capitalized Subsequent to Acquisition	1,843
Gross Carrying Amount, Land	911
Gross Carrying Amount, Building and Improvements	1,647
Accumulated Depreciation and Amortization	$ (902)
Year Built/ Renovated	1996-1997
Date Acquired	Jun. 6, 1989
Life on which depreciation in latest income statements is computed	40 years
Torrey Reserve Building 6
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2018	$ 0
Initial Cost, Land	0
Initial Cost, Building and Improvements	0
Cost Capitalized Subsequent to Acquisition	7,992
Gross Carrying Amount, Land	682
Gross Carrying Amount, Building and Improvements	7,310
Accumulated Depreciation and Amortization	$ (1,485)
Year Built/ Renovated	2,013
Date Acquired	Jun. 6, 1989
Life on which depreciation in latest income statements is computed	40 years
Torrey Reserve Building 5
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2018	$ 0
Initial Cost, Land	0
Initial Cost, Building and Improvements	0
Cost Capitalized Subsequent to Acquisition	3,937
Gross Carrying Amount, Land	1,017
Gross Carrying Amount, Building and Improvements	2,920
Accumulated Depreciation and Amortization	$ (214)
Year Built/ Renovated	2,014
Date Acquired	Jun. 6, 1989
Life on which depreciation in latest income statements is computed	40 years
Torrey Reserve Building 13 & 14
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2018	$ 0
Initial Cost, Land	0
Initial Cost, Building and Improvements	0
Cost Capitalized Subsequent to Acquisition	15,587
Gross Carrying Amount, Land	2,188
Gross Carrying Amount, Building and Improvements	13,399
Accumulated Depreciation and Amortization	$ (1,207)
Year Built/ Renovated	2,015
Date Acquired	Jun. 6, 1989
Life on which depreciation in latest income statements is computed	40 years
Torrey Point
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2018	$ 0
Initial Cost, Land	2,073
Initial Cost, Building and Improvements	741
Cost Capitalized Subsequent to Acquisition	41,985
Gross Carrying Amount, Land	6,037
Gross Carrying Amount, Building and Improvements	38,762
Accumulated Depreciation and Amortization	$ (395)
Year Built/ Renovated	2,018
Date Acquired	May 9, 1997
Life on which depreciation in latest income statements is computed	40 years
Imperial Beach Gardens
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2018	$ 0
Initial Cost, Land	1,281
Initial Cost, Building and Improvements	4,820
Cost Capitalized Subsequent to Acquisition	4,894
Gross Carrying Amount, Land	1,281
Gross Carrying Amount, Building and Improvements	9,714
Accumulated Depreciation and Amortization	$ (8,054)
Year Built/ Renovated	1959/2008
Date Acquired	Jul. 31, 1985
Life on which depreciation in latest income statements is computed	30 years
Loma Palisades
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2018	$ 0
Initial Cost, Land	14,000
Initial Cost, Building and Improvements	16,570
Cost Capitalized Subsequent to Acquisition	25,982
Gross Carrying Amount, Land	14,051
Gross Carrying Amount, Building and Improvements	42,501
Accumulated Depreciation and Amortization	$ (27,988)
Year Built/ Renovated	1958/2001-2008
Date Acquired	Jul. 20, 1990
Life on which depreciation in latest income statements is computed	30 years
Mariner's Point
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2018	$ 0
Initial Cost, Land	2,744
Initial Cost, Building and Improvements	4,540
Cost Capitalized Subsequent to Acquisition	1,553
Gross Carrying Amount, Land	2,744
Gross Carrying Amount, Building and Improvements	6,093
Accumulated Depreciation and Amortization	$ (3,430)
Year Built/ Renovated	1,986
Date Acquired	May 9, 2001
Life on which depreciation in latest income statements is computed	30 years
Santa Fe Park Rv Resort
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2018	$ 0
Initial Cost, Land	401
Initial Cost, Building and Improvements	928
Cost Capitalized Subsequent to Acquisition	841
Gross Carrying Amount, Land	401
Gross Carrying Amount, Building and Improvements	1,769
Accumulated Depreciation and Amortization	$ (1,483)
Year Built/ Renovated	1971/2007-2008
Date Acquired	Jun. 1, 1979
Life on which depreciation in latest income statements is computed	30 years
Pacific Ridge Apartments
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2018	$ 0
Initial Cost, Land	47,971
Initial Cost, Building and Improvements	178,497
Cost Capitalized Subsequent to Acquisition	1,094
Gross Carrying Amount, Land	47,971
Gross Carrying Amount, Building and Improvements	179,591
Accumulated Depreciation and Amortization	$ (11,329)
Year Built/ Renovated	2,013
Date Acquired	Apr. 28, 2017
Life on which depreciation in latest income statements is computed	30 years
Hassalo on Eighth - Residential
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2018	$ 0
Initial Cost, Land	0
Initial Cost, Building and Improvements	0
Cost Capitalized Subsequent to Acquisition	177,859
Gross Carrying Amount, Land	6,220
Gross Carrying Amount, Building and Improvements	171,639
Accumulated Depreciation and Amortization	$ (19,649)
Year Built/ Renovated	2,015
Date Acquired	Jul. 1, 2011
Life on which depreciation in latest income statements is computed	30 years
Waikiki Beach Walk - Retail
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2018	$ 0
Initial Cost, Land	45,995
Initial Cost, Building and Improvements	74,943
Cost Capitalized Subsequent to Acquisition	430
Gross Carrying Amount, Land	45,995
Gross Carrying Amount, Building and Improvements	75,373
Accumulated Depreciation and Amortization	$ (18,753)
Year Built/ Renovated	2,006
Date Acquired	Jan. 19, 2011
Life on which depreciation in latest income statements is computed	35 years
Waikiki Beach Walk Hotel
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2018	$ 0
Initial Cost, Land	30,640
Initial Cost, Building and Improvements	60,029
Cost Capitalized Subsequent to Acquisition	2,404
Gross Carrying Amount, Land	30,640
Gross Carrying Amount, Building and Improvements	62,433
Accumulated Depreciation and Amortization	$ (19,184)
Year Built/ Renovated	2008/2014
Date Acquired	Jan. 19, 2011
Life on which depreciation in latest income statements is computed	35 years
Solana Beach Highway 101 Land
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2018	$ 0
Initial Cost, Land	7,847
Initial Cost, Building and Improvements	202
Cost Capitalized Subsequent to Acquisition	796
Gross Carrying Amount, Land	8,845
Gross Carrying Amount, Building and Improvements	0
Accumulated Depreciation and Amortization	$ (189)
Year Built/ Renovated	N/A
Date Acquired	Sep. 20, 2011

SCHEDULE III-Consolidated Rea_3

SCHEDULE III-Consolidated Real Estate and Accumulated Depreciation Rollforward (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Real estate assets
Balance, beginning of period		$ 2,614,138	$ 2,301,006	$ 2,246,028
Property acquisitions		0	270,602	0
Improvements		62,790	44,755	59,199
Cost of Real Estate Sold		0	0	0
Other	[1]	(46,737)	(2,225)	(4,221)
Balance, end of period		2,630,191	2,614,138	2,301,006
Accumulated depreciation
Balance, beginning of period		537,431	469,460	411,166
Additions-depreciation		99,644	70,196	62,515
Cost of Real Estate Sold		0	0	0
Other	[1]	(46,737)	(2,225)	(4,221)
Balance, end of period		$ 590,338	$ 537,431	$ 469,460
[1]	Other deductions for the years ended December 31, 2018, 2017 and 2016 represent the write-off of fully depreciated assets.