American Assets Trust (AAT) 10-K 11 Feb 22 2021 FY Annual report Financial data

Cover Page

Cover Page - USD ($)	12 Months Ended
	Dec. 31, 2021	Feb. 11, 2022	Jun. 30, 2021
Document Information [Line Items]
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Trading Symbol	AAT
Entity Central Index Key	0001500217
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2021
Document Transition Report	false
Entity Registrant Name	AMERICAN ASSETS TRUST, INC.
Entity File Number	001-35030
Entity Incorporation, State or Country Code	MD
Entity Tax Identification Number	27-3338708
Entity Address, Address Line One	3420 Carmel Mountain Road
Entity Address, Address Line Two	Suite 100
Entity Address, City or Town	San Diego
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	92121
City Area Code	858
Local Phone Number	350-2600
Title of 12(b) Security	Common Stock, $.01 par value per share
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 1,971,000,000
Entity Common Stock, Shares Outstanding		60,523,831
American Assets Trust, L.P.
Document Information [Line Items]
Amendment Flag	false
Entity Central Index Key	0001509570
Document Type	10-K
Entity Registrant Name	AMERICAN ASSETS TRUST, L.P.
Entity File Number	33-202342-01
Entity Incorporation, State or Country Code	MD
Entity Tax Identification Number	27-3338894
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 0
Entity Common Stock, Shares Outstanding		0

Audit Information

Audit Information	12 Months Ended
	Dec. 31, 2021
Auditor [Line Items]
Auditor Name	Ernst & Young LLP
Auditor Firm ID	42
Auditor Location	San Diego, California
American Assets Trust, L.P.
Auditor [Line Items]
Auditor Name	Ernst & Young LLP
Auditor Firm ID	42
Auditor Location	San Diego, California

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
ASSETS
Operating real estate	$ 3,389,726	$ 3,155,280
Construction in progress	139,098	91,047
Held for development	547	547
Total Real estate, at cost	3,529,371	3,246,874
Accumulated depreciation	(847,390)	(754,140)
Net real estate	2,681,981	2,492,734
Cash and cash equivalents	139,524	137,333
Restricted cash	0	1,716
Accounts receivable, net	7,445	6,938
Deferred rent receivables, net	82,724	72,476
Other assets, net	106,253	106,112
TOTAL ASSETS	3,017,927	2,817,309
LIABILITIES AND EQUITY
Secured notes payable	110,965	110,923
Unsecured notes payable, net	1,538,238	1,196,677
Unsecured line of credit, net	0	99,151
Accounts payable and accrued expenses	64,531	59,262
Security deposits payable	7,855	6,590
Other liabilities and deferred credits	86,215	91,300
Total liabilities	1,807,804	1,563,903
Commitments and contingencies (Note 12)
Common stock, shares authorized	490,000,000	490,000,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares issued	60,525,580	60,476,292
Common stock, shares outstanding	60,525,580	60,476,292
American Assets Trust, Inc. stockholders' equity
Common stock, $0.01 par value, 490,000,000 shares authorized, 60,525,580 and 60,476,292 shares issued and outstanding at December 31, 2021 and December 31, 2020, respectively	$ 605	$ 605
Additional paid-in capital	1,453,272	1,445,644
Accumulated dividends in excess of net income	(217,785)	(176,560)
Accumulated other comprehensive income	2,872	1,753
Total American Assets Trust, Inc. stockholders' equity	1,238,964	1,271,442
Noncontrolling interests	(28,841)	(18,036)
Total equity	1,210,123	1,253,406
TOTAL LIABILITIES AND EQUITY	3,017,927	2,817,309
American Assets Trust, L.P.
ASSETS
Operating real estate	3,389,726	3,155,280
Construction in progress	139,098	91,047
Held for development	547	547
Total Real estate, at cost	3,529,371	3,246,874
Accumulated depreciation	(847,390)	(754,140)
Net real estate	2,681,981	2,492,734
Cash and cash equivalents	139,524	137,333
Restricted cash	0	1,716
Accounts receivable, net	7,445	6,938
Deferred rent receivables, net	82,724	72,476
Other assets, net	106,253	106,112
TOTAL ASSETS	3,017,927	2,817,309
LIABILITIES AND EQUITY
Secured notes payable	110,965	110,923
Unsecured notes payable, net	1,538,238	1,196,677
Unsecured line of credit, net	0	99,151
Accounts payable and accrued expenses	64,531	59,262
Security deposits payable	7,855	6,590
Other liabilities and deferred credits	86,215	91,300
Total liabilities	1,807,804	1,563,903
American Assets Trust, Inc. stockholders' equity
Accumulated other comprehensive income	4,169	2,737
TOTAL LIABILITIES AND EQUITY	3,017,927	2,817,309
Partners' Capital [Abstract]
Limited partners' capital, 16,181,537 and 16,181,537 units issued and outstanding as of December 31, 2021 and December 31, 2020, respectively	(30,138)	(19,020)
General partner's capital, 60,525,580 and 60,476,292 units issued and outstanding as of December 31, 2021 and December 31, 2020, respectively	1,236,092	1,269,689
Total capital	$ 1,210,123	$ 1,253,406

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2021	Dec. 31, 2020
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	60,525,580	60,476,292
Common stock, shares outstanding	60,525,580	60,476,292
American Assets Trust, L.P.
Limited Partners' Capital Account, Units Issued	16,181,537	16,181,537
Limited Partners' Capital Account, Units Outstanding	16,181,537	16,181,537
General Partners' Capital Account, Units Issued	60,525,580	60,476,292
General Partners' Capital Account, Units Outstanding	60,525,580	60,476,292

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
REVENUE:
Rental income		$ 360,208	$ 330,312	$ 343,865
Other property income		15,620	14,261	22,876
Total revenue		375,828	344,573	366,741
EXPENSES:
Rental expenses		86,980	79,178	91,967
Real estate taxes		42,794	41,941	40,013
General and administrative		29,879	26,581	24,871
Depreciation and amortization		116,306	108,292	96,205
Total operating expenses		275,959	255,992	253,056
Operating income (loss)		99,869	88,581	113,685
Interest expense		(58,587)	(53,440)	(54,008)
Loss on early extinguishment of debt		(4,271)	0	0
Gain on sale of real estate		0	0	633
Other (expense) income, net		(418)	447	(122)
Net income		36,593	35,588	60,188
Net income attributable to restricted shares		(564)	(383)	(381)
Net income attributable to unitholders in the Operating Partnership		(7,653)	(7,545)	(14,089)
NET INCOME ATTRIBUTABLE TO AMERICAN ASSETS TRUST, INC. STOCKHOLDERS		$ 28,376	$ 27,660	$ 45,718
EARNINGS PER COMMON SHARE, BASIC
Basic net income attributable to common stockholders per share (in dollars per share)		$ 0.47	$ 0.46	$ 0.84
Weighted average shares of common stock outstanding-basic (in shares)		59,990,740	59,806,309	54,110,949
EARNINGS PER COMMON SHARE, DILUTED
Diluted net income attributable to common stockholders per share (in dollars per share)		$ 0.47	$ 0.46	$ 0.84
Weighted average shares of common stock outstanding-diluted (in shares)		76,172,277	76,119,763	70,786,132
COMPREHENSIVE INCOME
Net income		$ 36,593	$ 35,588	$ 60,188
Other comprehensive gain (loss) - unrealized gain (loss) on swap derivatives during the period		2,723	(3,649)	(5,571)
Comprehensive income		38,025	30,609	53,313
Comprehensive income attributable to noncontrolling interest		(7,966)	(6,496)	(12,301)
Comprehensive income attributable to American Assets Trust, Inc.		30,059	24,113	41,012
Early Extinguishment of Debt
COMPREHENSIVE INCOME
Reclassification of amortization of forward starting swaps included in interest expense		(193)	0	0
Interest Expense
COMPREHENSIVE INCOME
Reclassification of amortization of forward starting swaps included in interest expense		(1,098)	(1,330)	(1,304)
American Assets Trust, L.P.
REVENUE:
Rental income		360,208	330,312	343,865
Other property income		15,620	14,261	22,876
Total revenue		375,828	344,573	366,741
EXPENSES:
Rental expenses		86,980	79,178	91,967
Real estate taxes		42,794	41,941	40,013
General and administrative		29,879	26,581	24,871
Depreciation and amortization		116,306	108,292	96,205
Total operating expenses		275,959	255,992	253,056
Operating income (loss)		99,869	88,581	113,685
Interest expense		(58,587)	(53,440)	(54,008)
Loss on early extinguishment of debt		(4,271)	0	0
Gain on sale of real estate		0	0	633
Other (expense) income, net		(418)	447	(122)
Net income		36,593	35,588	60,188
Net income attributable to restricted shares		(564)	(383)	(381)
NET INCOME ATTRIBUTABLE TO AMERICAN ASSETS TRUST, INC. STOCKHOLDERS		$ 36,029	$ 35,205	$ 59,807
EARNINGS PER COMMON SHARE, BASIC
Basic net income attributable to common stockholders per share (in dollars per share)		$ 0.47	$ 0.46	$ 0.84
Weighted average shares of common stock outstanding-basic (in shares)		76,172,277	76,119,763	70,786,132
EARNINGS PER COMMON SHARE, DILUTED
Diluted net income attributable to common stockholders per share (in dollars per share)		$ 0.47	$ 0.46	$ 0.84
Weighted average shares of common stock outstanding-diluted (in shares)		76,172,277	76,119,763	70,786,132
DISTRIBUTIONS PER UNIT (in dollars per share)		$ 1.16	$ 1	$ 1.14
COMPREHENSIVE INCOME
Net income		$ 36,593	$ 35,588	$ 60,188
Other comprehensive gain (loss) - unrealized gain (loss) on swap derivatives during the period		2,723	(3,649)	(5,571)
Comprehensive income		38,025	30,609	53,313
American Assets Trust, L.P. | Early Extinguishment of Debt
COMPREHENSIVE INCOME
Reclassification of amortization of forward starting swaps included in interest expense		(193)	0	0
American Assets Trust, L.P. | Early Extinguishment of Debt | Accumulated Other Comprehensive Income (Loss)
COMPREHENSIVE INCOME
Reclassification of amortization of forward starting swaps included in interest expense		(193)
American Assets Trust, L.P. | Interest Expense
COMPREHENSIVE INCOME
Reclassification of amortization of forward starting swaps included in interest expense		(1,098)	(1,330)	(1,304)
American Assets Trust, L.P. | Interest Expense | Accumulated Other Comprehensive Income (Loss)
COMPREHENSIVE INCOME
Reclassification of amortization of forward starting swaps included in interest expense		(1,098)	(1,330)	(1,304)
American Assets Trust, L.P. | Limited Partner
EXPENSES:
Net income	[1]	7,653	7,545	14,089
COMPREHENSIVE INCOME
Net income	[1]	7,653	7,545	14,089
Comprehensive income attributable to American Assets Trust, Inc.		(7,966)	(6,496)	(12,301)
American Assets Trust, L.P. | General Partner
EXPENSES:
Net income	[2]	28,940	28,043	46,099
COMPREHENSIVE INCOME
Net income	[2]	28,940	28,043	46,099
Comprehensive income attributable to American Assets Trust, Inc.		$ 30,059	$ 24,113	$ 41,012
[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	Swap	Forward Contracts	Early Extinguishment of Debt	Interest Expense	American Assets Trust, L.P.	American Assets Trust, L.P.Swap	American Assets Trust, L.P.Forward Contracts	American Assets Trust, L.P.Early Extinguishment of Debt	American Assets Trust, L.P.Interest Expense	Limited PartnerAmerican Assets Trust, L.P.	[1]	General PartnerAmerican Assets Trust, L.P.		Accumulated Other Comprehensive Income (Loss)American Assets Trust, L.P.	Accumulated Other Comprehensive Income (Loss)American Assets Trust, L.P.Swap	Accumulated Other Comprehensive Income (Loss)American Assets Trust, L.P.Forward Contracts	Accumulated Other Comprehensive Income (Loss)American Assets Trust, L.P.Early Extinguishment of Debt	Accumulated Other Comprehensive Income (Loss)American Assets Trust, L.P.Interest Expense	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	Accumulated Other Comprehensive Income (Loss)Early Extinguishment of Debt	Accumulated Other Comprehensive Income (Loss)Interest Expense	Noncontrolling Interests - Unitholders in the Operating Partnership	Noncontrolling Interests - Unitholders in the Operating PartnershipSwap	Noncontrolling Interests - Unitholders in the Operating PartnershipForward Contracts	Noncontrolling Interests - Unitholders in the Operating PartnershipEarly Extinguishment of Debt	Noncontrolling Interests - Unitholders in the Operating PartnershipInterest Expense
Beginning balance (in shares) at Dec. 31, 2018																					47,335,409
Beginning balance at Dec. 31, 2018		$ 802,471																			$ 474		$ 920,661	$ (128,778)	$ 10,620					$ (506)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		60,188					$ 60,188					$ 14,089		$ 46,099	[2]									46,099						14,089
Common shares issued (in shares)																					11,871,552
Common shares issued		515,354																			$ 118		515,236
Issuance of restricted stock (in shares)																					173,008
Issuance of restricted stock		0																			$ 2		(2)
Forfeiture of restricted stock (in shares)																					(70,641)
Forfeiture of restricted stock		0																			$ (1)		1
Conversion of operating partnership units (in shares)																					787,060	787,060
Conversion of operating partnership units		0																			$ 8		12,979		148					(13,135)
Dividends declared and paid		(80,605)																						(61,699)
Dividends declared and paid (noncontrolling interest)																														18,906
Stock-based compensation		4,477																					4,477
Shares withheld for employee taxes (in shares)														(28,160)	[2]						(28,160)
Shares withheld for employee taxes		(1,338)					(1,338)							$ (1,338)	[2]						$ 0		(1,338)
Other comprehensive gain (loss) - unrealized gain (loss) on swap derivatives during the period		(5,571)	$ (6,084)	$ 513			(5,571)	$ (6,084)	$ 513								$ (6,084)	$ 513								$ (4,482)	$ 392				$ (1,602)	$ 121
Reclassification of amortization of forward starting swaps included in interest expense					$ 0	$ (1,304)				$ 0	$ (1,304)									$ (1,304)									$ (998)					$ (306)
Ending balance (in shares) at Dec. 31, 2019																					60,068,228
Ending balance at Dec. 31, 2019		1,293,672																			$ 601		1,452,014	(144,378)	5,680					(20,245)
Beginning balance (in shares) at Dec. 31, 2018												17,177,608		47,335,409	[2]
Beginning balance at Dec. 31, 2018							802,471					$ (4,477)		$ 792,357	[2]	$ 14,591
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income		60,188					60,188					$ 14,089		$ 46,099	[2]									46,099						14,089
Contributions from American Assets Trust, Inc. (in shares)	[2]													11,871,552
Contributions from American Assets Trust, Inc.							515,354							$ 515,354	[2]
Conversion of operating partnership units (in shares)												(787,060)		787,060	[2]
Conversion of operating partnership units												$ (12,987)		$ 12,987	[2]
Issuance of restricted units (in shares)	[2]													173,008
Forfeiture of restricted units (in shares)	[2]													(70,641)
Distributions							(80,605)					$ (18,906)		$ (61,699)	[2]
Stock-based compensation							4,477							$ 4,477	[2]
Shares withheld for employee taxes (in shares)														(28,160)	[2]						(28,160)
Units withheld for employee taxes		(1,338)					(1,338)							$ (1,338)	[2]						$ 0		(1,338)
Other comprehensive gain (loss) - unrealized gain (loss) on swap derivatives during the period		(5,571)	(6,084)	$ 513			(5,571)	(6,084)	$ 513								(6,084)	$ 513								(4,482)	$ 392				(1,602)	$ 121
Reclassification of amortization of forward starting swaps included in interest expense					0	(1,304)				0	(1,304)									(1,304)									(998)					(306)
Ending balance (in shares) at Dec. 31, 2019												16,390,548		60,068,228	[2]
Ending balance at Dec. 31, 2019							1,293,672					$ (22,281)		$ 1,308,237	[2]	7,716
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		35,588					35,588					7,545		$ 28,043	[2]									28,043						7,545
Issuance of restricted stock (in shares)																					317,574
Issuance of restricted stock		0																			$ 3		(3)
Forfeiture of restricted stock (in shares)																					(95,086)
Forfeiture of restricted stock		0																			$ (1)		1
Conversion of operating partnership units (in shares)																					209,011	209,011
Conversion of operating partnership units		0																			$ 2		(12,003)		3					11,998
Dividends declared and paid		(76,510)																						(60,225)
Dividends declared and paid (noncontrolling interest)																														16,285
Stock-based compensation		6,307																					6,307
Shares withheld for employee taxes (in shares)														(23,435)	[2]						(23,435)
Shares withheld for employee taxes		(672)					(672)							$ (672)	[2]						$ 0		(672)
Other comprehensive gain (loss) - unrealized gain (loss) on swap derivatives during the period		(3,649)	(3,649)				(3,649)	(3,649)									(3,649)									(2,885)					(764)
Reclassification of amortization of forward starting swaps included in interest expense					0	(1,330)				0	(1,330)									(1,330)									(1,045)					(285)
Ending balance (in shares) at Dec. 31, 2020																					60,476,292
Ending balance at Dec. 31, 2020		1,253,406																			$ 605		1,445,644	(176,560)	1,753					(18,036)
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income		35,588					35,588					$ 7,545		$ 28,043	[2]									28,043						7,545
Conversion of operating partnership units (in shares)												(209,011)		209,011	[2]
Conversion of operating partnership units												$ 12,001		$ (12,001)	[2]
Issuance of restricted units (in shares)	[2]													317,574
Forfeiture of restricted units (in shares)	[2]													(95,086)
Distributions							(76,510)					$ (16,285)		$ (60,225)	[2]
Stock-based compensation							6,307							$ 6,307	[2]
Shares withheld for employee taxes (in shares)														(23,435)	[2]						(23,435)
Units withheld for employee taxes		(672)					(672)							$ (672)	[2]						$ 0		(672)
Other comprehensive gain (loss) - unrealized gain (loss) on swap derivatives during the period		(3,649)	(3,649)				(3,649)	(3,649)									(3,649)									(2,885)					(764)
Reclassification of amortization of forward starting swaps included in interest expense					0	(1,330)				0	(1,330)									(1,330)									(1,045)					(285)
Ending balance (in shares) at Dec. 31, 2020												16,181,537		60,476,292	[2]
Ending balance at Dec. 31, 2020							1,253,406					$ (19,020)		$ 1,269,689	[2]	2,737
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		36,593					36,593					7,653		$ 28,940	[2]									28,940						7,653
Issuance of restricted stock (in shares)																					229,819
Issuance of restricted stock		0																			$ 2		(2)
Forfeiture of restricted stock (in shares)																					(155,390)
Forfeiture of restricted stock		0																			$ (2)		2
Conversion of operating partnership units (in shares)																						0
Dividends declared and paid		(88,936)																						(70,165)
Dividends declared and paid (noncontrolling interest)																														18,771
Stock-based compensation		8,493																					8,493
Shares withheld for employee taxes (in shares)														(25,141)	[2]						(25,141)
Shares withheld for employee taxes		(865)					(865)							$ (865)	[2]						$ 0		(865)
Other comprehensive gain (loss) - unrealized gain (loss) on swap derivatives during the period		2,723	2,723				2,723	2,723									2,723									2,135					588
Reclassification of amortization of forward starting swaps included in interest expense					(193)	(1,098)				(193)	(1,098)								$ (193)	(1,098)								$ (152)	(864)				$ (41)	(234)
Ending balance (in shares) at Dec. 31, 2021																					60,525,580
Ending balance at Dec. 31, 2021		1,210,123																			$ 605		1,453,272	(217,785)	$ 2,872					(28,841)
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income		36,593					36,593					7,653		$ 28,940	[2]									$ 28,940						$ 7,653
Issuance of restricted units (in shares)	[2]													229,819
Forfeiture of restricted units (in shares)	[2]													(155,390)
Distributions							(88,936)					$ (18,771)		$ (70,165)	[2]
Stock-based compensation							8,493							$ 8,493	[2]
Shares withheld for employee taxes (in shares)														(25,141)	[2]						(25,141)
Units withheld for employee taxes		(865)					(865)							$ (865)	[2]						$ 0		$ (865)
Other comprehensive gain (loss) - unrealized gain (loss) on swap derivatives during the period		$ 2,723	$ 2,723				2,723	$ 2,723									$ 2,723									$ 2,135					$ 588
Reclassification of amortization of forward starting swaps included in interest expense					$ (193)	$ (1,098)				$ (193)	$ (1,098)								$ (193)	$ (1,098)								$ (152)	$ (864)				$ (41)	$ (234)
Ending balance (in shares) at Dec. 31, 2021												16,181,537		60,525,580	[2]
Ending balance at Dec. 31, 2021							$ 1,210,123					$ (30,138)		$ 1,236,092	[2]	$ 4,169
[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 $ in Thousands	12 Months Ended
	Dec. 31, 2021USD ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)
OPERATING ACTIVITIES
Net income	$ 36,593	$ 35,588	$ 60,188
Adjustments to reconcile net income to net cash provided by operating activities:
Deferred rent revenue and amortization of lease intangibles	(17,634)	(31,242)	(6,985)
Depreciation and amortization	116,306	108,292	96,205
Amortization of debt issuance costs and debt fair value adjustments	2,753	1,477	1,467
Gain (Loss) on Extinguishment of Debt	4,271	0	0
Gain on sale of real estate	0	0	633
Stock-based compensation expense	8,493	6,307	4,477
Settlement of forward interest rate swap agreement	0	0	513
Lease termination income	0	0	(4,518)
Other noncash interest expense	(1,098)	(1,330)	(1,304)
Other, net	1,314	(695)	4,746
Changes in operating assets and liabilities
Change in accounts receivable	2,273	(4,940)	(1,071)
Change in other assets	109	141	(2,420)
Change in accounts payable and accrued expenses	15,331	(2,108)	5,956
Change in security deposits payable	443	(1,726)	(971)
Change in other liabilities and deferred credits	1,464	(1,206)	(3,585)
Net cash provided by operating activities	168,329	126,985	153,816
INVESTING ACTIVITIES
Acquisition of real estate, net	(204,511)	0	(507,780)
Capital expenditures	(104,588)	(63,488)	(88,327)
Proceeds from sale of real estate, net of selling costs	0	0	8,191
Leasing commissions	(3,142)	(5,589)	(11,267)
Purchase of marketable securities	(47,760)	0	0
Proceeds from Sale and Maturity of Marketable Securities	47,723	0	0
Net cash used in investing activities	(312,278)	(69,077)	(599,183)
FINANCING ACTIVITIES
Repayment of secured notes payable	0	(51,003)	(20,762)
Proceeds from unsecured line of credit	0	100,000	59,000
Repayment of unsecured line of credit	100,000	0	123,000
Proceeds from issuance of unsecured notes payable	494,675	0	150,000
Debt issuance costs	(5,075)	(125)	(1,103)
Proceeds from issuance of common stock, net	0	0	515,354
Dividends paid to common stock and unitholders	(88,936)	(76,510)	(80,605)
Shares withheld for employee taxes	(865)	(672)	(1,338)
Net cash provided by (used in) financing activities	144,424	(28,310)	497,546
Net (decrease) increase in cash and cash equivalents	475	29,598	52,179
Cash, cash equivalents and restricted cash, beginning of year	139,049	109,451	57,272
Cash, cash equivalents and restricted cash, end of year	139,524	139,049	109,451
Cash and cash equivalents	139,524	137,333	99,303
Restricted cash	0	1,716	10,148
Repayments of Unsecured Debt	(155,375)	0	0
American Assets Trust, L.P.
OPERATING ACTIVITIES
Net income	36,593	35,588	60,188
Adjustments to reconcile net income to net cash provided by operating activities:
Deferred rent revenue and amortization of lease intangibles	(17,634)	(31,242)	(6,985)
Depreciation and amortization	116,306	108,292	96,205
Amortization of debt issuance costs and debt fair value adjustments	2,753	1,477	1,467
Provision for uncollectable rental income	(2,289)	18,427	1,751
Gain (Loss) on Extinguishment of Debt	4,271	0	0
Gain on sale of real estate	0	0	633
Stock-based compensation expense	8,493	6,307	4,477
Settlement of forward interest rate swap agreement	0	0	513
Lease termination income	0	0	(4,518)
Other noncash interest expense	(1,098)	(1,330)	(1,304)
Other, net	1,314	(695)	4,746
Changes in operating assets and liabilities
Change in accounts receivable	2,273	(4,940)	(1,071)
Change in other assets	109	141	(2,420)
Change in accounts payable and accrued expenses	15,331	(2,108)	5,956
Change in security deposits payable	443	(1,726)	(971)
Change in other liabilities and deferred credits	1,464	(1,206)	(3,585)
Net cash provided by operating activities	168,329	126,985	153,816
INVESTING ACTIVITIES
Acquisition of real estate, net	(204,511)	0	(507,780)
Capital expenditures	(104,588)	(63,488)	(88,327)
Proceeds from sale of real estate, net of selling costs	0	0	8,191
Leasing commissions	(3,142)	(5,589)	(11,267)
Purchase of marketable securities	(47,760)	0	0
Proceeds from Sale and Maturity of Marketable Securities	47,723	0	0
Net cash used in investing activities	(312,278)	(69,077)	(599,183)
FINANCING ACTIVITIES
Repayment of secured notes payable	0	(51,003)	(20,762)
Proceeds from unsecured line of credit	0	100,000	59,000
Repayment of unsecured line of credit	100,000	0	123,000
Proceeds from issuance of unsecured notes payable	494,675	0	150,000
Debt issuance costs	(5,075)	(125)	(1,103)
Contributions from American Assets Trust, Inc.		0
Contributions from American Assets Trust, Inc.	0		515,354
Dividends paid to common stock and unitholders	(88,936)	(76,510)	(80,605)
Shares withheld for employee taxes	(865)	(672)	(1,338)
Net cash provided by (used in) financing activities	144,424	(28,310)	497,546
Net (decrease) increase in cash and cash equivalents	475	29,598	52,179
Cash, cash equivalents and restricted cash, beginning of year	139,049	109,451	57,272
Cash, cash equivalents and restricted cash, end of year	139,524	139,049	109,451
Cash and cash equivalents	139,524	137,333	99,303
Restricted cash	0	1,716	10,148
Repayments of Unsecured Debt	$ (155,375)	$ 0	$ 0

Summary of Significant Accounti

Summary of Significant Accounting Policies (Notes)	12 Months Ended
	Dec. 31, 2021
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 208 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, 2021, we owned or had a controlling interest in 30 office, retail, multifamily and mixed-use operating properties, the operations of which we consolidate. Additionally, as of December 31, 2021, 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 La Jolla Commons One Beach Street Corporate Campus East III Torrey Reserve Campus First & Main Torrey Point Lloyd Portfolio Solana Crossing City Center Bellevue The Landmark at One Market Eastgate Office Park 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 La Jolla Commons - Construction in Progress Solana Crossing – Land Lloyd 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. The Company follows the Financial Accounting Standards Board (the "FASB") guidance for determining whether an entity is a variable interest entity (“VIE”) and requires the performance of a qualitative rather than a quantitative analysis to determine the primary beneficiary of a VIE. Under this guidance, an entity would be required to consolidate a VIE if it has (i) the power to direct the activities that most significantly impact the entity’s economic performance and (ii) the obligation to absorb losses of the VIE or the right to receive benefits from the VIE that could be significant to the VIE. American Assets Trust, Inc. has concluded that the Operating Partnership is a VIE, and because American Assets Trust, Inc. has both the power and the rights to control the Operating Partnership, American Assets Trust, Inc. is the primary beneficiary and is required to continue to consolidate the Operating Partnership. Substantially all of the assets and liabilities of the Company are related to the operating partnership VIE. All intercompany transactions and balances are eliminated in consolidation. Impact of COVID-19 We are unable to predict the impact that the COVID-19 pandemic will have on our financial condition, results of operations and cash flows due to numerous uncertainties. These uncertainties include the scope, severity and duration of the pandemic, the actions taken to contain the pandemic or mitigate its impact and the direct and indirect economic effects of the pandemic and containment measures, among others. The outbreak of COVID-19 in many countries, including the United States, has significantly adversely impacted global economic activity and has contributed to significant volatility and negative pressure in financial markets. The Company cannot predict if previously placed governmental restrictions or social distancing measures will be reinstated in the future. With the rise in cases related to COVID-19 variants, the willingness of customers to visit certain of out tenants' businesses may be reduced due to concerns regarding the continued risk of COVID-19 transmission and heightened sensitivity to risks associated with the transmission of other diseases. As a result, the COVID-19 pandemic is negatively impacting almost every industry directly or indirectly, including industries in which the Company and our tenants operate. Further, the impacts of a potential worsening of global economic conditions and the continued disruptions to, and volatility in, the credit and financial markets, consumer spending as well as other unanticipated consequences remain unknown. 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, 2021 2020 2019 Supplemental cash flow information Total interest costs incurred $ 61,578 $ 54,510 $ 54,636 Interest capitalized $ 2,991 $ 1,070 $ 628 Interest expense $ 58,587 $ 53,440 $ 54,008 Cash paid for interest, net of amounts capitalized $ 50,970 $ 53,467 $ 51,975 Cash paid for income taxes $ 356 $ 844 $ 971 Supplemental schedule of noncash investing and financing activities Accounts payable and accrued liabilities for construction in progress $ 18,697 $ 22,884 $ 25,413 Accrued leasing commissions $ 2,628 $ 555 $ 3,345 Building recorded in termination of ground lease $ — $ — $ 4,518 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, 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 $2.5 million, $2.3 million and $3.5 million for the years ended December 31, 2021, 2020 and 2019, 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. Current accounts receivable from tenants primarily relate to contractual minimum rent and percentage rent as well as real estate tax and other cost reimbursements. Accounts receivable from straight-line rent is typically longer term in nature and relates to the cumulative amount by which straight-line rental income recorded to date exceeds cash rents billed to date under the contractual 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 comprehensive income. Revenue from other sales and services provided is included in other property income on the statement of comprehensive income. We make estimates of the collectability of our current accounts receivable and straight-line rents receivable which requires significant judgment by management. The collectability of receivables is affected by numerous different factors including current economic trends, including the impact of the COVID-19 pandemic on tenant's businesses and changes in tenants' payment patterns, tenant bankruptcies, the status of collectability of current cash rents receivable, tenants' recent and historical financial and operating results, changes in our tenants' credit ratings, communications between our operating personnel and tenants, the extent of security deposits and letters of credits held with respect to tenants, and the ability of the tenant to perform under the terms of their lease agreement when evaluating the adequacy of the allowance for doubtful accounts. If our assessment of these factors indicates that it is no longer probable that we will be able to collect substantially all rents, we recognize a charge to rental income and limit our rental income to the lesser of lease income on a straight-line basis plus variable rents when they become accruable or cash collected. If we change our conclusion regarding the probability of collecting rent payments required by a lessee, we may recognize an adjustment to rental income in the period we make a change to our prior conclusion. At December 31, 2021 and December 31, 2020, our allowance for doubtful accounts was $4.6 million and $10.0 million, respectively. Total collectability related adjustments for rental income, which includes the allowance for doubtful accounts and deferred rent receivables, was $2.3 million, $18.4 million and $1.8 million for the years ended December 31, 2021, 2020 and 2019, respectively. During the year ended December 31, 2021, due to the impacts of the COVID-19 pandemic, we provided lease concessions to certain tenants, primarily within the retail segment, in the form of rent deferrals and abatements. We assess each lease concession and determine whether it represents a lease modifications under Accounting Standards Codification Topic 842, Leases ("ASC 842"). The Company has elected to account for such COVID-19-related concessions as lease modifications. 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, 2021, 2020 and 2019, real estate depreciation expense was $102.0 million, $95.8 million and $85.3 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 comprehensive 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 comprehensive 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. As discussed above, as a result of the COVID-19 pandemic, certain of the our tenants may be unable to operate their businesses, maintain profitability and make timely rental payments under their leases. Accordingly, the reduction of estimated future cash flows could result in the recognition of an impairment charge on certain of our long-lived assets. Management does not believe that the value of our real estate investments was impaired at December 31, 2021 or December 31, 2020. There were no impairment charges during the years ended December 31, 2021, 2020 and 2019. 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 or Secured Overnight Financing 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, 2021 and December 31, 2020, we had $62.2 million and $33.0 million, respectively, in excess of the FDIC insured limit. At December 31, 2021 and December 31, 2020, we had $70.8 million and $97.8 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, 2021 and 2020, we had $0.0 million and $1.7 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 comprehensive 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, 2021 and December 31, 2020 we had no investments in real estate joint ventures, and no other interests in VIEs to be evaluated for 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. For the grants of market-based restricted stock awards in December 2019 (the “2019 grant”) and December 2020 grant (the “2020 grant”), 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. For the grants of performance and market-based restricted stock awards in December 2021 (the “2021 grant”), we measure stock-based compensation expense based on the fair value of the award on the grant date, adjusted for changes to probabilities of achieving performance targets, and recognize 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 award measured immediately before its terms are modified. For the year ended December 31, 2021 and 2020, we incurred incremental compensation cost of approximately $2.6 million and $1.2 million, respectively, related to the discretionary vesting of previously granted restricted stock awards that did not meet the original vesting criteria. For the year ended December 31, 2019, 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 ended 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. 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 March 2020, the FASB issued ASU No. 2020-04, Reference Rate Reform (Topic 848) , which provides companies with optional practical expedients to ease the accounting burden for contract modifications associated with transitioning away from LIBOR and other interbank offered rates that are expected to be discontinued as part of reference rate reform. For hedges, the guidance generally allows changes to the reference rate and other critical terms without having to de-designate the hedging relationship, as well as allows the shortcut method to continue to be applied. For contract modifications, changes in the reference rate or other critical terms will be treated as a continuation of the prior contract. This guidance can be applied immediately, however, is generally only available through December 31, 2022. In January 2021, the FASB issued Accounting Standards Update 2021-01, “Reference Rate Reform (Topic 848): Scope” (“ASU 2021-01”), which clarified the scope and application of the original guidance. We are still evaluating the impact of reference rate reform and whether we will apply any of these practical expedients.

Real Estate (Notes)

Real Estate (Notes)	12 Months Ended
	Dec. 31, 2021
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, 2021 Land $ 254,016 $ 284,263 $ 72,668 $ 76,635 $ 687,582 Buildings 527,262 1,270,131 393,713 129,226 2,320,332 Land improvements 47,425 14,269 7,764 2,606 72,064 Tenant improvements 89,520 218,639 — 2,366 310,525 Furniture, fixtures, and equipment 1,098 5,003 18,039 15,416 39,556 Construction in progress (1) 7,160 87,340 4,448 364 99,312 926,481 1,879,645 496,632 226,613 3,529,371 Accumulated depreciation (335,374) (343,433) (115,317) (53,266) (847,390) Net real estate $ 591,107 $ 1,536,212 $ 381,315 $ 173,347 $ 2,681,981 December 31, 2020 Land $ 254,016 $ 225,238 $ 72,668 $ 76,635 $ 628,557 Buildings 526,522 1,137,711 392,224 128,477 2,184,934 Land improvements 47,425 11,672 7,346 2,606 69,049 Tenant improvements 88,326 186,423 — 1,890 276,639 Furniture, fixtures, and equipment 1,069 3,236 16,480 15,651 36,436 Construction in progress (1) 5,170 43,595 1,831 663 51,259 922,528 1,607,875 490,549 225,922 3,246,874 Accumulated depreciation (314,610) (290,768) (100,745) (48,017) (754,140) Net real estate $ 607,918 $ 1,317,107 $ 389,804 $ 177,905 $ 2,492,734 (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. Dispositions On May 22, 2019, we sold Solana Beach – Highway 101. The property is located in Solana Beach, California and was previously included in our retail segment. The sales price of this property was approximately $9.4 million , less costs to sell, and resulted in net proceeds to us of approximately $9.4 million. Accordingly, we recorded a gain on sale of approximately $0.0 million, $0.0 million and $0.6 million for the years ended December 31, 2021, 2020, and 2019, respectively. Property Asset Acquisitions On June 20, 2019, we acquired La Jolla Commons, consisting of two office towers totaling approximately 724,000 square feet, an entitled development parcel and two parking structures, located in San Diego, California. The acquisition was classified as an asset acquisition with a purchase price of approximately $525 million, less seller credits of (i) approximately $11.5 million for speculative lease-up, (ii) approximately $4.2 million for assumed contractual liabilities (iii) and approximately $1.7 million for closing prorations, excluding closing costs of approximately $0.2 million. The property was acquired with proceeds from an underwritten public offering and borrowings under the company's Second Amended and Restated Credit Facility. On July 7, 2021, we acquired E astgate Office Park, consisting of an approximately 280,000 square feet, multi-tenant office campus in Bellevue, Washington. The purchase price was approximately $125 million, excluding closing costs of approximately $0.2 million. The property was acquired with cash on hand. On September 10, 2021, we acquired Corporate Campus East III in Bellevue, Washington, consisting of an approximately 161,000 square feet, multi-tenant office campus. The purchase price was approximately $84 million , less seller credits of (i) approximately $1.1 million of future rent abatement (ii) approximately $2.1 million of contractual tenant improvements and closing costs of approximately $0.1 million. The property was acquired with cash on hand. The financial information set forth below summarizes the company’s purchase price allocation for each of Eastgate Office Park and Corporate Campus East III during the year ended December 31, 2021 (in thousands): Eastgate Office Park Corporate Campus East III Land $ 35,822 $ 23,203 Building 76,692 52,234 Land improvements 1,740 667 Furniture, fixtures, and equipment 4,305 3,091 Total real estate 118,559 79,195 Lease intangibles 7,023 5,341 Prepaid expenses and other assets 8 13 Assets acquired $ 125,590 $ 84,549 Accounts payable and accrued expenses $ (31) $ (9) Security deposits payable (513) (310) Other liabilities and deferred credits (535) (3,844) Liabilities assumed $ (1,079) $ (4,163) The value allocated to lease intangibles is amortized over the related lease term as depreciation and amortization expense in the statement of comprehensive income. The remaining weighted average amortization period as of December 31, 2021, is 3.2 years and 5.2 years for Eastgate Office Park and Corporate Campus East III, respectively. The following table summarizes the operating results for each of Eastgate Office Park and Corporate Campus East III included in the company's historical consolidated statement of operations for the period of acquisition through December 31, 2021 (in thousands): Eastgate Office Park Corporate Campus East III Total Revenues $ 5,139 $ 1,909 $ 7,048 Operating expenses $ (5,235) $ (2,131) $ (7,366) Operating loss $ (96) $ (222) $ (318) Net loss attributable to American Assets Trust, Inc. $ (99) $ (222) $ (321)

Acquired In-Place Leases and Ab

Acquired In-Place Leases and Above/Below Market Leases (Notes)	12 Months Ended
	Dec. 31, 2021
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, 2021 December 31, 2020 In-place leases $ 67,215 $ 60,965 Accumulated amortization (38,130) (34,758) Above market leases 2,532 5,389 Accumulated amortization (2,383) (5,268) Acquired lease intangible assets, net $ 29,234 $ 26,328 Below market leases $ 58,655 $ 56,677 Accumulated accretion (36,253) (35,219) Acquired lease intangible liabilities, net $ 22,402 $ 21,458 The value allocated to in-place leases is amortized over the related lease term as depreciation and amortization expense in the statement of comprehensive 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 comprehensive income. Rental income (loss) includes net amortization from acquired above and below market leases of $3.2 million, $3.9 million and $3.8 million in 2021, 2020 and 2019, respectively. The remaining weighted-average amortization period as of December 31, 2021, is 5.8 years, 3.7 years and 10.5 years for in-place leases, above market leases and below market leases, respectively. Below market leases include $11.5 million related to below market renewal options, and the weighted-average period prior to the commencement of the renewal options is 7.7 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, 2021 2020 2019 Amortization of in-place leases $ (6,664) $ (5,018) $ (4,762) Amortization of above market leases (34) (62) (345) Amortization of below market leases 3,271 3,994 4,131 $ (3,427) $ (1,086) $ (976) As of December 31, 2021, the amortization for acquired leases during the next five years and thereafter, assuming no early lease terminations, is as follows (in thousands): In-Place Above Market Below Market Year Ending December 31, 2022 $ 6,734 $ 41 $ 3,171 2023 4,456 41 2,896 2024 4,146 38 2,581 2025 3,580 25 2,169 2026 3,287 4 1,767 Thereafter 6,882 — 9,818 $ 29,085 $ 149 $ 22,402

Fair Value of Financial Instrum

Fair Value of Financial Instruments (Notes)	12 Months Ended
	Dec. 31, 2021
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 The carrying values of cash and cash equivalents, restricted cash, accounts receivable, accounts payable and accrued liabilities are reasonable estimates of fair value, using Level 1 inputs, because of the short-term nature of these instruments. 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. We measure the fair value of our deferred compensation liability, which is included in other liabilities and deferred credits on the consolidated balance sheet, on a recurring basis using Level 2 inputs. We measure the fair value of this liability based on prices provided by independent market participants that are based on observable inputs using market-based valuation techniques. The fair value of the interest rate swap agreements are based on the estimated amounts we would receive or pay to terminate the contract at the reporting date and are determined using interest rate pricing models and interest rate related observable inputs. The changes in the fair value of the derivatives that are designated as cash flow hedges are being recorded in accumulated other comprehensive income (loss) and will be subsequently reclassified into earnings during the period in which the hedged forecasted transaction affects earnings. We incorporate credit valuation adjustments to appropriately reflect both our own non-performance risk and the respective counterparty’s non-performance risk in the fair value measurements. In adjusting the fair value of our derivative contracts for the effect of non-performance risk, we considered the impact of netting and any applicable credit enhancements, such as collateral postings, thresholds, mutual puts, and guarantees. Although we have determined that the majority of the inputs used to value our derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with its derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by itself and its counterparties. However, as of December 31, 2021 we have assessed the significance of the impact of the credit valuation adjustments on the overall valuation of our derivative position and have determined that the credit valuation adjustments are not significant to the overall valuation of our derivative. As a result, we have determined that our derivative valuation in its entirety is classified in Level 2 of the fair value hierarchy. 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, 2021 December 31, 2020 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Deferred compensation liability $ — $ 2,503 $ — $ 2,503 $ — $ 2,059 $ — $ 2,059 Interest rate swap liability $ — $ 1,807 $ — $ 1,807 $ — $ 4,531 $ — $ 4,531 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 2.1% to 3.7%. 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, 2021 December 31, 2020 Carrying Value Fair Value Carrying Value Fair Value Secured notes payable $ 110,965 $ 113,207 $ 110,923 $ 114,074 Unsecured term loan $ 249,654 $ 250,000 $ 249,233 $ 250,000 Unsecured senior guaranteed notes $ 797,953 $ 832,795 $ 947,444 $ 1,017,378 Senior unsecured notes, net $ 490,631 $ 503,000 $ — $ — Unsecured line of credit $ — $ — $ 99,151 $ 100,000

Other Assets (Notes)

Other Assets (Notes)	12 Months Ended
	Dec. 31, 2021
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
OTHER ASSETS	OTHER ASSETS Other assets consist of the following (in thousands): December 31, 2021 December 31, 2020 Leasing commissions, net of accumulated amortization of $40,595 and $35,167, respectively $ 38,589 $ 38,173 Acquired above market leases, net 149 121 Acquired in-place leases, net 29,085 26,207 Lease incentives, net of accumulated amortization of $913 and $802, respectively 595 994 Other intangible assets, net of accumulated amortization of $1,382 and $1,213, respectively 2,445 2,565 Right-of-use lease asset, net 26,254 29,350 Prepaid expenses, deposits and other 9,136 8,702 Total other assets $ 106,253 $ 106,112

Other Liabilities and Deferred

Other Liabilities and Deferred Credits (Notes)	12 Months Ended
	Dec. 31, 2021
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, 2021 December 31, 2020 Acquired below market leases, net $ 22,402 $ 21,458 Prepaid rent and deferred revenue 16,309 14,518 Interest rate swap liability 1,807 4,531 Straight-line rent liability 14,274 18,049 Deferred rent expense and lease intangible 3 16 Deferred compensation 2,503 2,059 Deferred tax liability 967 570 Lease liability 27,917 30,060 Other liabilities 33 39 Total other liabilities and deferred credits, net $ 86,215 $ 91,300

Debt (Notes)

Debt (Notes)	12 Months Ended
	Dec. 31, 2021
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 Third Amended and Restated Credit Facility (see note 19. Subsequent Events), 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, 2021 and December 31, 2020 (in thousands): Description of Debt Principal Balance as of Stated Interest Rate Stated Maturity Date December 31, 2021 December 31, 2020 as of December 31, 2021 City Center Bellevue (1) 111,000 111,000 3.98 % November 1, 2022 111,000 111,000 Debt issuance costs, net of accumulated amortization of $387 and $345, respectively (35) (77) Total Secured Notes Payable $ 110,965 $ 110,923 (1) Interest only. Certain loans require us to comply with various financial covenants, including the maintenance of minimum debt coverage ratios. As of December 31, 2021, 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, 2021 and December 31, 2020 (in thousands): Description of Debt Principal Balance as of Stated Interest Rate Stated Maturity Date December 31, 2021 December 31, 2020 as of December 31, 2021 Term Loan A $ 100,000 $ 100,000 Variable (1) January 9, 2022 (2) Senior Guaranteed Notes, Series A (3) — 150,000 4.04 % (4) October 31, 2021 Term Loan B 100,000 100,000 Variable (5) March 1, 2023 Term Loan C 50,000 50,000 Variable (6) March 1, 2023 Senior Guaranteed Notes, Series F 100,000 100,000 3.78 % (7) 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 % (8) March 1, 2027 Senior Guaranteed Notes, Series E 100,000 100,000 4.24 % (9) May 23, 2029 Senior Guaranteed Notes, Series G 150,000 150,000 3.91 % (10) July 30, 2030 3.375% Senior Unsecured Notes 500,000 — 3.38 % February 1, 2031 1,550,000 1,200,000 Debt discount and issuance costs, net of accumulated amortization of $9,462 and $8,856, respectively (11,762) (3,323) Total Unsecured Notes Payable $ 1,538,238 $ 1,196,677 (1) As of December 31, 2021, the interest rate associated with Term Loan A was variable. However, on January 14, 2022, the Operating Partnership entered into an interest rate swap agreement that is intended to fix the interest rate associated with the 2022 Term Loan A at approximately 2.80% through January 5, 2027, subject to adjustments based on our consolidated leverage ratio. (2) On January 5, 2022, we extended the 2022 Term Loan A to a maturity date of January 5, 2027 with no further extension options. (3) Notes prepaid in full, with make-whole penalty thereon of approximately $3.9 million, on January 26, 2021. (4) The company entered into a one month forward-starting seven years 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. On January 26, 2021, we prepaid the entirety of the Senior Guaranteed Notes, Series A with make-whole premium thereon and the related swap contract was fully amortized and terminated. (5) 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. Effective March 1, 2018, the effective interest rate associated with Term Loan B is approximately 2.65%, subject to adjustments based on our consolidated leverage ratio. (6) 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. Effective March 1, 2018, the effective interest rate associated with Term Loan C is approximately 2.64%, subject to adjustments based on our consolidated leverage ratio. (7) 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. (8) 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. (9) 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. (10) The Operating Partnership entered into a treasury lock contract on June 20, 2019, which was settled on July 17, 2019 at a gain 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 3.88% per annum. On January 26, 2021, the Operating Partnership issued $500 million of senior unsecured notes (the "3.375% Senior Notes") that mature February 1, 2031 and bear interest at 3.375% per annum. The 3.375% Senior Notes were priced at 98.935% of the principal amount with a yield to maturity of 3.502%. The net proceeds of the 3.375% Senior Notes, after the issuance discount, underwriting fees, and other costs were approximately $489.7 million, which were primarily used to (i) prepay our $150 million Senior Guaranteed Notes, Series A, with a make-whole payment (as defined in the Note Purchase Agreement for the Series A Notes) thereon of approximately $3.9 million, on January 26, 2021, (ii) repay our $100 million then outstanding balance under our Revolver Loan on January 26, 2021, (iii) fund the development of the La Jolla Commons III office building and (iv) for general corporate purposes. 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 years 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 years 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 $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 January 26, 2021, we repaid the entirety of the $150.0 million Series A Notes with a make-whole payment (as defined in the Note Purchase Agreement) of approximately $3.9 million. 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"). 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. On July 30, 2019, the Operating Partnership entered into a Note Purchase Agreement for the private placement of $150 million of 3.91% Senior Guaranteed Notes, Series G, due July 30, 2030 (the "Series G Notes" and collectively with the Series A Notes, Series B Notes, Series C Notes, Series D Notes, Series E Notes, and Series G Notes are referred to herein as, the “Notes".) The Series G Notes were issued on July 30, 2019 and will pay interest semi-annually on the 30th of July and January until their maturity. 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. The Note Purchase Agreements contain 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, 2021, the Operating Partnership was in compliance with all loan covenants. Scheduled principal payments on secured and unsecured notes payable as of December 31, 2021 are as follows (in thousands): 2022 (1) $ 211,000 2023 150,000 2024 100,000 2025 200,000 2026 — Thereafter 1,000,000 $ 1,661,000 (1) On January 5, 2022, we entered into the third amended and restated credit facility, which provides for aggregate, unsecured borrowings of up to $500 million, consisting of a revolving line of credit of $400 million, or the 2022 Revolver Loan, and a term loan of $100 million, or the 2022 Term Loan A”). The 2022 Revolver Loan initially matures on January 5, 2026, subject to two, six-month extension options. The 2022 Term Loan A matures on January 5, 2027, with no further extension options. 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 months 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 were 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 provided 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 had an accordion feature that would have allowed us to increase the availability thereunder up to an additional $250 million, subject to meeting specified requirements and obtaining additional commitments from lenders. At December 31, 2021, there were no amounts outstanding balance under the Revolver Loan and the related debt issuance costs were fully amortized. Borrowings under the Second Amended and Restated Credit Facility had 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 were more favorable than previously contained in the Prior Credit Facility in place as of December 31, 2017. For the year-ended December 31, 2021, the weighted average interest rate on the Revolver Loan was 1.14%. The Revolver Loan initially matured on January 9, 2022, subject to our option to extend the Revolver Loan up to two times, with each such extension for a six months period. The 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. On October 16, 2020, we exercised an option to extend the maturity date of Term Loan A to January 9, 2022. 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 were 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 included 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 provided 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, 2021, 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, 2021
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 second 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 4.13% through its original maturity date, 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 years 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 years 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 years 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 years 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 years 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 years 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 years 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 years 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 years 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 years 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 years 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 years 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. On June 20, 2019, we entered into a treasury lock contract (the "June 2019 Treasury Lock") with Wells Fargo Bank, N.A., to reduce the interest rate variability exposure of the projected interest cash flows of our then prospective eleven-year private placement. The treasury lock contract has a notional amount of $100 million, termination date of July 31, 2019, a fixed pay rate of 1.9925%, and a receive rate equal to the ten years treasury rate on the settlement date. On July 17, 2019, we settled the June 2019 Treasury Lock, resulting in a gain of approximately $0.5 million, which is included in accumulated other comprehensive income and will be amortized to interest expense over ten years. The treasury lock contract has been deemed to be a highly effective cash flow hedge and we elected to designate the treasury lock contract as an accounting hedge. 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 August 11, 2020, we entered into a treasury lock contract (the "August 2020 Treasury Lock") with Wells Fargo Bank, N.A., to reduce the interest rate variability exposure of the projected interest cash flows of a then prospective future financing. The treasury lock contract had a notional amount of $200 million, termination date of November 12, 2020, a fixed pay rate of 0.7115%, and a receive rate equal to the ten years treasury rate on the settlement date. On January 14, 2022, we entered into two separate interest rate swap contracts, one with Wells Fargo Bank, National Association and one with Bank of America, National Association, to reduce the interest rate variability exposure of the interest cash flows of the 2022 Term Loan A. Each of the two five We determined that there was no compelling reason from a capital requirement perspective to move forward with the prospective financing at prevailing rates and, as a result, on October 1, 2020, we settled the August 2020 Treasury Lock, resulting in no gain or loss. The following is a summary of the terms of the interest rate swaps as of December 31, 2021 (dollars in thousands): Swap Counterparty Notional Amount Effective Date Maturity Date Fair Value U.S. Bank N.A. $ 100,000 3/1/2016 3/1/2023 $ (1,206) Wells Fargo Bank, N.A. $ 50,000 5/2/2016 3/1/2023 $ (601) 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. During the next twelve months, we estimate that $1.1 million will be reclassified as a decrease to interest expense.

Partners Capital of American As

Partners Capital of American Assets Trust, L.P. (Notes)	12 Months Ended
	Dec. 31, 2021
Equity [Abstract]
PARTNERS' CAPITAL OF AMERICAN ASSETS TRUST, L.P.	PARTNERS' CAPITAL OF AMERICAN ASSETS TRUST, L.P. As of December 31, 2021, the Operating Partnership had 16,181,537 common units (the “Noncontrolling Common Units”) outstanding. American Assets Trust, Inc. owned 78.8% of the Operating Partnership at December 31, 2021. The remaining 21.2% 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.

Equity of American Assets Trust

Equity of American Assets Trust, Inc. (Notes)	12 Months Ended
	Dec. 31, 2021
Equity [Abstract]
EQUITY OF AMERICAN ASSETS TRUST, INC.	EQUITY OF AMERICAN ASSETS TRUST, INC. Stockholders' Equity On December 3, 2021, we entered into a new ATM equity program, our only current 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 sale 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, 2021, no shares of common stock were sold through the ATM equity program. We intend to use the net proceeds from the ATM equity program to fund our development or redevelopment activities, repay amounts outstanding from time to time under our revolving line of credit or other debt financing obligations, fund potential acquisition opportunities and/or for general corporate purposes. As of December 31, 2021, we had the capacity to issue up to an additional $250.0 million in shares of our common stock under our current 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. As of December 31, 2021, we have no obligation to sell the remaining shares available for sale under the active ATM equity program. In June 2019, we issued and sold 10,925,000 shares of common stock in an underwritten public offering. The shares of common stock that we issued and sold included the full exercise of the underwriters' option to purchase 1,425,000 additional shares. We received net proceeds of approximately $472.6 million, after deducting underwriting discounts, commissions and offering expenses. 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, 2021. 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, 2021, 2020 and 2019: Period Amount per Share/Unit Period Covered Dividend Paid Date First Quarter 2019 $ 0.28 January 1, 2019 to March 31, 2019 March 28, 2019 Second Quarter 2019 $ 0.28 April 1, 2019 to June 30, 2019 June 27, 2019 Third Quarter 2019 $ 0.28 July 1, 2019 to September 30, 2019 September 26, 2019 Fourth Quarter 2019 $ 0.30 October 1, 2019 to December 31, 2019 December 26, 2019 First Quarter 2020 $ 0.30 January 1, 2020 to March 31, 2020 March 26, 2020 Second Quarter 2020 $ 0.20 April 1, 2020 to June 30, 2020 June 25, 2020 Third Quarter 2020 $ 0.25 July 1, 2020 to September 30, 2020 September 24, 2020 Fourth Quarter 2020 $ 0.25 October 1, 2020 to December 31, 2020 December 24, 2020 First Quarter 2021 $ 0.28 January 1, 2021 to March 31, 2021 March 25, 2021 Second Quarter 2021 $ 0.28 April 1, 2021 to June 30, 2021 June 24, 2021 Third Quarter 2021 $ 0.30 July 1, 2021 to September 30, 2021 September 23, 2021 Fourth Quarter 2021 $ 0.30 October 1, 2021 to December 31, 2021 December 23, 2021 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, 2021 2020 2019 Per Share % Per Share % Per Share % Ordinary income $ 0.73 62.6 % $ 0.66 66.0 % $ 1.09 95.6 % Capital gain — — % — — % — — % Return of capital 0.43 37.4 % 0.34 34.0 % 0.05 4.4 % Total $ 1.16 100.0 % $ 1.00 100.0 % $ 1.14 100.0 % Stock-Based Compensation The company has established the 2011 Equity Incentive Award 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. In June 2020, at the annual shareholder meeting, the shareholders approved the Amended and Restated 2011 Equity Incentive Award Plan (the "Amended and Restated 2011 Plan"). An aggregate of 4,054,411 shares of our common stock are authorized for issuance under awards granted pursuant to the Amended and Restated 2011 Plan, and as of December 31, 2021, 2,402,848 shares of common stock remain available for future issuance. The following shares of restricted common stock have been issued as of December 31, 2021: Grant Fair Value at Grant Date Number June 11, 2019 (1) $45.35 4,412 December 9, 2019 (2) $28.06 - $30.97 168,596 June 9, 2020 (1) $33.29 6,008 December 4, 2020 (3) $19.02 - $20.83 311,566 June 8, 2021 (1) 38.59 5,184 December 9, 2021 (4) $24.27 - $25.17 224,635 (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 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, 2020, 2021 and 2022, 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 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, 2021, 2022 and 2023, subject to the employee's continued employment on those dates. (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, 2022, 2023 and 2024, subject to the employee's continued employment on those dates. For the 2019 grants and 2020 grants, 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 2021 grants, the fair value of the awards was estimated using a Monte Carlo Simulation model. For the 2021 grants vesting is subject to multiple vesting conditions as follows: (1) a service condition which requires continued employment of the employee as of each vesting date during the three-year vesting term for the employee to be eligible for vesting, (2) a performance condition with respect to our FFO per share for the FFO performance periods and (3) a market condition with respect to our relative total shareholder return performance over a one-year, two-year and three-year performance period ending on November 30, 2022, 2023 and 2024 as compared to a pre-determined index. On each measurement date the performance condition and market condition performance will determine the number of shares that vest. We measure stock-based compensation expense based on the fair value of the award on the grant date, adjusted for changes to probabilities of achieving performance targets, and recognize expense over the vesting period. For the restricted stock grants that are time-vesting, issued to our non-employee directors, 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, 2021: 2021 Units Weighted Average Grant Date Fair Value Balance at beginning of year 491,957 $ 23.53 Granted 229,819 25.04 Vested (78,989) 25.00 Forfeited (155,390) 24.25 Balance at end of year 487,397 $ 23.78 We recognize noncash compensation expense ratably over the vesting period, and accordingly, we recognized $8.5 million, $6.3 million and $4.5 million in noncash compensation expense for the years ended December 31, 2021, 2020 and 2019, respectively, each of which is included in general and administrative expense on the statement of comprehensive income. Unrecognized compensation expense was $8.2 million at December 31, 2021, 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, 2021, 2020 and 2019, we had a weighted average of approximately 485,202 shares, 357,048 shares and 330,197 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, 2021, 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, 2021, 2020 and 2019 does not include 485,202, 357,048, and 330,197 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, 2021 2020 2019 NUMERATOR Net income $ 36,593 $ 35,588 $ 60,188 Less: Net income attributable to restricted shares (564) (383) (381) Less: Income attributable to unitholders in the Operating Partnership (7,653) (7,545) (14,089) Net income attributable to common stockholders—basic $ 28,376 $ 27,660 $ 45,718 Income attributable to American Assets Trust, Inc. common stockholders—basic $ 28,376 $ 27,660 $ 45,718 Plus: Income attributable to unitholders in the Operating Partnership 7,653 7,545 14,089 Net income attributable to common stockholders—diluted $ 36,029 $ 35,205 $ 59,807 DENOMINATOR Weighted average common shares outstanding—basic 59,990,740 59,806,309 54,110,949 Effect of dilutive securities—conversion of Operating Partnership units 16,181,537 16,313,454 16,675,183 Weighted average common shares outstanding—diluted 76,172,277 76,119,763 70,786,132 Earnings per common share, basic $ 0.47 $ 0.46 $ 0.84 Earnings per common share, diluted $ 0.47 $ 0.46 $ 0.84

Income Taxes (Notes)

Income Taxes (Notes)	12 Months Ended
	Dec. 31, 2021
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 ended December 31, 2011. As a REIT, we are generally not subject to corporate level income tax on the earnings distributed currently to our stockholders. 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 $1.0 million and $0.6 million as of December 31, 2021 and 2020, respectively, in relation to real estate asset basis differences and prepaid expenses for our TRS. The income tax provision included in other (expense) income on the consolidated statement of comprehensive income is as follows (in thousands): Year Ended December 31, 2021 2020 2019 Current: Federal $ — $ (542) $ 48 State 483 412 625 Deferred: Federal 118 (80) 237 State 137 201 (91) Provision for income taxes (benefit) $ 738 $ (9) $ 819

Commitments and Contingencies (

Commitments and Contingencies (Notes)	12 Months Ended
	Dec. 31, 2021
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 tenants' operations at our properties. Commitments See Footnote 13 for description of our leases, as a lessee. 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 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 $4.0 million based on operating performance through December 31, 2021. 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 years to seven years 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, 2021, 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. Fifteen of our consolidated properties, representing 43.0% of our total revenue for the year ended December 31, 2021, 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 11.3% of total revenues for the year ended December 31, 2021. Tenants in the office industry accounted for 49.6% and 51.5% of total revenues for the years December 31, 2021 and 2020, 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. Tenants in the retail industry accounted for 25.2% and 25.6% of total revenues for the years December 31, 2021 and 2020, 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 9.1% and 9.1% of total revenues for the years ended December 31, 2021 and 2020, respectively. For the years ended December 31, 2021 and 2020, no tenant accounted for more than 10.0% of our total rental revenue. At December 31, 2021, Google LLC at The Landmark at One Market accounted for 9.6% of total annualized base rent. Four other tenants (LPL Holdings, Inc., Autodesk, Inc., Smartsheet, Inc., and VMware, Inc) comprise 16.8% of our total annualized base rent at December 31, 2021, 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, 2021 for our office properties, retail properties and the retail portion of our mixed-use property.

LEASES

LEASES	12 Months Ended
	Dec. 31, 2021
Leases [Abstract]
LEASES	LEASES Lessor Operating Leases We determine if an arrangement is a lease at inception. Our lease agreements are generally for real estate, and the determination of whether such agreements contain leases generally does not require significant estimates or judgments. We lease real estate under operating leases. 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 years 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. Our leases may also include variable lease payments in the form of percentage rents based on the tenant’s level of sales achieved in excess of a breakpoint threshold. Leases on apartments generally range from seven months to fifteen months, with a majority having 12 months lease terms. Rooms at the hotel portion of our mixed-use property are rented on a nightly basis. Leases at our office and retail properties and the retail portion of our mixed-use property may contain lease extension options, at our lessee's discretion. The extension options are generally for 3 to 10 years and contain primarily rent at fixed rates or the prevailing market rent. The extension options are generally exercisable 6 to 12 months prior to the expiration of the lease and require the lessee to not be in default of the lease terms. We attempt to maximize the amount we expect to derive from the underlying real estate property following the end of a lease, to the extent it is not extended. We maintain a proactive leasing and capital improvement program that, combined with the quality and locations of our properties, has made our properties attractive to tenants. However, the residual value of a real estate property is still subject to various market-specific, asset-specific, and tenant-specific risks and characteristics. At December 31, 2021, our office, retail and mixed-use properties are located in five states: California, Oregon, Hawaii, Washington and Texas. At December 31, 2021, we had approximately 874 leases with office and retail tenants, including the retail portion of our mixed-use property. Our multifamily properties are located in Southern California and Portland, Oregon, and we had 1,910 leases with residential tenants at December 31, 2021, excluding Santa Fe Park RV Resort. As of December 31, 2021, 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): 2022 $ 235,625 2023 221,814 2024 190,860 2025 167,588 2026 152,488 Thereafter 370,926 Total $ 1,339,301 The above future minimum rentals exclude residential leases, which are typically range from seven months to fifteen months, and exclude the hotel, as rooms are rented on a nightly basis. Lessee Operating Leases We determine if an arrangement is a lease at inception. Our lease agreements are generally for real estate, and the determination of whether such agreements contain leases generally does not require significant estimates or judgments. We lease real estate under operating leases. At the Landmark at One Market, we lease, as lessee, a building adjacent to the Landmark at One Market under an operating lease effective through June 30, 2026, which we have the option to extend until 2031 by way of the remaining five years extension option (the "Annex Lease"). The lease payments under the extension option provided for under the Annex Lease will be equal to the fair rental value at the time the extension option is exercised. The extension option is included in the calculation of the right-of-use asset and lease liability as we are reasonably certain of exercising the extension option. In March 2020, we exercised a five years extension option to extend the Annex Lease through June 30, 2026, which was memorialized in a lease amendment executed in August 2020 that additionally modified other certain lease payment terms. Our lease agreements do not contain any residual value guarantees or material restrictive covenants. As our leases do not provide an implicit rate, we use our incremental borrowing rate based on the information available at commencement in determining the present value of lease payments. Current annual payments under the operating leases are as follows, as of December 31, 2021 (in thousands): Year Ending December 31, 2022 $ 3,232 2023 3,328 2024 3,428 2025 3,531 2026 3,584 Thereafter 16,126 Total lease payments $ 33,229 Imputed interest (5,312) Present value of lease liability $ 27,917 Lease costs under the operating leases are as follows (in thousands): Year Ended December 31, 2021 2020 Operating lease cost $ 3,926 $ 3,902 Sublease income (3,634) (4,297) Total lease (income) cost $ 292 $ (395) Weighted-average remaining lease term - operating leases (in years) 9.5 Weighted-average discount rate - operating leases 3.19 % Supplemental cash flow information and non-cash activity related to our operating leases are as follow (in thousands): Year Ended December 31, 2021 2020 Operating cash flow information: Cash paid for amounts included in the measurement of lease liabilities $ 2,791 $ 3,422 Non-cash activity: Right-of-use assets obtained in exchange for operating lease obligations $ — $ 27,321 Subleases At The Landmark at One Market, we (as sublandlord) sublease the Annex Lease building under operating leases effective through December 31, 2029. The subleases contain extension options, subject to our ability to extend the Annex Lease, that can extend the subleases through December 31, 2039 at the fair rental value at the time the extension option is exercised.
LEASES	LEASES Lessor Operating Leases We determine if an arrangement is a lease at inception. Our lease agreements are generally for real estate, and the determination of whether such agreements contain leases generally does not require significant estimates or judgments. We lease real estate under operating leases. 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 years 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. Our leases may also include variable lease payments in the form of percentage rents based on the tenant’s level of sales achieved in excess of a breakpoint threshold. Leases on apartments generally range from seven months to fifteen months, with a majority having 12 months lease terms. Rooms at the hotel portion of our mixed-use property are rented on a nightly basis. Leases at our office and retail properties and the retail portion of our mixed-use property may contain lease extension options, at our lessee's discretion. The extension options are generally for 3 to 10 years and contain primarily rent at fixed rates or the prevailing market rent. The extension options are generally exercisable 6 to 12 months prior to the expiration of the lease and require the lessee to not be in default of the lease terms. We attempt to maximize the amount we expect to derive from the underlying real estate property following the end of a lease, to the extent it is not extended. We maintain a proactive leasing and capital improvement program that, combined with the quality and locations of our properties, has made our properties attractive to tenants. However, the residual value of a real estate property is still subject to various market-specific, asset-specific, and tenant-specific risks and characteristics. At December 31, 2021, our office, retail and mixed-use properties are located in five states: California, Oregon, Hawaii, Washington and Texas. At December 31, 2021, we had approximately 874 leases with office and retail tenants, including the retail portion of our mixed-use property. Our multifamily properties are located in Southern California and Portland, Oregon, and we had 1,910 leases with residential tenants at December 31, 2021, excluding Santa Fe Park RV Resort. As of December 31, 2021, 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): 2022 $ 235,625 2023 221,814 2024 190,860 2025 167,588 2026 152,488 Thereafter 370,926 Total $ 1,339,301 The above future minimum rentals exclude residential leases, which are typically range from seven months to fifteen months, and exclude the hotel, as rooms are rented on a nightly basis. Lessee Operating Leases We determine if an arrangement is a lease at inception. Our lease agreements are generally for real estate, and the determination of whether such agreements contain leases generally does not require significant estimates or judgments. We lease real estate under operating leases. At the Landmark at One Market, we lease, as lessee, a building adjacent to the Landmark at One Market under an operating lease effective through June 30, 2026, which we have the option to extend until 2031 by way of the remaining five years extension option (the "Annex Lease"). The lease payments under the extension option provided for under the Annex Lease will be equal to the fair rental value at the time the extension option is exercised. The extension option is included in the calculation of the right-of-use asset and lease liability as we are reasonably certain of exercising the extension option. In March 2020, we exercised a five years extension option to extend the Annex Lease through June 30, 2026, which was memorialized in a lease amendment executed in August 2020 that additionally modified other certain lease payment terms. Our lease agreements do not contain any residual value guarantees or material restrictive covenants. As our leases do not provide an implicit rate, we use our incremental borrowing rate based on the information available at commencement in determining the present value of lease payments. Current annual payments under the operating leases are as follows, as of December 31, 2021 (in thousands): Year Ending December 31, 2022 $ 3,232 2023 3,328 2024 3,428 2025 3,531 2026 3,584 Thereafter 16,126 Total lease payments $ 33,229 Imputed interest (5,312) Present value of lease liability $ 27,917 Lease costs under the operating leases are as follows (in thousands): Year Ended December 31, 2021 2020 Operating lease cost $ 3,926 $ 3,902 Sublease income (3,634) (4,297) Total lease (income) cost $ 292 $ (395) Weighted-average remaining lease term - operating leases (in years) 9.5 Weighted-average discount rate - operating leases 3.19 % Supplemental cash flow information and non-cash activity related to our operating leases are as follow (in thousands): Year Ended December 31, 2021 2020 Operating cash flow information: Cash paid for amounts included in the measurement of lease liabilities $ 2,791 $ 3,422 Non-cash activity: Right-of-use assets obtained in exchange for operating lease obligations $ — $ 27,321 Subleases At The Landmark at One Market, we (as sublandlord) sublease the Annex Lease building under operating leases effective through December 31, 2029. The subleases contain extension options, subject to our ability to extend the Annex Lease, that can extend the subleases through December 31, 2039 at the fair rental value at the time the extension option is exercised.

Component of Rental Income and

Component of Rental Income and Expense (Notes)	12 Months Ended
	Dec. 31, 2021
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, 2021 2020 2019 Minimum rents Office $ 180,704 $ 170,853 $ 136,118 Retail 89,326 82,176 99,601 Multifamily 48,654 47,071 47,448 Mixed-Use 9,901 7,302 15,702 Percentage rent 4,337 3,516 2,476 Hotel revenue 24,935 17,209 40,297 Other 2,351 2,185 2,223 Total rental income $ 360,208 $ 330,312 $ 343,865 Minimum rents include $14.0 million, $18.9 million and $3.2 million for the years ended December 31, 2021, 2020 and 2019, respectively, to recognize minimum rents on a straight-line basis. In addition, minimum rents include $3.2 million, $3.9 million and $3.8 million for the years ended December 31, 2021, 2020 and 2019, 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, 2021 2020 2019 Rental operating $ 41,488 $ 38,194 $ 38,331 Hotel operating 17,518 13,691 24,522 Repairs and maintenance 18,113 17,813 17,035 Marketing 1,779 2,023 2,538 Rent 4,023 3,955 3,372 Hawaii excise tax 2,792 2,479 4,160 Management fees 1,267 1,023 2,009 Total rental expenses $ 86,980 $ 79,178 $ 91,967

Other Income (Expenses) (Notes)

Other Income (Expenses) (Notes)	12 Months Ended
	Dec. 31, 2021
Other Income and Expenses [Abstract]
OTHER INCOME (EXPENSE)	OTHER (EXPENSE) INCOME The principal components of other (expense) income, net are as follows (in thousands): Year Ended December 31, 2021 2020 2019 Interest and investment income $ 324 $ 436 $ 696 Income tax (expense) benefit (738) 9 (819) Other non-operating (expense) income (4) 2 1 Total other (expense) income $ (418) $ 447 $ (122)

Related Party Transactions (Not

Related Party Transactions (Notes)	12 Months Ended
	Dec. 31, 2021
Related Party Transactions [Abstract]
RELATED PARTY TRANSACTIONS	RELATED PARTY TRANSACTIONS During the first quarter of 2019, we terminated the lease agreement with American Assets, Inc. ("AAI"), an entity owned and controlled by Mr. Rady, and entered into a new lease agreement with AAI for office space at Torrey Reserve Campus. Rents commenced on March 1, 2019 for an initial lease term of three years at an average annual rental rate of $0.2 million. During the third quarter of 2020, we entered into a new lease with AAI for office space at Torrey Point to replace its existing lease at Torrey Reserve Campus. Rents commenced on March 1, 2021 for an initial lease term of ten years at an average annual rental rate of $0.2 million. Rental revenue recognized on the leases of $0.3 million, $0.2 million and $0.2 million for the years ended December 31, 2021, 2020 and 2019, respectively, is included in rental income on the consolidated statements of comprehensive income. At Torrey Reserve Campus, we lease space to EDisability, LLC, an entity majority owned and controlled by Mr. Rady. During the fourth quarter of 2020, we entered into a lease termination agreement with EDisability, LLC and entered into a new lease agreement for office space at Torrey Reserve Campus. Rents under the new lease agreement commenced on June 1, 2021 for an initial three years at an average rental rate of $0.1 million. Rent revenue recognized on the lease of $0.1 million, $0.2 million and $0.2 million for the years ended December 31, 2021, 2020 and 2018, respectively, is included in rental income on the consolidated statements of comprehensive income. On occasion, the company utilizes aircraft services provided by AAI Aviation, Inc. ("AAIA"), an entity owned and controlled by Mr. Rady. For the years ending December 31, 2021, 2020 and 2019, we incurred approximately $0.2 million, $0.0 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, 2021, Mr. Rady and his affiliates owned approximately 14.4% of our outstanding common stock and 19.5% of our outstanding common units, which together represent an approximate 33.9% 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 $1.0 million, $1.0 million and $1.1 million were made for the years ended December 31, 2021, 2020 and 2019, respectively, and included in rental expenses on the statements of comprehensive income.

Segment Reporting (Notes)

Segment Reporting (Notes)	12 Months Ended
	Dec. 31, 2021
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, 2021 2020 2019 Total Office Property revenue $ 186,366 $ 177,554 $ 144,683 Property expense (50,233) (47,424) (42,234) Segment profit 136,133 130,130 102,449 Total Retail Property revenue 94,662 88,280 107,604 Property expense (27,983) (27,374) (30,633) Segment profit 66,679 60,906 76,971 Total Multifamily Property revenue 52,315 50,327 51,066 Property expense (23,211) (22,074) (20,863) Segment profit 29,104 28,253 30,203 Total Mixed-Use Property revenue 42,485 28,412 63,388 Property expense (28,347) (24,247) (38,250) Segment profit 14,138 4,165 25,138 Total segments’ profit $ 246,054 $ 223,454 $ 234,761 The following table is a reconciliation of segment profit to net income attributable to stockholders (in thousands): Year Ended December 31, 2021 2020 2019 Total segments' profit $ 246,054 $ 223,454 $ 234,761 General and administrative (29,879) (26,581) (24,871) Depreciation and amortization (116,306) (108,292) (96,205) Interest expense (58,587) (53,440) (54,008) Loss on early extinguishment of debt (4,271) — — Gain on sale of real estate — — 633 Other (expense) income, net (418) 447 (122) Net income 36,593 35,588 60,188 Net income attributable to restricted shares (564) (383) (381) Net income attributable to unitholders in the Operating Partnership (7,653) (7,545) (14,089) Net income attributable to American Assets Trust, Inc. stockholders $ 28,376 $ 27,660 $ 45,718 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, 2021 December 31, 2020 Net real estate Office $ 1,536,212 $ 1,317,107 Retail 591,107 607,918 Multifamily 381,315 389,804 Mixed-Use 173,347 177,905 $ 2,681,981 $ 2,492,734 Secured Notes Payable (1) Office $ 111,000 $ 111,000 Retail — — $ 111,000 $ 111,000 Capital Expenditures (2) Office $ 93,116 $ 52,882 Retail 7,232 8,596 Multifamily 5,841 3,897 Mixed-Use 1,541 3,702 $ 107,730 $ 69,077 (1) Excludes unamortized debt issuance costs of $0.0 million and $0.1 million as of December 31, 2021 and 2020, 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, 2021
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 2021 and 2020 (in thousands, except per shares data): Three Months Ended December 31, September 30, June 30, March 31, Total revenue $ 101,747 $ 98,286 $ 91,809 $ 83,986 Operating income 25,715 27,669 26,423 20,062 Net income 10,478 12,895 11,487 1,733 Net income attributable to restricted shares (147) (145) (135) (137) Net income attributable to unitholders in the Operating Partnership (2,194) (2,709) (2,411) (339) Net income attributable to American Assets Trust, Inc. stockholders $ 8,137 $ 10,041 $ 8,941 $ 1,257 Net income per share attributable to common stockholders - basic and diluted $ 0.14 $ 0.17 $ 0.15 $ 0.02 Three Months Ended December 31, September 30, June 30, March 31, Total revenue $ 81,347 $ 84,374 $ 82,109 $ 96,743 Operating income 16,415 20,323 22,995 28,848 Net income 3,788 6,490 9,826 15,484 Net income attributable to restricted shares (123) (87) (69) (104) Net income attributable to unitholders in the Operating Partnership (767) (1,365) (2,101) (3,312) Net income attributable to American Assets Trust, Inc. stockholders $ 2,898 $ 5,038 $ 7,656 $ 12,068 Net income per share attributable to common stockholders - basic and diluted $ 0.05 $ 0.08 $ 0.13 $ 0.20 The tables below reflect selected American Assets Trust, L.P. quarterly information for 2021 and 2020 (in thousands, except per shares data): Three Months Ended December 31, September 30, June 30, March 31, Total revenue $ 101,747 $ 98,286 $ 91,809 $ 83,986 Operating income 25,715 27,669 26,423 20,062 Net income 10,478 12,895 11,487 1,733 Net income attributable to restricted shares (147) (145) (135) (137) Net income attributable to American Assets Trust, L.P. unit holders $ 10,331 $ 12,750 $ 11,352 $ 1,596 Net income per unit attributable to unit holders - basic and diluted $ 0.14 $ 0.17 $ 0.15 $ 0.02 Three Months Ended December 31, September 30, June 30, March 31, Total revenue $ 81,347 $ 84,374 $ 82,109 $ 96,743 Operating income 16,415 20,323 22,995 28,848 Net income 3,788 6,490 9,826 15,484 Net income attributable to restricted shares (123) (87) (69) (104) Net income attributable to American Assets Trust, L.P. unit holders $ 3,665 $ 6,403 $ 9,757 $ 15,380 Net income per unit attributable to common unit holders - basic and diluted $ 0.05 $ 0.08 $ 0.13 $ 0.20

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2021
Subsequent Events [Abstract]
Subsequent Events	SUBSEQUENT EVENTSOn January 5, 2022, we entered into the Third Amended and Restated Credit Facility, which provides for aggregate, unsecured borrowings of up to $500 million, consisting of a revolving line of credit of $400 million, the 2022 Revolver Loan, and a term loan of $100 million, the 2022 Term Loan A. The 2022 Revolver Loan initially matures on January 5, 2026, subject to two, six-month extension options. The 2022 Term Loan A matures on January 5, 2027, with no further extension options. Additionally, on January 14, 2022, the company entered into an interest rate swap agreement that is intended to fix the interest rate associated with the 2022 Term Loan A at approximately 2.80% through January 5, 2027, subject to adjustments based on our consolidated leverage ratio.

SCHEDULE III-Consolidated Real

SCHEDULE III-Consolidated Real Estate and Accumulated Depreciation (Notes)	12 Months Ended
	Dec. 31, 2021
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, 2021 Initial Cost Cost Capitalized Subsequent to Acquisition Gross Carrying Amount Accumulated Year Built/ Date Acquired Life on which depreciation in latest income statements is computed Description Land Building and Land Building and Alamo Quarry Market $ — $ 26,396 $ 109,294 $ 21,557 $ 26,816 $ 130,431 $ (68,138) 1997/1999 12/9/2003 35 years Carmel Country Plaza — 4,200 — 13,235 4,200 13,235 (9,361) 1991 1/10/1989 35 years Carmel Mountain Plaza — 22,477 65,217 37,619 31,034 94,279 (50,201) 1994/2014 3/28/2003 35 years Del Monte Center — 27,412 87,570 34,958 27,117 122,823 (73,187) 1967/1984/2006 4/8/2004 35 years Gateway Marketplace — 17,363 21,644 1,239 17,363 22,883 (3,767) 1997/2016 7/6/2017 35 years Geary Marketplace — 8,239 12,353 227 8,239 12,580 (3,593) 2012 12/19/2012 35 years Hassalo on Eighth - Retail — — — 29,044 597 28,447 (7,821) 2015 7/1/2011 35 years Lomas Santa Fe Plaza — 8,600 11,282 14,081 8,620 25,343 (18,707) 1972/1997 6/12/1995 35 years The Shops at Kalakaua — 13,993 10,817 144 14,006 10,948 (5,342) 1971/2006 3/31/2005 35 years Solana Beach Towne Centre — 40,980 38,842 4,577 40,980 43,419 (15,212) 1973/2000/2004 1/19/2011 35 years South Bay Marketplace — 4,401 — 12,653 4,401 12,653 (8,383) 1997 9/16/1995 35 years Waikele Center — 55,593 126,858 43,617 70,644 155,424 (71,661) 1993/2008 9/16/2004 35 years City Center Bellevue 111,000 25,135 190,998 57,802 25,135 248,800 (73,173) 1987 8/21/2012 40 years Eastgate Office Park — 35,822 82,737 490 35,822 83,227 (1,854) 1985 7/7/2021 40 years Corporate Campus East III — 23,203 55,992 11 23,203 56,003 (681) 1986 9/10/2021 40 years First & Main — 14,697 109,739 11,260 14,697 120,999 (37,427) 2010 3/11/2011 40 years The Landmark at One Market — 34,575 141,196 32,405 34,575 173,601 (47,420) 1917/2000 6/30/2010 40 years Lloyd Portfolio — 18,660 61,401 104,807 11,845 173,023 (50,452) 1940-2015 7/1/2011 40 years One Beach Street — 15,332 18,017 20,378 15,332 38,395 (4,456) 1924/1972/1987/1992 1/24/2012 40 years Solana Crossing: Solana Crossing I-II — 7,111 17,100 8,166 7,111 25,266 (8,342) 1982/2005 1/19/2011 40 years Solana Crossing III-IV — 7,298 27,887 6,271 7,298 34,158 (10,859) 1982/2005 1/19/2011 40 years Solana Crossing Land — 487 — 60 547 — — N/A 1/19/2011 N/A Torrey Reserve Campus: Torrey Plaza — 4,095 — 59,936 5,408 58,623 (23,260) 1996-1997/2014 6/6/1989 40 years Pacific North Court — 3,263 — 28,599 4,309 27,553 (13,860) 1997-1998 6/6/1989 40 years Pacific South Court — 3,285 — 40,015 4,226 39,074 (17,795) 1996-1997 6/6/1989 40 years Pacific VC — 1,413 — 10,637 2,148 9,902 (6,076) 1998/2000 6/6/1989 40 years Pacific Torrey Daycare — 715 — 1,963 911 1,767 (1,040) 1996-1997 6/6/1989 40 years Torrey Reserve Building 6 — — — 8,012 682 7,330 (2,372) 2013 6/6/1989 40 years Torrey Reserve Building 5 — — — 4,012 1,017 2,995 (678) 2014 6/6/1989 40 years Torrey Reserve Building 13 & 14 — — — 16,139 2,188 13,951 (3,566) 2015 6/6/1989 40 years Torrey Point — 2,073 741 49,779 5,050 47,543 (5,496) 2018 5/9/1997 40 years La Jolla Commons La Jolla Commons I-II — 62,312 393,662 2,507 62,312 396,169 (34,627) 2008-2014 6/20/2019 40 years La Jolla Commons Land — 20,446 — 37,003 20,446 37,003 — N/A 6/20/2019 N/A Imperial Beach Gardens — 1,281 4,820 6,085 1,281 10,905 (8,692) 1959/2008 7/31/1985 30 years Loma Palisades — 14,000 16,570 34,101 14,052 50,619 (31,846) 1958/2001 - 2008/2021 7/20/1990 30 years Mariner’s Point — 2,744 4,540 1,902 2,744 6,442 (4,236) 1986 5/9/2001 30 years Santa Fe Park RV Resort — 401 928 1,460 401 2,388 (1,613) 1971/2007-2008 6/1/1979 30 years Encumbrance as of December 31, 2021 Initial Cost Cost Capitalized Subsequent to Acquisition Gross Carrying Amount Accumulated Year Built/ Date Acquired Life on which depreciation in latest income statements is computed Description Land Building and Land Building and Pacific Ridge Apartments — 47,971 178,497 2,831 47,971 181,328 (31,341) 2013 4/28/2017 30 years Hassalo on Eighth - Multifamily — — — 178,503 6,219 172,284 (37,589) 2015 7/1/2011 30 years Waikiki Beach Walk: Retail — 45,995 74,943 971 45,995 75,914 (25,065) 2006 1/19/2011 35 years Hotel — 30,640 60,029 14,033 30,640 74,062 (28,201) 2008/2014/2020 1/19/2011 35 years $ 111,000 $ 652,608 $ 1,923,674 $ 953,089 $ 687,582 $ 2,841,789 $ (847,390) (1) For Federal tax purposes, the aggregate tax basis is approximately $2.5 billion as of December 31, 2021. Year Ended December 31, 2021 2020 2019 Real estate assets Balance, beginning of period $ 3,246,874 3,188,697 2,630,191 Additions: Property acquisitions 197,754 — 476,421 Improvements 93,455 64,997 101,285 Deductions: Cost of Real Estate Sold — — (8,845) Other (1) (8,712) (6,820) (10,355) Balance, end of period $ 3,529,371 $ 3,246,874 $ 3,188,697 Accumulated depreciation Balance, beginning of period $ 754,140 $ 665,222 $ 590,338 Additions—depreciation 101,962 95,738 85,428 Deductions: Cost of Real Estate Sold — — (189) Other (1) (8,712) (6,820) (10,355) Balance, end of period $ 847,390 $ 754,140 $ 665,222 (1) Other deductions for the years ended December 31, 2021, 2020 and 2019 represent the write-off of fully depreciated assets.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2021
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 208 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, 2021, we owned or had a controlling interest in 30 office, retail, multifamily and mixed-use operating properties, the operations of which we consolidate. Additionally, as of December 31, 2021, 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 La Jolla Commons One Beach Street Corporate Campus East III Torrey Reserve Campus First & Main Torrey Point Lloyd Portfolio Solana Crossing City Center Bellevue The Landmark at One Market Eastgate Office Park 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 La Jolla Commons - Construction in Progress Solana Crossing – Land Lloyd 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. The Company follows the Financial Accounting Standards Board (the "FASB") guidance for determining whether an entity is a variable interest entity (“VIE”) and requires the performance of a qualitative rather than a quantitative analysis to determine the primary beneficiary of a VIE. Under this guidance, an entity would be required to consolidate a VIE if it has (i) the power to direct the activities that most significantly impact the entity’s economic performance and (ii) the obligation to absorb losses of the VIE or the right to receive benefits from the VIE that could be significant to the VIE. American Assets Trust, Inc. has concluded that the Operating Partnership is a VIE, and because American Assets Trust, Inc. has both the power and the rights to control the Operating Partnership, American Assets Trust, Inc. is the primary beneficiary and is required to continue to consolidate the Operating Partnership. Substantially all of the assets and liabilities of the Company are related to the operating partnership VIE. All intercompany transactions and balances are eliminated in consolidation.
Use of Estimates	Use of EstimatesThe 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, 2021 2020 2019 Supplemental cash flow information Total interest costs incurred $ 61,578 $ 54,510 $ 54,636 Interest capitalized $ 2,991 $ 1,070 $ 628 Interest expense $ 58,587 $ 53,440 $ 54,008 Cash paid for interest, net of amounts capitalized $ 50,970 $ 53,467 $ 51,975 Cash paid for income taxes $ 356 $ 844 $ 971 Supplemental schedule of noncash investing and financing activities Accounts payable and accrued liabilities for construction in progress $ 18,697 $ 22,884 $ 25,413 Accrued leasing commissions $ 2,628 $ 555 $ 3,345 Building recorded in termination of ground lease $ — $ — $ 4,518
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, 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 $2.5 million, $2.3 million and $3.5 million for the years ended December 31, 2021, 2020 and 2019, 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. Current accounts receivable from tenants primarily relate to contractual minimum rent and percentage rent as well as real estate tax and other cost reimbursements. Accounts receivable from straight-line rent is typically longer term in nature and relates to the cumulative amount by which straight-line rental income recorded to date exceeds cash rents billed to date under the contractual 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 comprehensive income. Revenue from other sales and services provided is included in other property income on the statement of comprehensive income. We make estimates of the collectability of our current accounts receivable and straight-line rents receivable which requires significant judgment by management. The collectability of receivables is affected by numerous different factors including current economic trends, including the impact of the COVID-19 pandemic on tenant's businesses and changes in tenants' payment patterns, tenant bankruptcies, the status of collectability of current cash rents receivable, tenants' recent and historical financial and operating results, changes in our tenants' credit ratings, communications between our operating personnel and tenants, the extent of security deposits and letters of credits held with respect to tenants, and the ability of the tenant to perform under the terms of their lease agreement when evaluating the adequacy of the allowance for doubtful accounts. If our assessment of these factors indicates that it is no longer probable that we will be able to collect substantially all rents, we recognize a charge to rental income and limit our rental income to the lesser of lease income on a straight-line basis plus variable rents when they become accruable or cash collected. If we change our conclusion regarding the probability of collecting rent payments required by a lessee, we may recognize an adjustment to rental income in the period we make a change to our prior conclusion. At December 31, 2021 and December 31, 2020, our allowance for doubtful accounts was $4.6 million and $10.0 million, respectively. Total collectability related adjustments for rental income, which includes the allowance for doubtful accounts and deferred rent receivables, was $2.3 million, $18.4 million and $1.8 million for the years ended December 31, 2021, 2020 and 2019, respectively.
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, 2021, 2020 and 2019, real estate depreciation expense was $102.0 million, $95.8 million and $85.3 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 comprehensive 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 comprehensive 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
Capitalized Costs	Capitalized CostsWe 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 AssetsWe 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. As discussed above, as a result of the COVID-19 pandemic, certain of the our tenants may be unable to operate their businesses, maintain profitability and make timely rental payments under their leases. Accordingly, the reduction of estimated future cash flows could result in the recognition of an impairment charge on certain of our long-lived assets. Management does not believe that the value of our real estate investments was impaired at December 31, 2021 or December 31, 2020.
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.
Cash and Cash Equivalents	Cash and Cash EquivalentsWe 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 CashRestricted 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 AssetsOther 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 comprehensive 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 EntitiesCertain 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. For the grants of market-based restricted stock awards in December 2019 (the “2019 grant”) and December 2020 grant (the “2020 grant”), 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. For the grants of performance and market-based restricted stock awards in December 2021 (the “2021 grant”), we measure stock-based compensation expense based on the fair value of the award on the grant date, adjusted for changes to probabilities of achieving performance targets, and recognize 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.
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 ended 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. 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.
Segment Information	Segment InformationSegment 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 March 2020, the FASB issued ASU No. 2020-04, Reference Rate Reform (Topic 848) , which provides companies with optional practical expedients to ease the accounting burden for contract modifications associated with transitioning away from LIBOR and other interbank offered rates that are expected to be discontinued as part of reference rate reform. For hedges, the guidance generally allows changes to the reference rate and other critical terms without having to de-designate the hedging relationship, as well as allows the shortcut method to continue to be applied. For contract modifications, changes in the reference rate or other critical terms will be treated as a continuation of the prior contract. This guidance can be applied immediately, however, is generally only available through December 31, 2022. In January 2021, the FASB issued Accounting Standards Update 2021-01, “Reference Rate Reform (Topic 848): Scope” (“ASU 2021-01”), which clarified the scope and application of the original guidance. We are still evaluating the impact of reference rate reform and whether we will apply any of these practical expedients.
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 The carrying values of cash and cash equivalents, restricted cash, accounts receivable, accounts payable and accrued liabilities are reasonable estimates of fair value, using Level 1 inputs, because of the short-term nature of these instruments. 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. We measure the fair value of our deferred compensation liability, which is included in other liabilities and deferred credits on the consolidated balance sheet, on a recurring basis using Level 2 inputs. We measure the fair value of this liability based on prices provided by independent market participants that are based on observable inputs using market-based valuation techniques. The fair value of the interest rate swap agreements are based on the estimated amounts we would receive or pay to terminate the contract at the reporting date and are determined using interest rate pricing models and interest rate related observable inputs. The changes in the fair value of the derivatives that are designated as cash flow hedges are being recorded in accumulated other comprehensive income (loss) and will be subsequently reclassified into earnings during the period in which the hedged forecasted transaction affects earnings. We incorporate credit valuation adjustments to appropriately reflect both our own non-performance risk and the respective counterparty’s non-performance risk in the fair value measurements. In adjusting the fair value of our derivative contracts for the effect of non-performance risk, we considered the impact of netting and any applicable credit enhancements, such as collateral postings, thresholds, mutual puts, and guarantees. Although we have determined that the majority of the inputs used to value our derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with its derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by itself and its counterparties. However, as of December 31, 2021 we have assessed the significance of the impact of the credit valuation adjustments on the overall valuation of our derivative position and have determined that the credit valuation adjustments are not significant to the overall valuation of our derivative. As a result, we have determined that our derivative valuation in its entirety is classified in Level 2 of the fair value hierarchy.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2021
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 La Jolla Commons One Beach Street Corporate Campus East III Torrey Reserve Campus First & Main Torrey Point Lloyd Portfolio Solana Crossing City Center Bellevue The Landmark at One Market Eastgate Office Park 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 La Jolla Commons - Construction in Progress Solana Crossing – Land Lloyd Portfolio – Construction in Progress A summary of our real estate investments is as follows (in thousands): Retail Office Multifamily Mixed-Use Total December 31, 2021 Land $ 254,016 $ 284,263 $ 72,668 $ 76,635 $ 687,582 Buildings 527,262 1,270,131 393,713 129,226 2,320,332 Land improvements 47,425 14,269 7,764 2,606 72,064 Tenant improvements 89,520 218,639 — 2,366 310,525 Furniture, fixtures, and equipment 1,098 5,003 18,039 15,416 39,556 Construction in progress (1) 7,160 87,340 4,448 364 99,312 926,481 1,879,645 496,632 226,613 3,529,371 Accumulated depreciation (335,374) (343,433) (115,317) (53,266) (847,390) Net real estate $ 591,107 $ 1,536,212 $ 381,315 $ 173,347 $ 2,681,981 December 31, 2020 Land $ 254,016 $ 225,238 $ 72,668 $ 76,635 $ 628,557 Buildings 526,522 1,137,711 392,224 128,477 2,184,934 Land improvements 47,425 11,672 7,346 2,606 69,049 Tenant improvements 88,326 186,423 — 1,890 276,639 Furniture, fixtures, and equipment 1,069 3,236 16,480 15,651 36,436 Construction in progress (1) 5,170 43,595 1,831 663 51,259 922,528 1,607,875 490,549 225,922 3,246,874 Accumulated depreciation (314,610) (290,768) (100,745) (48,017) (754,140) Net real estate $ 607,918 $ 1,317,107 $ 389,804 $ 177,905 $ 2,492,734 (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, 2021 2020 2019 Supplemental cash flow information Total interest costs incurred $ 61,578 $ 54,510 $ 54,636 Interest capitalized $ 2,991 $ 1,070 $ 628 Interest expense $ 58,587 $ 53,440 $ 54,008 Cash paid for interest, net of amounts capitalized $ 50,970 $ 53,467 $ 51,975 Cash paid for income taxes $ 356 $ 844 $ 971 Supplemental schedule of noncash investing and financing activities Accounts payable and accrued liabilities for construction in progress $ 18,697 $ 22,884 $ 25,413 Accrued leasing commissions $ 2,628 $ 555 $ 3,345 Building recorded in termination of ground lease $ — $ — $ 4,518

Real Estate (Tables)

Real Estate (Tables)	12 Months Ended
	Dec. 31, 2021
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 La Jolla Commons One Beach Street Corporate Campus East III Torrey Reserve Campus First & Main Torrey Point Lloyd Portfolio Solana Crossing City Center Bellevue The Landmark at One Market Eastgate Office Park 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 La Jolla Commons - Construction in Progress Solana Crossing – Land Lloyd Portfolio – Construction in Progress A summary of our real estate investments is as follows (in thousands): Retail Office Multifamily Mixed-Use Total December 31, 2021 Land $ 254,016 $ 284,263 $ 72,668 $ 76,635 $ 687,582 Buildings 527,262 1,270,131 393,713 129,226 2,320,332 Land improvements 47,425 14,269 7,764 2,606 72,064 Tenant improvements 89,520 218,639 — 2,366 310,525 Furniture, fixtures, and equipment 1,098 5,003 18,039 15,416 39,556 Construction in progress (1) 7,160 87,340 4,448 364 99,312 926,481 1,879,645 496,632 226,613 3,529,371 Accumulated depreciation (335,374) (343,433) (115,317) (53,266) (847,390) Net real estate $ 591,107 $ 1,536,212 $ 381,315 $ 173,347 $ 2,681,981 December 31, 2020 Land $ 254,016 $ 225,238 $ 72,668 $ 76,635 $ 628,557 Buildings 526,522 1,137,711 392,224 128,477 2,184,934 Land improvements 47,425 11,672 7,346 2,606 69,049 Tenant improvements 88,326 186,423 — 1,890 276,639 Furniture, fixtures, and equipment 1,069 3,236 16,480 15,651 36,436 Construction in progress (1) 5,170 43,595 1,831 663 51,259 922,528 1,607,875 490,549 225,922 3,246,874 Accumulated depreciation (314,610) (290,768) (100,745) (48,017) (754,140) Net real estate $ 607,918 $ 1,317,107 $ 389,804 $ 177,905 $ 2,492,734 (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.

Acquired In-Place Leases and _2

Acquired In-Place Leases and Above/Below Market Leases (Tables)	12 Months Ended
	Dec. 31, 2021
Leases [Abstract]
Schedule of acquired lease intangibles included in other assets and other liabilities	The following summarizes our acquired lease intangibles, which are included in other assets and other liabilities and deferred credits (in thousands): December 31, 2021 December 31, 2020 In-place leases $ 67,215 $ 60,965 Accumulated amortization (38,130) (34,758) Above market leases 2,532 5,389 Accumulated amortization (2,383) (5,268) Acquired lease intangible assets, net $ 29,234 $ 26,328 Below market leases $ 58,655 $ 56,677 Accumulated accretion (36,253) (35,219) Acquired lease intangible liabilities, net $ 22,402 $ 21,458 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, 2021 2020 2019 Amortization of in-place leases $ (6,664) $ (5,018) $ (4,762) Amortization of above market leases (34) (62) (345) Amortization of below market leases 3,271 3,994 4,131 $ (3,427) $ (1,086) $ (976)
Future Amortization for Acquired In-Place Leases	As of December 31, 2021, the amortization for acquired leases during the next five years and thereafter, assuming no early lease terminations, is as follows (in thousands): In-Place Above Market Below Market Year Ending December 31, 2022 $ 6,734 $ 41 $ 3,171 2023 4,456 41 2,896 2024 4,146 38 2,581 2025 3,580 25 2,169 2026 3,287 4 1,767 Thereafter 6,882 — 9,818 $ 29,085 $ 149 $ 22,402

Fair Value of Financial Instr_2

Fair Value of Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2021
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, 2021 December 31, 2020 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Deferred compensation liability $ — $ 2,503 $ — $ 2,503 $ — $ 2,059 $ — $ 2,059 Interest rate swap liability $ — $ 1,807 $ — $ 1,807 $ — $ 4,531 $ — $ 4,531
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, 2021 December 31, 2020 Carrying Value Fair Value Carrying Value Fair Value Secured notes payable $ 110,965 $ 113,207 $ 110,923 $ 114,074 Unsecured term loan $ 249,654 $ 250,000 $ 249,233 $ 250,000 Unsecured senior guaranteed notes $ 797,953 $ 832,795 $ 947,444 $ 1,017,378 Senior unsecured notes, net $ 490,631 $ 503,000 $ — $ — Unsecured line of credit $ — $ — $ 99,151 $ 100,000

Other Assets (Tables)

Other Assets (Tables)	12 Months Ended
	Dec. 31, 2021
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, 2021 December 31, 2020 Leasing commissions, net of accumulated amortization of $40,595 and $35,167, respectively $ 38,589 $ 38,173 Acquired above market leases, net 149 121 Acquired in-place leases, net 29,085 26,207 Lease incentives, net of accumulated amortization of $913 and $802, respectively 595 994 Other intangible assets, net of accumulated amortization of $1,382 and $1,213, respectively 2,445 2,565 Right-of-use lease asset, net 26,254 29,350 Prepaid expenses, deposits and other 9,136 8,702 Total other assets $ 106,253 $ 106,112

Other Liabilities and Deferre_2

Other Liabilities and Deferred Credits (Tables)	12 Months Ended
	Dec. 31, 2021
Other Liabilities Disclosure [Abstract]
Other liabilities and deferred credits	Other liabilities and deferred credits consist of the following (in thousands): December 31, 2021 December 31, 2020 Acquired below market leases, net $ 22,402 $ 21,458 Prepaid rent and deferred revenue 16,309 14,518 Interest rate swap liability 1,807 4,531 Straight-line rent liability 14,274 18,049 Deferred rent expense and lease intangible 3 16 Deferred compensation 2,503 2,059 Deferred tax liability 967 570 Lease liability 27,917 30,060 Other liabilities 33 39 Total other liabilities and deferred credits, net $ 86,215 $ 91,300

Debt (Tables)

Debt (Tables)	12 Months Ended
	Dec. 31, 2021
Debt Disclosure [Abstract]
Summary of notes payable outstanding	The following is a summary of the Operating Partnership's total secured notes payable outstanding as of December 31, 2021 and December 31, 2020 (in thousands): Description of Debt Principal Balance as of Stated Interest Rate Stated Maturity Date December 31, 2021 December 31, 2020 as of December 31, 2021 City Center Bellevue (1) 111,000 111,000 3.98 % November 1, 2022 111,000 111,000 Debt issuance costs, net of accumulated amortization of $387 and $345, respectively (35) (77) Total Secured Notes Payable $ 110,965 $ 110,923 (1) Interest only. The following is a summary of the Operating Partnership's total unsecured notes payable outstanding as of December 31, 2021 and December 31, 2020 (in thousands): Description of Debt Principal Balance as of Stated Interest Rate Stated Maturity Date December 31, 2021 December 31, 2020 as of December 31, 2021 Term Loan A $ 100,000 $ 100,000 Variable (1) January 9, 2022 (2) Senior Guaranteed Notes, Series A (3) — 150,000 4.04 % (4) October 31, 2021 Term Loan B 100,000 100,000 Variable (5) March 1, 2023 Term Loan C 50,000 50,000 Variable (6) March 1, 2023 Senior Guaranteed Notes, Series F 100,000 100,000 3.78 % (7) 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 % (8) March 1, 2027 Senior Guaranteed Notes, Series E 100,000 100,000 4.24 % (9) May 23, 2029 Senior Guaranteed Notes, Series G 150,000 150,000 3.91 % (10) July 30, 2030 3.375% Senior Unsecured Notes 500,000 — 3.38 % February 1, 2031 1,550,000 1,200,000 Debt discount and issuance costs, net of accumulated amortization of $9,462 and $8,856, respectively (11,762) (3,323) Total Unsecured Notes Payable $ 1,538,238 $ 1,196,677 (1) As of December 31, 2021, the interest rate associated with Term Loan A was variable. However, on January 14, 2022, the Operating Partnership entered into an interest rate swap agreement that is intended to fix the interest rate associated with the 2022 Term Loan A at approximately 2.80% through January 5, 2027, subject to adjustments based on our consolidated leverage ratio. (2) On January 5, 2022, we extended the 2022 Term Loan A to a maturity date of January 5, 2027 with no further extension options. (3) Notes prepaid in full, with make-whole penalty thereon of approximately $3.9 million, on January 26, 2021. (4) The company entered into a one month forward-starting seven years 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. On January 26, 2021, we prepaid the entirety of the Senior Guaranteed Notes, Series A with make-whole premium thereon and the related swap contract was fully amortized and terminated. (5) 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. Effective March 1, 2018, the effective interest rate associated with Term Loan B is approximately 2.65%, subject to adjustments based on our consolidated leverage ratio. (6) 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. Effective March 1, 2018, the effective interest rate associated with Term Loan C is approximately 2.64%, subject to adjustments based on our consolidated leverage ratio. (7) 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. (8) 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. (9) 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. (10) The Operating Partnership entered into a treasury lock contract on June 20, 2019, which was settled on July 17, 2019 at a gain 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 3.88% per annum.
Scheduled principal payments on notes payable	Scheduled principal payments on secured and unsecured notes payable as of December 31, 2021 are as follows (in thousands): 2022 (1) $ 211,000 2023 150,000 2024 100,000 2025 200,000 2026 — Thereafter 1,000,000 $ 1,661,000

Derivative and Hedging (Tables)

Derivative and Hedging (Tables)	12 Months Ended
	Dec. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Interest Rate Derivatives	The following is a summary of the terms of the interest rate swaps as of December 31, 2021 (dollars in thousands): Swap Counterparty Notional Amount Effective Date Maturity Date Fair Value U.S. Bank N.A. $ 100,000 3/1/2016 3/1/2023 $ (1,206) Wells Fargo Bank, N.A. $ 50,000 5/2/2016 3/1/2023 $ (601)

Equity of American Assets Tru_2

Equity of American Assets Trust, Inc. (Tables)	12 Months Ended
	Dec. 31, 2021
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, 2021, 2020 and 2019: Period Amount per Share/Unit Period Covered Dividend Paid Date First Quarter 2019 $ 0.28 January 1, 2019 to March 31, 2019 March 28, 2019 Second Quarter 2019 $ 0.28 April 1, 2019 to June 30, 2019 June 27, 2019 Third Quarter 2019 $ 0.28 July 1, 2019 to September 30, 2019 September 26, 2019 Fourth Quarter 2019 $ 0.30 October 1, 2019 to December 31, 2019 December 26, 2019 First Quarter 2020 $ 0.30 January 1, 2020 to March 31, 2020 March 26, 2020 Second Quarter 2020 $ 0.20 April 1, 2020 to June 30, 2020 June 25, 2020 Third Quarter 2020 $ 0.25 July 1, 2020 to September 30, 2020 September 24, 2020 Fourth Quarter 2020 $ 0.25 October 1, 2020 to December 31, 2020 December 24, 2020 First Quarter 2021 $ 0.28 January 1, 2021 to March 31, 2021 March 25, 2021 Second Quarter 2021 $ 0.28 April 1, 2021 to June 30, 2021 June 24, 2021 Third Quarter 2021 $ 0.30 July 1, 2021 to September 30, 2021 September 23, 2021 Fourth Quarter 2021 $ 0.30 October 1, 2021 to December 31, 2021 December 23, 2021
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, 2021 2020 2019 Per Share % Per Share % Per Share % Ordinary income $ 0.73 62.6 % $ 0.66 66.0 % $ 1.09 95.6 % Capital gain — — % — — % — — % Return of capital 0.43 37.4 % 0.34 34.0 % 0.05 4.4 % Total $ 1.16 100.0 % $ 1.00 100.0 % $ 1.14 100.0 %
Schedule of restricted common stock	The following shares of restricted common stock have been issued as of December 31, 2021: Grant Fair Value at Grant Date Number June 11, 2019 (1) $45.35 4,412 December 9, 2019 (2) $28.06 - $30.97 168,596 June 9, 2020 (1) $33.29 6,008 December 4, 2020 (3) $19.02 - $20.83 311,566 June 8, 2021 (1) 38.59 5,184 December 9, 2021 (4) $24.27 - $25.17 224,635 (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 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, 2020, 2021 and 2022, 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 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, 2021, 2022 and 2023, 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, 2021: 2021 Units Weighted Average Grant Date Fair Value Balance at beginning of year 491,957 $ 23.53 Granted 229,819 25.04 Vested (78,989) 25.00 Forfeited (155,390) 24.25 Balance at end of year 487,397 $ 23.78
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, 2021 2020 2019 NUMERATOR Net income $ 36,593 $ 35,588 $ 60,188 Less: Net income attributable to restricted shares (564) (383) (381) Less: Income attributable to unitholders in the Operating Partnership (7,653) (7,545) (14,089) Net income attributable to common stockholders—basic $ 28,376 $ 27,660 $ 45,718 Income attributable to American Assets Trust, Inc. common stockholders—basic $ 28,376 $ 27,660 $ 45,718 Plus: Income attributable to unitholders in the Operating Partnership 7,653 7,545 14,089 Net income attributable to common stockholders—diluted $ 36,029 $ 35,205 $ 59,807 DENOMINATOR Weighted average common shares outstanding—basic 59,990,740 59,806,309 54,110,949 Effect of dilutive securities—conversion of Operating Partnership units 16,181,537 16,313,454 16,675,183 Weighted average common shares outstanding—diluted 76,172,277 76,119,763 70,786,132 Earnings per common share, basic $ 0.47 $ 0.46 $ 0.84 Earnings per common share, diluted $ 0.47 $ 0.46 $ 0.84

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Income tax provision	The income tax provision included in other (expense) income on the consolidated statement of comprehensive income is as follows (in thousands): Year Ended December 31, 2021 2020 2019 Current: Federal $ — $ (542) $ 48 State 483 412 625 Deferred: Federal 118 (80) 237 State 137 201 (91) Provision for income taxes (benefit) $ 738 $ (9) $ 819

LEASES (Tables)

LEASES (Tables)	12 Months Ended
	Dec. 31, 2021
Leases [Abstract]
Current minimum annual payments under the leases	Current annual payments under the operating leases are as follows, as of December 31, 2021 (in thousands): Year Ending December 31, 2022 $ 3,232 2023 3,328 2024 3,428 2025 3,531 2026 3,584 Thereafter 16,126 Total lease payments $ 33,229 Imputed interest (5,312) Present value of lease liability $ 27,917
Lease costs under operating leases and supplemental cash flow information of leases	Lease costs under the operating leases are as follows (in thousands): Year Ended December 31, 2021 2020 Operating lease cost $ 3,926 $ 3,902 Sublease income (3,634) (4,297) Total lease (income) cost $ 292 $ (395) Weighted-average remaining lease term - operating leases (in years) 9.5 Weighted-average discount rate - operating leases 3.19 % Supplemental cash flow information and non-cash activity related to our operating leases are as follow (in thousands): Year Ended December 31, 2021 2020 Operating cash flow information: Cash paid for amounts included in the measurement of lease liabilities $ 2,791 $ 3,422 Non-cash activity: Right-of-use assets obtained in exchange for operating lease obligations $ — $ 27,321
Lessor, Operating Lease, Payment to be Received, Fiscal Year Maturity	As of December 31, 2021, 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): 2022 $ 235,625 2023 221,814 2024 190,860 2025 167,588 2026 152,488 Thereafter 370,926 Total $ 1,339,301

Component of Rental Income an_2

Component of Rental Income and Expense (Tables)	12 Months Ended
	Dec. 31, 2021
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, 2021 2020 2019 Minimum rents Office $ 180,704 $ 170,853 $ 136,118 Retail 89,326 82,176 99,601 Multifamily 48,654 47,071 47,448 Mixed-Use 9,901 7,302 15,702 Percentage rent 4,337 3,516 2,476 Hotel revenue 24,935 17,209 40,297 Other 2,351 2,185 2,223 Total rental income $ 360,208 $ 330,312 $ 343,865
Principal components of rental expenses	The principal components of rental expenses are as follows (in thousands): Year Ended December 31, 2021 2020 2019 Rental operating $ 41,488 $ 38,194 $ 38,331 Hotel operating 17,518 13,691 24,522 Repairs and maintenance 18,113 17,813 17,035 Marketing 1,779 2,023 2,538 Rent 4,023 3,955 3,372 Hawaii excise tax 2,792 2,479 4,160 Management fees 1,267 1,023 2,009 Total rental expenses $ 86,980 $ 79,178 $ 91,967

Other Income (Expenses) (Tables

Other Income (Expenses) (Tables)	12 Months Ended
	Dec. 31, 2021
Other Income and Expenses [Abstract]
Principal components of other income (expense), net	The principal components of other (expense) income, net are as follows (in thousands): Year Ended December 31, 2021 2020 2019 Interest and investment income $ 324 $ 436 $ 696 Income tax (expense) benefit (738) 9 (819) Other non-operating (expense) income (4) 2 1 Total other (expense) income $ (418) $ 447 $ (122)

Segment Reporting (Tables)

Segment Reporting (Tables)	12 Months Ended
	Dec. 31, 2021
Segment Reporting [Abstract]
Schedule of segments operating activity	The following table represents operating activity within our reportable segments (in thousands): Year Ended December 31, 2021 2020 2019 Total Office Property revenue $ 186,366 $ 177,554 $ 144,683 Property expense (50,233) (47,424) (42,234) Segment profit 136,133 130,130 102,449 Total Retail Property revenue 94,662 88,280 107,604 Property expense (27,983) (27,374) (30,633) Segment profit 66,679 60,906 76,971 Total Multifamily Property revenue 52,315 50,327 51,066 Property expense (23,211) (22,074) (20,863) Segment profit 29,104 28,253 30,203 Total Mixed-Use Property revenue 42,485 28,412 63,388 Property expense (28,347) (24,247) (38,250) Segment profit 14,138 4,165 25,138 Total segments’ profit $ 246,054 $ 223,454 $ 234,761
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, 2021 2020 2019 Total segments' profit $ 246,054 $ 223,454 $ 234,761 General and administrative (29,879) (26,581) (24,871) Depreciation and amortization (116,306) (108,292) (96,205) Interest expense (58,587) (53,440) (54,008) Loss on early extinguishment of debt (4,271) — — Gain on sale of real estate — — 633 Other (expense) income, net (418) 447 (122) Net income 36,593 35,588 60,188 Net income attributable to restricted shares (564) (383) (381) Net income attributable to unitholders in the Operating Partnership (7,653) (7,545) (14,089) Net income attributable to American Assets Trust, Inc. stockholders $ 28,376 $ 27,660 $ 45,718
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, 2021 December 31, 2020 Net real estate Office $ 1,536,212 $ 1,317,107 Retail 591,107 607,918 Multifamily 381,315 389,804 Mixed-Use 173,347 177,905 $ 2,681,981 $ 2,492,734 Secured Notes Payable (1) Office $ 111,000 $ 111,000 Retail — — $ 111,000 $ 111,000 Capital Expenditures (2) Office $ 93,116 $ 52,882 Retail 7,232 8,596 Multifamily 5,841 3,897 Mixed-Use 1,541 3,702 $ 107,730 $ 69,077 (1) Excludes unamortized debt issuance costs of $0.0 million and $0.1 million as of December 31, 2021 and 2020, 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, 2021
Quarterly Financial Information Disclosure [Abstract]
Selected Quarterly Information	The tables below reflect selected American Assets Trust, Inc. quarterly information for 2021 and 2020 (in thousands, except per shares data): Three Months Ended December 31, September 30, June 30, March 31, Total revenue $ 101,747 $ 98,286 $ 91,809 $ 83,986 Operating income 25,715 27,669 26,423 20,062 Net income 10,478 12,895 11,487 1,733 Net income attributable to restricted shares (147) (145) (135) (137) Net income attributable to unitholders in the Operating Partnership (2,194) (2,709) (2,411) (339) Net income attributable to American Assets Trust, Inc. stockholders $ 8,137 $ 10,041 $ 8,941 $ 1,257 Net income per share attributable to common stockholders - basic and diluted $ 0.14 $ 0.17 $ 0.15 $ 0.02 Three Months Ended December 31, September 30, June 30, March 31, Total revenue $ 81,347 $ 84,374 $ 82,109 $ 96,743 Operating income 16,415 20,323 22,995 28,848 Net income 3,788 6,490 9,826 15,484 Net income attributable to restricted shares (123) (87) (69) (104) Net income attributable to unitholders in the Operating Partnership (767) (1,365) (2,101) (3,312) Net income attributable to American Assets Trust, Inc. stockholders $ 2,898 $ 5,038 $ 7,656 $ 12,068 Net income per share attributable to common stockholders - basic and diluted $ 0.05 $ 0.08 $ 0.13 $ 0.20 The tables below reflect selected American Assets Trust, L.P. quarterly information for 2021 and 2020 (in thousands, except per shares data): Three Months Ended December 31, September 30, June 30, March 31, Total revenue $ 101,747 $ 98,286 $ 91,809 $ 83,986 Operating income 25,715 27,669 26,423 20,062 Net income 10,478 12,895 11,487 1,733 Net income attributable to restricted shares (147) (145) (135) (137) Net income attributable to American Assets Trust, L.P. unit holders $ 10,331 $ 12,750 $ 11,352 $ 1,596 Net income per unit attributable to unit holders - basic and diluted $ 0.14 $ 0.17 $ 0.15 $ 0.02 Three Months Ended December 31, September 30, June 30, March 31, Total revenue $ 81,347 $ 84,374 $ 82,109 $ 96,743 Operating income 16,415 20,323 22,995 28,848 Net income 3,788 6,490 9,826 15,484 Net income attributable to restricted shares (123) (87) (69) (104) Net income attributable to American Assets Trust, L.P. unit holders $ 3,665 $ 6,403 $ 9,757 $ 15,380 Net income per unit attributable to common unit holders - basic and diluted $ 0.05 $ 0.08 $ 0.13 $ 0.20

Summary of Significant Accoun_4

Summary of Significant Accounting Policies (Details)	12 Months Ended
	Dec. 31, 2021USD ($)EmployeeSegmentPropertyRoom	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Summary Of Significant Accounting Policies [Line Items]
Document Period End Date	Dec. 31, 2021
Number of employees | Employee	208
Number of office, retail, multifamily and mixed-use operating properties | Property	30
Properties held for development | Property	3
Allowance for doubtful accounts	$ (4,600,000)	$ (10,000,000)
Total bad debt expense	2,300,000	18,400,000	$ 1,800,000
Real estate depreciation expense	$ 102,000,000	95,800,000	85,300,000
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	62,200,000	33,000,000
Restricted cash	0	1,716,000	10,148,000
Incremental stock compensation cost from modification	$ 2,600,000	1,200,000	0
Number of operating segments | Segment	4
Rooms in mixed-use segment all-suite hotel | Room	369
Right-of-use asset, net	$ 26,254,000	29,350,000
Straight-line rent liability	14,274,000	18,049,000
Lease liability	27,917,000	30,060,000
Money Market Funds
Summary Of Significant Accounting Policies [Line Items]
Cash balance at banks, excess of FDIC insured limit	$ 70,800,000	97,800,000
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
Other Income
Summary Of Significant Accounting Policies [Line Items]
General excise tax recognized, gross	$ 2,500,000	$ 2,300,000	$ 3,500,000

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, 2021	Dec. 31, 2020	Dec. 31, 2019
Supplemental cash flow information
Total interest costs incurred	$ 61,578	$ 54,510	$ 54,636
Interest capitalized	2,991	1,070	628
Interest expense	58,587	53,440	54,008
Cash paid for interest, net of amounts capitalized	50,970	53,467	51,975
Cash paid for income taxes	356	844	971
Supplemental schedule of noncash investing and financing activities
Accounts payable and accrued liabilities for construction in progress	18,697	22,884	25,413
Accrued leasing commissions	2,628	555	3,345
Building recorded in termination of ground lease	$ 0	$ 0	$ 4,518

Real Estate (Details)

Real Estate (Details) $ in Thousands	Jun. 20, 2019USD ($)ft²	May 22, 2019USD ($)	Dec. 31, 2021USD ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Real Estate [Line Items]
Proceeds from sale of real estate, net of selling costs			$ 0	$ 0	$ 8,191
Real Estate [Line Items]
Proceeds from sale of real estate, net of selling costs			0	0	8,191
Solana Beach Highway 101 Land
Real Estate [Line Items]
Sales price of property sold		$ 9,400
Proceeds from sale of real estate, net of selling costs		9,400
Gain on sale of real estate			0	0	600
Real Estate [Line Items]
Gain on sale of real estate			$ 0	$ 0	$ 600
Sales price of property sold		9,400
Proceeds from sale of real estate, net of selling costs		$ 9,400
La Jolla Commons
Real Estate [Line Items]
Purchase price consideration	$ 525,000
Purchase Price Seller Credits - Speculative Lease-up	11,500
Purchase Price Seller Credits - Assumed Contractual Liabilities	4,200
Purchase Price Seller Credits - Closing Prorations	1,700
Acquisition cost capitalized	$ 200
Area of real estate property | ft²	724,000

Real Estate Summary of Real Est

Real Estate Summary of Real Estate Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Real Estate Properties [Line Items]
Construction in progress	$ 139,098	$ 91,047
Total Real estate, at cost	3,529,371	3,246,874
Accumulated depreciation	(847,390)	(754,140)
Net real estate	2,681,981	2,492,734
Total Retail
Real Estate Properties [Line Items]
Net real estate	591,107	607,918
Total Office
Real Estate Properties [Line Items]
Net real estate	1,536,212	1,317,107
Total Multifamily
Real Estate Properties [Line Items]
Net real estate	381,315	389,804
Total Mixed-Use
Real Estate Properties [Line Items]
Net real estate	173,347	177,905
Real Estate Investment
Real Estate Properties [Line Items]
Land	687,582	628,557
Buildings	2,320,332	2,184,934
Land improvements	72,064	69,049
Tenant improvements	310,525	276,639
Furniture, fixtures, and equipment	39,556	36,436
Construction in progress	99,312	51,259
Total Real estate, at cost	3,529,371	3,246,874
Accumulated depreciation	(847,390)	(754,140)
Net real estate	2,681,981	2,492,734
Real Estate Investment | Total Retail
Real Estate Properties [Line Items]
Land	254,016	254,016
Buildings	527,262	526,522
Land improvements	47,425	47,425
Tenant improvements	89,520	88,326
Furniture, fixtures, and equipment	1,098	1,069
Construction in progress	7,160	5,170
Total Real estate, at cost	926,481	922,528
Accumulated depreciation	(335,374)	(314,610)
Net real estate	591,107	607,918
Real Estate Investment | Total Office
Real Estate Properties [Line Items]
Land	284,263	225,238
Buildings	1,270,131	1,137,711
Land improvements	14,269	11,672
Tenant improvements	218,639	186,423
Furniture, fixtures, and equipment	5,003	3,236
Construction in progress	87,340	43,595
Total Real estate, at cost	1,879,645	1,607,875
Accumulated depreciation	(343,433)	(290,768)
Net real estate	1,536,212	1,317,107
Real Estate Investment | Total Multifamily
Real Estate Properties [Line Items]
Land	72,668	72,668
Buildings	393,713	392,224
Land improvements	7,764	7,346
Tenant improvements	0	0
Furniture, fixtures, and equipment	18,039	16,480
Construction in progress	4,448	1,831
Total Real estate, at cost	496,632	490,549
Accumulated depreciation	(115,317)	(100,745)
Net real estate	381,315	389,804
Real Estate Investment | Total Mixed-Use
Real Estate Properties [Line Items]
Land	76,635	76,635
Buildings	129,226	128,477
Land improvements	2,606	2,606
Tenant improvements	2,366	1,890
Furniture, fixtures, and equipment	15,416	15,651
Construction in progress	364	663
Total Real estate, at cost	226,613	225,922
Accumulated depreciation	(53,266)	(48,017)
Net real estate	$ 173,347	$ 177,905

Real Estate Property Asset Acqu

Real Estate Property Asset Acquisitions (Details) $ in Thousands	Sep. 10, 2021USD ($)ft²	Jul. 07, 2021USD ($)ft²	Jun. 20, 2019USD ($)ft²	Dec. 31, 2021USD ($)	Sep. 30, 2021USD ($)	Jun. 30, 2021USD ($)	Mar. 31, 2021USD ($)	Dec. 31, 2020USD ($)	Sep. 30, 2020USD ($)	Jun. 30, 2020USD ($)	Mar. 31, 2020USD ($)	Dec. 31, 2021USD ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Real Estate [Line Items]
Acquired in-place leases, net				$ 29,085				$ 26,207				$ 29,085	$ 26,207
Prepaid expenses, deposits and other				9,136				8,702				9,136	8,702
TOTAL ASSETS				3,017,927				2,817,309				3,017,927	2,817,309
Accounts payable and accrued expenses				64,531				59,262				64,531	59,262
Security deposits payable				7,855				6,590				7,855	6,590
Other liabilities and deferred credits				86,215				91,300				86,215	91,300
Liabilities				1,807,804				1,563,903				1,807,804	1,563,903
Total revenue				101,747	$ 98,286	$ 91,809	$ 83,986	81,347	$ 84,374	$ 82,109	$ 96,743	375,828	344,573	$ 366,741
Operating Expenses												(275,959)	(255,992)	(253,056)
Operating income (loss)				25,715	27,669	26,423	20,062	16,415	20,323	22,995	28,848	99,869	88,581	113,685
Net income				10,478	$ 12,895	$ 11,487	$ 1,733	$ 3,788	$ 6,490	$ 9,826	$ 15,484	36,593	$ 35,588	$ 60,188
La Jolla Commons
Real Estate [Line Items]
Area of real estate property | ft²			724,000
Purchase price consideration			$ 525,000
Acquisition cost capitalized			200
Purchase Price Seller Credits - Speculative Lease-up			11,500
Purchase Price Seller Credits - Assumed Contractual Liabilities			4,200
Purchase Price Seller Credits - Closing Prorations			$ 1,700
Eastgate Office Park And Corporate Campus East III
Real Estate [Line Items]
Total revenue												7,048
Operating Expenses												(7,366)
Operating income (loss)												(318)
Net income												(321)
Eastgate Office Park
Real Estate [Line Items]
Total revenue												5,139
Operating Expenses												(5,235)
Operating income (loss)												(96)
Net income												(99)
Area of real estate property | ft²		280,000
Purchase price consideration		$ 125,000
Acquisition cost capitalized		$ 200
Eastgate Office Park | Office Building
Real Estate [Line Items]
Land				35,822								35,822
Buildings				76,692								76,692
Land improvements				1,740								1,740
Fixtures and Equipment, Gross				4,305								4,305
Total real estate				118,559								118,559
Acquired in-place leases, net				7,023								7,023
Prepaid expenses, deposits and other				8								8
TOTAL ASSETS				125,590								125,590
Accounts payable and accrued expenses				31								31
Security deposits payable				513								513
Other liabilities and deferred credits				535								535
Liabilities				1,079								$ 1,079
Eastgate Office Park | Office Building | Acquired lease intangible assets
Real Estate [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life												3 years 2 months 12 days
Corporate Campus East III
Real Estate [Line Items]
Total revenue												$ 1,909
Operating Expenses												(2,131)
Operating income (loss)												(222)
Net income												(222)
Area of real estate property | ft²	161,000
Purchase price consideration	$ 84,000
Acquisition cost capitalized	100
Corporate Campus East III | Office Building
Real Estate [Line Items]
Land				23,203								23,203
Buildings				52,234								52,234
Land improvements				667								667
Fixtures and Equipment, Gross				3,091								3,091
Total real estate				79,195								79,195
Acquired in-place leases, net				5,341								5,341
Prepaid expenses, deposits and other				13								13
TOTAL ASSETS				84,549								84,549
Accounts payable and accrued expenses				9								9
Security deposits payable				310								310
Other liabilities and deferred credits				3,844								3,844
Liabilities				$ 4,163								$ 4,163
Purchase Price Seller Credits, Future Rent Abatement	1,100
Purchase Price Seller Credits, Contractual Tenant Improvements	$ 2,100
Corporate Campus East III | Office Building | Acquired lease intangible assets
Real Estate [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life												5 years 2 months 12 days

Acquired In-Place Leases and _3

Acquired In-Place Leases and Above/Below Market Leases Summary of Acquired Lease Intangibles (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets, Gross [Abstract]
Acquired lease intangible assets	$ 149	$ 121
Net of accumulated amortization of other intangible assets	(1,382)	(1,213)
Below Market Lease [Abstract]
Below market leases	58,655	56,677
Accumulated accretion	(36,253)	(35,219)
Acquired lease intangible liabilities, net	22,402	21,458
Acquired lease, below market renewal options	11,500
In-place leases
Finite-Lived Intangible Assets, Gross [Abstract]
Acquired lease intangible assets	67,215	60,965
Net of accumulated amortization of other intangible assets	(38,130)	(34,758)
Acquired lease intangible assets, net	29,085
Above market leases
Finite-Lived Intangible Assets, Gross [Abstract]
Acquired lease intangible assets	2,532	5,389
Net of accumulated amortization of other intangible assets	(2,383)	(5,268)
Acquired lease intangible assets, net	149
Acquired lease intangible assets
Finite-Lived Intangible Assets, Gross [Abstract]
Acquired lease intangible assets, net	$ 29,234	$ 26,328

Acquired In-Place Leases and _4

Acquired In-Place Leases and Above/Below Market Leases (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization of acquired above and below market leases	$ 3.2	$ 3.9	$ 3.8
Weighted-average amortization period of below market leases	10 years 6 months
Acquired lease, below market renewal options	$ 11.5
Weighted-average amortization period of acquired leases prior to the commencement of renewal option	7 years 8 months 12 days
In-place leases
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted-average amortization period of acquired leases	5 years 9 months 18 days
Above market leases
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted-average amortization period of acquired leases	3 years 8 months 12 days

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, 2021	Dec. 31, 2020	Dec. 31, 2019
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization of below market leases	$ 3,271	$ 3,994	$ 4,131
Operating Lease, Right-of-Use Asset, Amortization Expense	3,427	1,086	976
In-place leases
Acquired Finite-Lived Intangible Assets [Line Items]
Operating Lease, Right-of-Use Asset, Amortization Expense	6,664	5,018	4,762
Above market leases
Acquired Finite-Lived Intangible Assets [Line Items]
Operating Lease, Right-of-Use Asset, Amortization Expense	$ 34	$ 62	$ 345

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, 2021	Dec. 31, 2020
Below Market Lease, Net, Amortization Income, Fiscal Year Maturity [Abstract]
2022	$ 3,171
2023	2,896
2024	2,581
2025	2,169
2026	1,767
Thereafter	9,818
Acquired lease intangible liabilities, net	22,402	$ 21,458
In-place leases
Acquired Finite-Lived Intangible Assets [Line Items]
2022	6,734
2023	4,456
2024	4,146
2025	3,580
2026	3,287
Thereafter	6,882
Acquired lease intangible assets, net	29,085
Above market leases
Acquired Finite-Lived Intangible Assets [Line Items]
2022	41
2023	41
2024	38
2025	25
2026	4
Thereafter	0
Acquired lease intangible assets, net	$ 149

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, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation liability	$ 2,503	$ 2,059
Interest rate swap liability	1,807	4,531
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 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 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	2,503	2,059
Interest rate swap liability	$ 1,807	$ 4,531

Fair Value of Financial Instr_4

Fair Value of Financial Instruments (Details) - Fair Value, Inputs, Level 2	Dec. 31, 2021
Minimum
Fair Value Inputs Disclosures
Fair value assumptions, interest rate	0.021
Maximum
Fair Value Inputs Disclosures
Fair value assumptions, interest rate	0.037

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, 2021	Dec. 31, 2020
Secured notes payable | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	$ 110,965	$ 110,923
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	113,207	114,074
Unsecured debt | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	249,654	249,233
Unsecured debt | Carrying Value | 3.375% Senior Unsecured Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	490,631	0
Unsecured debt | 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	250,000	250,000
Unsecured debt | Estimate of Fair Value Measurement | Fair Value, Inputs, Level 2 | 3.375% Senior Unsecured Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	503,000	0
Unsecured senior guaranteed notes | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	797,953	947,444
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	832,795	1,017,378
Unsecured line of credit | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	0	99,151
Unsecured line of credit | 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	$ 0	$ 100,000

Other Assets (Details)

Other Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Leasing commissions, net of accumulated amortization of $40,595 and $35,167, respectively	$ 38,589	$ 38,173
Acquired above market leases, net	149	121
Acquired in-place leases, net	29,085	26,207
Lease incentives, net of accumulated amortization of $913 and $802, respectively	595	994
Other intangible assets, net of accumulated amortization of $1,382 and $1,213, respectively	2,445	2,565
Right-of-use asset, net	26,254	29,350
Prepaid expenses, deposits and other	9,136	8,702
Total other assets	106,253	106,112
Leasing commissions, accumulative amortization	(40,595)	(35,167)
Lease incentives, accumulated amortization	(913)	(802)
Other intangible assets, accumulated amortization	$ 1,382	$ 1,213
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Total other assets	Total other assets
Right-of-use asset, net	$ 26,254	$ 29,350

Other Liabilities and Deferre_3

Other Liabilities and Deferred Credits (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Other Liabilities Disclosure [Abstract]
Acquired below market leases, net	$ 22,402	$ 21,458
Prepaid rent and deferred revenue	16,309	14,518
Interest rate swap liability	1,807	4,531
Straight-line rent liability	14,274	18,049
Deferred rent expense and lease intangible	3	16
Deferred compensation	2,503	2,059
Deferred tax liability	967	570	$ 600
Lease liability	27,917	30,060
Other liabilities	33	39
Total other liabilities and deferred credits, net	$ 86,215	$ 91,300
Operating Lease, Liability, Statement of Financial Position [Extensible List]	Total other liabilities and deferred credits, net	Total other liabilities and deferred credits, net

Debt Summary of Total Secured N

Debt Summary of Total Secured Notes Payable Outstanding (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Notes payable, total	$ 1,661,000
Secured notes payable | American Assets Trust, L.P.
Debt Instrument [Line Items]
Long-term Debt, Principal Balance	111,000	$ 111,000
Debt issuance costs, net	(35)	(77)
Notes payable, total	110,965	110,923
Secured notes payable | American Assets Trust, L.P. | City Center Bellevue
Debt Instrument [Line Items]
Long-term Debt, Principal Balance	$ 111,000	111,000
Stated Interest Rate	3.98%
Stated Maturity Date	Nov. 1, 2022
Unsecured debt
Debt Instrument [Line Items]
Debt issuance costs, accumulated amortization	$ 387	345
Unsecured debt | American Assets Trust, L.P.
Debt Instrument [Line Items]
Long-term Debt, Principal Balance	1,550,000	1,200,000
Debt issuance costs, net	(11,762)	(3,323)
Debt issuance costs, accumulated amortization	$ 9,462	$ 8,856

Debt Summary of Total Unsecured

Debt Summary of Total Unsecured Notes Payable Outstanding (Details)

Jan. 26, 2021USD ($)

Oct. 01, 2020USD ($)

Jul. 17, 2019USD ($)

Jan. 09, 2019Extension_Option

Jun. 23, 2017USD ($)

May 31, 2017

May 11, 2017USD ($)

Apr. 25, 2017

Jan. 18, 2017USD ($)

May 02, 2016

Apr. 07, 2016

Mar. 29, 2016

Mar. 23, 2016

Mar. 01, 2016

Jan. 29, 2016

Sep. 19, 2014USD ($)

Dec. 31, 2021USD ($)

Dec. 31, 2020USD ($)

Dec. 31, 2019USD ($)

Jul. 30, 2019USD ($)

Dec. 31, 2018

Jan. 09, 2018

Jul. 19, 2017

May 23, 2017

Mar. 01, 2017

Jan. 09, 2014USD ($)

Debt Instrument [Line Items]

Unsecured notes payable

$ 1,538,238,000

$ 1,196,677,000

Repayments of Unsecured Debt

155,375,000

0

$ 0

Loss on early extinguishment of debt

(4,271,000)

0

0

Repayment of unsecured line of credit

100,000,000

0

123,000,000

American Assets Trust, L.P.

Debt Instrument [Line Items]

Unsecured notes payable

1,538,238,000

1,196,677,000

Repayments of Unsecured Debt

155,375,000

0

0

Loss on early extinguishment of debt

(4,271,000)

0

0

Repayment of unsecured line of credit

$ 100,000,000

0

$ 123,000,000

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

Debt Instrument [Line Items]

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

$ 0

$ 500,000

$ 700,000

$ 10,400,000

$ 1,600,000

Loss on derivatives

$ 500,000

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

Debt Instrument [Line Items]

Unsecured notes payable

$ 100,000,000

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

Debt Instrument [Line Items]

Fixed interest rate on derivative

4.13%

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

Debt Instrument [Line Items]

Effective interest rate (percent)

3.88%

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%

2.65%

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%

2.64%

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%

Senior Guaranteed Notes, Series G [Member] | American Assets Trust, L.P. | Forward Contracts

Debt Instrument [Line Items]

Effective interest rate (percent)

3.88%

3.375% Senior Unsecured Notes | American Assets Trust, L.P.

Debt Instrument [Line Items]

Stated Interest Rate

3.375%

Note Offering Percent

0.98935

Debt Securities, Held-to-Maturity, Weighted Average Yield, Maturity, after Year 10

3.502%

Proceeds from Debt, Net of Issuance Costs

$ 489,700,000

Unsecured debt

Debt Instrument [Line Items]

Debt issuance costs, accumulated amortization

$ 387,000

345,000

Unsecured debt | American Assets Trust, L.P.

Debt Instrument [Line Items]

Long-term Debt, Principal Balance

1,550,000,000

1,200,000,000

Debt issuance costs, net

(11,762,000)

(3,323,000)

Unsecured notes payable

1,538,238,000

1,196,677,000

Debt issuance costs, accumulated amortization

9,462,000

8,856,000

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

Debt Instrument [Line Items]

Long-term Debt, Principal Balance

$ 100,000,000

100,000,000

Stated Maturity Date

Jan. 9, 2022

Number of extensions available | Extension_Option

3

Extension term (in months)

1 year

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

Debt Instrument [Line Items]

Long-term Debt, Principal Balance

$ 0

150,000,000

Stated Interest Rate

4.04%

Stated Maturity Date

Oct. 31, 2021

Repayments of Unsecured Debt

150,000,000

Loss on early extinguishment of debt

3,900,000

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

Debt Instrument [Line Items]

Long-term Debt, Principal Balance

$ 100,000,000

100,000,000

Stated Maturity Date

Mar. 1, 2023

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

Debt Instrument [Line Items]

Long-term Debt, Principal Balance

$ 50,000,000

50,000,000

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, Principal Balance

$ 100,000,000

100,000,000

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, Principal Balance

$ 100,000,000

100,000,000

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, Principal Balance

$ 100,000,000

100,000,000

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, Principal Balance

$ 250,000,000

250,000,000

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, Principal Balance

$ 100,000,000

100,000,000

Stated Interest Rate

4.24%

4.24%

Stated Maturity Date

May 23, 2029

Unsecured debt | Senior Guaranteed Notes, Series G [Member] | American Assets Trust, L.P.

Debt Instrument [Line Items]

Long-term Debt, Principal Balance

150,000,000

$ 150,000,000

Stated Interest Rate

3.91%

3.91%

Unsecured debt | 3.375% Senior Unsecured Notes | American Assets Trust, L.P.

Debt Instrument [Line Items]

Long-term Debt, Principal Balance

$ 500,000,000

$ 0

Stated Interest Rate

3.38%

Stated Maturity Date

Feb. 1, 2031

Unsecured line of credit

Debt Instrument [Line Items]

Minimum fixed charge coverage ratio covenant threshold

1.5

1.5

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

Debt Instrument [Line Items]

Repayment of unsecured line of credit

$ 100,000,000

Debt Scheduled Principal Paymen

Debt Scheduled Principal Payments on Notes Payable (Details) $ in Thousands	Dec. 31, 2021USD ($)
Debt Disclosure [Abstract]
2022	$ 211,000
2023	150,000
2024	100,000
2025	200,000
2026	0
Thereafter	1,000,000
Notes payable, total	$ 1,661,000

Debt (Details)

Debt (Details)

Jan. 14, 2022USD ($)

Jan. 05, 2022USD ($)Extension_Option

Jan. 26, 2021USD ($)

Aug. 11, 2020USD ($)

Jun. 20, 2019USD ($)

Jan. 09, 2019Extension_Option

Jan. 09, 2018USD ($)Extension_Option

May 31, 2017USD ($)

Apr. 25, 2017USD ($)

Mar. 31, 2017

May 02, 2016USD ($)

Apr. 07, 2016USD ($)

Mar. 29, 2016USD ($)

Mar. 23, 2016USD ($)

Mar. 01, 2016USD ($)

Jan. 29, 2016USD ($)

Oct. 31, 2014USD ($)

Jan. 09, 2014USD ($)Extension_Option

Dec. 31, 2021USD ($)

Dec. 31, 2020USD ($)

Dec. 31, 2019USD ($)

Jul. 30, 2019USD ($)

Dec. 31, 2018

Jul. 19, 2017USD ($)

May 23, 2017USD ($)

Mar. 01, 2017USD ($)

Debt Instrument [Line Items]

Line of Credit Facility, Interest Rate During Period

1.14%

Unsecured line of credit, net

$ 0

$ 99,151,000

Unsecured notes payable, net

1,538,238,000

1,196,677,000

Repayments of Unsecured Debt

155,375,000

0

$ 0

Loss on early extinguishment of debt

(4,271,000)

0

0

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%

Term Loan A | Unsecured debt | Federal Funds Rate

Debt Instrument [Line Items]

Basis spread on federal funds rate

0.50%

Term Loan A | Unsecured debt | Federal Funds Rate | Subsequent Event [Member]

Debt Instrument [Line Items]

Basis spread on federal funds rate

0.50%

Term Loan A | Unsecured debt | Eurodollar

Debt Instrument [Line Items]

Basis spread on Eurodollar rate

1.00%

Term Loan A | Unsecured debt | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Subsequent Event [Member]

Debt Instrument [Line Items]

Basis spread on Eurodollar rate

1.00%

Term Loan A | Unsecured debt | Minimum | Base Rate | Subsequent Event [Member]

Debt Instrument [Line Items]

Debt Instrument, Spread on Variable Rate Basis, Four

0.20%

Term Loan A | Unsecured debt | Maximum | Base Rate | Subsequent Event [Member]

Debt Instrument [Line Items]

Debt Instrument, Spread on Variable Rate Basis, Four

0.70%

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

1.00%

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

1.00%

Second Amended and Restated Credit Facility | Unsecured line of credit

Debt Instrument [Line Items]

Percentage annual distributions cannot exceed funds from operations

95.00%

Second Amended and Restated Credit Facility | Unsecured line of credit | LIBOR

Debt Instrument [Line Items]

Basis spread on variable rate (in percents)

1.00%

Unsecured line of credit | Unsecured debt | Federal Funds Rate | Subsequent Event [Member]

Debt Instrument [Line Items]

Basis spread on federal funds rate

0.50%

Unsecured line of credit | Unsecured debt | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Subsequent Event [Member]

Debt Instrument [Line Items]

Basis spread on Eurodollar rate

1.00%

Unsecured line of credit | Unsecured debt | Minimum | Base Rate | Subsequent Event [Member]

Debt Instrument [Line Items]

Debt Instrument, Spread on Variable Rate Basis, Four

0.10%

Unsecured line of credit | Unsecured debt | Maximum | Base Rate | Subsequent Event [Member]

Debt Instrument [Line Items]

Debt Instrument, Spread on Variable Rate Basis, Four

0.50%

American Assets Trust, L.P.

Debt Instrument [Line Items]

Unsecured line of credit, net

0

99,151,000

Unsecured notes payable, net

1,538,238,000

1,196,677,000

Repayments of Unsecured Debt

155,375,000

0

0

Loss on early extinguishment of debt

(4,271,000)

0

$ 0

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 | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Subsequent Event [Member]

Debt Instrument [Line Items]

Variable rate basis

SOFR

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 line of credit | Minimum | Revolving Credit Facility | LIBOR | Subsequent Event [Member]

Debt Instrument [Line Items]

Basis spread on variable rate (in percents)

1.05%

American Assets Trust, L.P. | 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. | Unsecured line of credit | Maximum | Revolving Credit Facility | LIBOR | Subsequent Event [Member]

Debt Instrument [Line Items]

Basis spread on variable rate (in percents)

1.50%

American Assets Trust, L.P. | 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. | Unsecured debt

Debt Instrument [Line Items]

Long-term Debt, Principal Balance

1,550,000,000

1,200,000,000

Unsecured notes payable, net

$ 1,538,238,000

1,196,677,000

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

Debt Instrument [Line Items]

Unsecured notes payable, net

$ 100,000,000

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

Debt Instrument [Line Items]

Basis spread on variable rate (in percents)

0.20%

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

Debt Instrument [Line Items]

Basis spread on variable rate (in percents)

0.20%

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

Debt Instrument [Line Items]

Basis spread on variable rate (in percents)

0.70%

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

Debt Instrument [Line Items]

Basis spread on variable rate (in percents)

0.70%

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

Debt Instrument [Line Items]

Stated Maturity Date

Jan. 9, 2022

Long-term Debt, Principal Balance

$ 100,000,000

100,000,000

Number of extensions available | Extension_Option

3

Extension term (in months)

1 year

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

Debt Instrument [Line Items]

Number of extensions available | Extension_Option

2

Extension term (in months)

6 months

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

Debt Instrument [Line Items]

Variable rate basis

LIBOR

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

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

Debt Instrument [Line Items]

Debt Instrument, Variable Rate Basis, Five

0.00%

Minimum base rate

1.00%

Prime rate

prime rate

Federal funds rate

federal funds rate

American Assets Trust, L.P. | Term Loan A | Unsecured debt | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Subsequent Event [Member]

Debt Instrument [Line Items]

Variable rate basis

SOFR

Eurodollar

SOFR

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%

American Assets Trust, L.P. | Term Loan A | Unsecured debt | Minimum | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Subsequent Event [Member]

Debt Instrument [Line Items]

Basis spread on variable rate (in percents)

1.20%

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%

American Assets Trust, L.P. | Term Loan A | Unsecured debt | Maximum | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Subsequent Event [Member]

Debt Instrument [Line Items]

Basis spread on variable rate (in percents)

1.70%

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

Debt Instrument [Line Items]

Number of year amortization schedule

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

Long-term Debt, Principal Balance

$ 100,000,000

100,000,000

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

Long-term Debt, Principal Balance

$ 50,000,000

50,000,000

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%

Long-term Debt, Principal Balance

$ 250,000,000

250,000,000

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%

4.24%

Long-term Debt, Principal Balance

$ 100,000,000

100,000,000

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%

Long-term Debt, Principal Balance

$ 100,000,000

100,000,000

American Assets Trust, L.P. | Senior Guaranteed Notes, Series G [Member] | Unsecured debt

Debt Instrument [Line Items]

Stated Interest Rate

3.91%

3.91%

Long-term Debt, Principal Balance

150,000,000

$ 150,000,000

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

$ 250,000,000

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

Debt Instrument [Line Items]

Unsecured line of credit, net

$ 0

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%

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

Debt Instrument [Line Items]

Stated Maturity Date

Oct. 31, 2021

Stated Interest Rate

4.04%

Long-term Debt, Principal Balance

$ 0

150,000,000

Repayments of Unsecured Debt

$ 150,000,000

Loss on early extinguishment of debt

$ 3,900,000

American Assets Trust, L.P. | 3.375% Senior Unsecured Notes

Debt Instrument [Line Items]

Stated Interest Rate

3.375%

American Assets Trust, L.P. | 3.375% Senior Unsecured Notes | Unsecured debt

Debt Instrument [Line Items]

Face amount of debt

$ 500,000,000

Stated Maturity Date

Feb. 1, 2031

Stated Interest Rate

3.38%

Long-term Debt, Principal Balance

$ 500,000,000

$ 0

American Assets Trust, L.P. | Unsecured debt

Debt Instrument [Line Items]

Number of year amortization schedule

10 years

American Assets Trust, L.P. | Unsecured line of credit | Unsecured debt | Base Rate | Subsequent Event [Member]

Debt Instrument [Line Items]

Debt Instrument, Variable Rate Basis, Five

0.00%

Minimum base rate

1.00%

Prime rate

prime rate

Federal funds rate

federal funds rate

American Assets Trust, L.P. | Unsecured line of credit | Unsecured debt | Minimum | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Subsequent Event [Member]

Debt Instrument [Line Items]

Basis spread on variable rate (in percents)

1.05%

American Assets Trust, L.P. | Unsecured line of credit | Unsecured debt | Maximum | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Subsequent Event [Member]

Debt Instrument [Line Items]

Basis spread on variable rate (in percents)

1.50%

American Assets Trust, L.P. | Third Amended and Restated Credit Facility | Subsequent Event [Member]

Debt Instrument [Line Items]

Revolving credit facility borrowing limit, maximum borrowing capacity

$ 500,000,000

American Assets Trust, L.P. | Third Amended and Restated Credit Facility | Unsecured line of credit | Revolving Credit Facility | Subsequent Event [Member]

Debt Instrument [Line Items]

Revolving credit facility borrowing limit, maximum borrowing capacity

400,000,000

American Assets Trust, L.P. | Third Amended and Restated Credit Facility | Unsecured debt | Subsequent Event [Member]

Debt Instrument [Line Items]

Revolving credit facility borrowing limit, maximum borrowing capacity

$ 100,000,000

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

Debt Instrument [Line Items]

Fixed interest rate on derivative

1.748%

1.88%

Notional amount

$ 100,000,000

$ 150,000,000

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

Debt Instrument [Line Items]

Fixed interest rate on derivative

1.441%

1.4485%

4.13%

Notional amount

$ 50,000,000

$ 100,000,000

$ 100,000,000

Maturity date

Mar. 31, 2027

Mar. 31, 2027

Mar. 1, 2023

Mar. 1, 2023

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 A | Subsequent Event [Member]

Debt Instrument [Line Items]

Fixed interest rate on derivative

2.80%

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

Debt Instrument [Line Items]

Fixed interest rate on derivative

3.15%

2.65%

3.15%

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

Debt Instrument [Line Items]

Fixed interest rate on derivative

3.14%

2.64%

3.14%

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

Debt Instrument [Line Items]

Fixed interest rate on derivative

2.064%

2.313%

Notional amount

$ 100,000,000

$ 100,000,000

Maturity date

Jul. 26, 2017

Treasury Lock | American Assets Trust, L.P. | Wells Fargo Bank, N.A. | Not Designated as Hedging Instrument [Member]

Debt Instrument [Line Items]

Fixed interest rate on derivative

0.7115%

Notional amount

$ 200,000,000

Maturity date

Nov. 12, 2020

Treasury Lock | American Assets Trust, L.P. | Wells Fargo Bank, N.A. | Designated as Hedging Instrument | Cash Flow Hedging

Debt Instrument [Line Items]

Fixed interest rate on derivative

1.9925%

Notional amount

$ 100,000,000

Maturity date

Jul. 31, 2019

Treasury Lock | American Assets Trust, L.P. | Subsequent Event [Member] | Wells Fargo Bank, N.A. | Not Designated as Hedging Instrument [Member]

Debt Instrument [Line Items]

Notional amount

$ 50,000,000

Treasury Lock | American Assets Trust, L.P. | Subsequent Event [Member] | Wells Fargo Bank, N.A. | Designated as Hedging Instrument | Cash Flow Hedging

Debt Instrument [Line Items]

Fixed interest rate on derivative

2.80%

Maturity date

Jan. 5, 2027

Derivative and Hedging (Details

Derivative and Hedging (Details) - USD ($)

Jan. 14, 2022

Oct. 01, 2020

Aug. 11, 2020

Jul. 17, 2019

Jun. 20, 2019

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

Sep. 19, 2014

Dec. 31, 2021

Dec. 31, 2020

Dec. 31, 2018

May 23, 2017

Derivative Instruments and Hedging Activities Disclosures [Line Items]

Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months

$ 1,100,000

Derivative liabilities at fair value

$ (1,807,000)

$ (4,531,000)

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]

Term of derivative contract

7 years

10 years

10 years

10 years

7 years

American Assets Trust, L.P. | Forward Contracts

Derivative Instruments and Hedging Activities Disclosures [Line Items]

Term of derivative contract

1 month

Gain on derivatives

$ 0

$ 500,000

$ 700,000

$ 10,400,000

$ 1,600,000

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%

4.13%

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

Gain/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

Gain/Loss recognized in other comprehensive income (loss)

$ 500,000

$ 700,000

Gain on derivatives

$ 500,000

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

Derivative liabilities at fair value

$ (1,206,000)

Wells Fargo Bank, N.A. | American Assets Trust, L.P. | Not Designated as Hedging Instrument [Member] | Treasury Lock

Derivative Instruments and Hedging Activities Disclosures [Line Items]

Notional amount

$ 200,000,000

Fixed interest rate on derivative

0.7115%

Term of derivative contract

10 years

Maturity date

Nov. 12, 2020

Wells Fargo Bank, N.A. | American Assets Trust, L.P. | Not Designated as Hedging Instrument [Member] | Treasury Lock | Subsequent Event [Member]

Derivative Instruments and Hedging Activities Disclosures [Line Items]

Notional amount

$ 50,000,000

Term of derivative contract

5 years

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 | Treasury Lock

Derivative Instruments and Hedging Activities Disclosures [Line Items]

Notional amount

$ 100,000,000

Fixed interest rate on derivative

1.9925%

Term of derivative contract

10 years

Maturity date

Jul. 31, 2019

Amortization Period of Deferred Gain (Loss) on Discontinuation of Fair Value Hedge

10 years

Wells Fargo Bank, N.A. | American Assets Trust, L.P. | Cash Flow Hedging | Designated as Hedging Instrument | Treasury Lock | Subsequent Event [Member]

Derivative Instruments and Hedging Activities Disclosures [Line Items]

Fixed interest rate on derivative

2.80%

Maturity date

Jan. 5, 2027

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

Derivative liabilities at fair value

$ (601,000)

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

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%

2.65%

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%

2.64%

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%

Term Loan A | American Assets Trust, L.P. | Interest Rate Swap | Subsequent Event [Member]

Derivative Instruments and Hedging Activities Disclosures [Line Items]

Fixed interest rate on derivative

2.80%

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, 2022

Partners Capital of American _2

Partners Capital of American Assets Trust, L.P. (Details) - shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Common Stock
Capital Unit [Line Items]
Conversion of operating partnership units (in shares)		209,011	787,060
American Assets Trust, L.P.
Capital Unit [Line Items]
Ownership percent by parent	78.80%
American Assets Trust, L.P.
Capital Unit [Line Items]
Noncontrolling common units (in shares)	16,181,537
American Assets Trust, L.P. | Common Stock
Capital Unit [Line Items]
Conversion of operating partnership units (in shares)	0	209,011	787,060
Non-Affiliated Investors | American Assets Trust, L.P.
Capital Unit [Line Items]
Percentage of ownership interests classified as noncontrolling	21.20%

Equity of American Assets Tru_3

Equity of American Assets Trust, Inc. (Details)	Dec. 03, 2021USD ($)Agent	Jun. 14, 2019USD ($)shares	Dec. 31, 2021USD ($)$ / sharesshares	Dec. 31, 2020USD ($)shares	Dec. 31, 2019USD ($)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
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)			2,402,848
Noncash compensation expense | $			$ 8,500,000	$ 6,300,000	$ 4,500,000
Unrecognized compensation expense | $			8,200,000
Proceeds from issuance of common stock, net | $		$ 472,600,000	$ 0	$ 0	$ 515,354,000
Common stock, shares issued		10,925,000	60,525,580	60,476,292
Option Indexed to Issuer's Equity, Indexed Shares		1,425,000
American Assets Trust, L.P.
Equity [Line Items]
Antidilutive securities excluded from computation of EPS (in shares)			485,202	357,048	330,197
Restricted Stock
Equity [Line Items]
Unrecognized compensation expense, weighted-average recognition period (in years)			1 year 7 months 6 days
At The Market Equity Program
Equity [Line Items]
Aggregate offering price of common share | $	$ 250,000,000
Common shares issued (in shares)			0
Remaining capacity available for issuance | $			$ 250,000,000
$250.0 Million ATM | At The Market Equity Program
Equity [Line Items]
Number of sales agents | Agent	5
Operating Partnership Units | American Assets Trust, L.P.
Equity [Line Items]
Weighted average unvested shares outstanding (in shares)			485,202	357,048	330,197

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, 2021

Sep. 30, 2021

Jun. 30, 2021

Mar. 31, 2021

Dec. 31, 2020

Sep. 30, 2020

Jun. 30, 2020

Mar. 31, 2020

Dec. 31, 2019

Sep. 30, 2019

Jun. 30, 2019

Mar. 31, 2019

Dec. 31, 2021

Dec. 31, 2020

Dec. 31, 2019

Equity [Abstract]

Dividends period

Fourth Quarter 2021

Third Quarter 2021

Second Quarter 2021

First Quarter 2021

Fourth Quarter 2020

Third Quarter 2020

Second Quarter 2020

First Quarter 2020

Fourth Quarter 2019

Third Quarter 2019

Second Quarter 2019

First Quarter 2019

Amount per Share/Unit (in USD per unit)

$ 0.30

$ 0.30

$ 0.28

$ 0.28

$ 0.25

$ 0.25

$ 0.20

$ 0.30

$ 0.30

$ 0.28

$ 0.28

$ 0.28

$ 1.16

$ 1

$ 1.14

Date dividend to be paid

Dec. 23, 2021

Sep. 23, 2021

Jun. 24, 2021

Mar. 25, 2021

Dec. 24, 2020

Sep. 24, 2020

Jun. 25, 2020

Mar. 26, 2020

Dec. 26, 2019

Sep. 26, 2019

Jun. 27, 2019

Mar. 28, 2019

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, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Equity [Abstract]
Ordinary income (in USD per share)													$ 0.73	$ 0.66	$ 1.09
Capital gain (in USD per share)													0	0	0
Return of capital (in USD per share)													0.43	0.34	0.05
Total (in USD per share)	$ 0.30	$ 0.30	$ 0.28	$ 0.28	$ 0.25	$ 0.25	$ 0.20	$ 0.30	$ 0.30	$ 0.28	$ 0.28	$ 0.28	$ 1.16	$ 1	$ 1.14
Ordinary income													62.60%	66.00%	95.60%
Capital gain													0.00%	0.00%	0.00%
Return of capital													37.40%	34.00%	4.40%
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. 09, 2021	Jun. 08, 2021	Dec. 04, 2020	Jun. 09, 2020	Dec. 09, 2019	Jun. 11, 2019	Dec. 06, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage			33.30%		33.30%		33.30%
Granted, Weighted Average Grant Date Fair Value (in USD per share)		$ 38.59		$ 33.29		$ 45.35
Granted, Shares	224,635	5,184	311,566	6,008	168,596	4,412
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, Weighted Average Grant Date Fair Value (in USD per share)	$ 24.27		$ 19.02		$ 28.06
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, Weighted Average Grant Date Fair Value (in USD per share)	$ 25.17		$ 20.83		$ 30.97

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, 2021$ / sharesshares
Nonvested, Number of Shares
Nonvested, Beginning, Shares | shares	491,957
Granted, Shares | shares	229,819
Vested, Shares | shares	(78,989)
Forfeited, Shares | shares	(155,390)
Nonvested, Ending, Shares | shares	487,397
Nonvested, Weighted Average Grant Date Fair Value
Nonvested, Beginning, Weighted Average Grant Date Fair Value (in USD per Share) | $ / shares	$ 23.53
Granted, Weighted Average Grant Date Fair Value (in USD per share) | $ / shares	25.04
Vested, Weighted Average Grant Date Fair Value (in USD per share) | $ / shares	25
Forfeited, Weighted Average Grant Date Fair Value (in USD per share) | $ / shares	24.25
Nonvested, End of Year, Weighted Average Grant Date Fair Value (in USD per Share) | $ / shares	$ 23.78

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, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
NUMERATOR
Net income from operations									$ 36,593	$ 35,588	$ 60,188
Less: Net income attributable to restricted shares	$ (147)	$ (145)	$ (135)	$ (137)	$ (123)	$ (87)	$ (69)	$ (104)	(564)	(383)	(381)
Less: Income attributable to unitholders in the Operating Partnership									7,653	7,545	14,089
NET INCOME ATTRIBUTABLE TO AMERICAN ASSETS TRUST, INC. STOCKHOLDERS									28,376	27,660	45,718
Income attributable to American Assets Trust, Inc. common stockholders—basic									28,376	27,660	45,718
Plus: Income attributable to unitholders in the Operating Partnership									(7,653)	(7,545)	(14,089)
Net income attributable to common stockholders-diluted									$ 36,029	$ 35,205	$ 59,807
DENOMINATOR
Weighted average shares of common stock outstanding-basic (in shares)									59,990,740	59,806,309	54,110,949
Effect of dilutive securities-conversion of Operating Partnership units (in shares)									16,181,537	16,313,454	16,675,183
Weighted average common shares outstanding - diluted (in shares)									76,172,277	76,119,763	70,786,132
Earnings (loss) per common share-basic
Basic net income attributable to common stockholders per share (in dollars per share)									$ 0.47	$ 0.46	$ 0.84
Earnings (loss) per common share-diluted
Diluted net income attributable to common stockholders per share (in dollars per share)									$ 0.47	$ 0.46	$ 0.84

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Deferred tax liabilities	$ 967	$ 570	$ 600

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, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
Federal	$ 0	$ (542)	$ 48
State	483	412	625
Federal	118	(80)	237
State	137	201	(91)
Provision for income taxes	$ 738	$ (9)	$ 819

Commitments and Contingencies -

Commitments and Contingencies - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021USD ($)PropertymoCustomer	Dec. 31, 2020
Commitment And Contingencies [Line Items]
Termination payment, as high as | $	$ 4
Transfer taxes accrued in connection with the Offering | $	$ 6.6
Maximum percentage of total revenue provided by any single tenant	10.00%	10.00%
Rental Income
Commitment And Contingencies [Line Items]
Number of tenants that comprise 17.6% of total annualized based rent | Customer	4
Total Revenues | Total Revenues, Property | Alamo Quarry Market and Waikele Center
Commitment And Contingencies [Line Items]
Percentage of total revenue provided by properties	9.10%	9.10%
Base Rent | Customer Concentration Risk | Google LLC at The Landmark at One Market
Commitment And Contingencies [Line Items]
Percentage of total revenue provided by properties	9.60%
Base Rent | Rental Income | LPL Holdings, Inc., Autodesk, Inc., Smartsheet, Inc., and VMware, Inc
Commitment And Contingencies [Line Items]
Percentage of total revenue provided by properties	16.80%
Revenue Benchmark | Product Concentration Risk | Office Building
Commitment And Contingencies [Line Items]
Percentage of total revenue provided by properties	49.60%	51.50%
Revenue Benchmark | Product Concentration Risk | Retail Site
Commitment And Contingencies [Line Items]
Percentage of total revenue provided by properties	25.20%	25.60%
Southern California
Commitment And Contingencies [Line Items]
Number of consolidated properties located in Southern California | Property	15
Southern California | Total Revenue | Total Revenues, Property
Commitment And Contingencies [Line Items]
Percentage of total revenue provided by properties	43.00%
Hawaii | Total Revenue | Total Revenues, Property
Commitment And Contingencies [Line Items]
Percentage of total revenue provided by properties	11.30%
Maximum | Base Rent | Customer Concentration Risk
Commitment And Contingencies [Line Items]
Percentage of total revenue provided by properties	2.00%
Maximum | Ground Water Contamination | Del Monte Center
Commitment And Contingencies [Line Items]
Environmental remediation monitoring period	7 years
Minimum | Ground Water Contamination | Del Monte Center
Commitment And Contingencies [Line Items]
Environmental remediation monitoring period	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%

LEASES - Narrative (Details)

LEASES - Narrative (Details)	12 Months Ended
	Dec. 31, 2021leasestate
Lessor, Lease, Description [Line Items]
Operating leases rental period terms	12 months
Number of States | state	5
Minimum
Lessor, Lease, Description [Line Items]
Term of office and retail leases	3 years
Term of apartment leases	7 months
Lease extension option period	3 years
Lease extension options exercise period	6 months
Maximum
Lessor, Lease, Description [Line Items]
Term of office and retail leases	10 years
Term of apartment leases	15 months
Lease extension option period	10 years
Lease extension options exercise period	12 months
The Land Mark at One Market
Lessor, Lease, Description [Line Items]
Lease extension option exercise period	5 years
Retail Or Office
Lessor, Lease, Description [Line Items]
Number of leases	874
Residential Property
Lessor, Lease, Description [Line Items]
Number of leases	1,910

LEASES - Minimum Future Rentals

LEASES - Minimum Future Rentals from Noncancelable Operating Leases (Details) $ in Thousands	Dec. 31, 2021USD ($)
Leases [Abstract]
2022	$ 235,625
2023	221,814
2024	190,860
2025	167,588
2026	152,488
Thereafter	370,926
Total	$ 1,339,301

LEASES - Lease Obligations - Mi

LEASES - Lease Obligations - Minimum Future Rental Payments from Operating Leases (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Leases [Abstract]
2022	$ 3,232
2023	3,328
2024	3,428
2025	3,531
2026	3,584
Thereafter	16,126
Total lease payments	33,229
Imputed interest	(5,312)
Present value of lease liability	$ 27,917	$ 30,060
The Land Mark at One Market
Lessor, Lease, Description [Line Items]
Lease extension option exercise period	5 years

LEASES - Lease Costs & Addition

LEASES - Lease Costs & Additional Lease Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Leases [Abstract]
Operating lease cost	$ 3,926	$ 3,902
Sublease income	(3,634)	(4,297)
Lease Income		$ (395)
Lease cost	$ 292
Weighted-average remaining lease term - operating leases (in years)	9 years 6 months
Weighted-average discount rate - operating leases (as a percent)	3.19%

LEASES - Supplemental Lease Inf

LEASES - Supplemental Lease Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Operating cash flow information:
Cash paid for amounts included in the measurement of lease liabilities	$ 2,791	$ 3,422
Non-cash activity:
Right-of-use assets obtained in exchange for operating lease obligations	$ 0	$ 27,321

Component of Rental Income an_3

Component of Rental Income and Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating Leases, Income Statement, Lease Revenue [Abstract]
Recognition of straight-line rents	$ 14	$ 18.9	$ 3.2
Recognition of amortization of above and below market leases	$ 3.2	$ 3.9	$ 3.8

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, 2021	Dec. 31, 2020	Dec. 31, 2019
Rental Income [Line Items]
Operating Lease, Variable Lease Income	$ 4,337	$ 3,516	$ 2,476
Hotel revenue	24,935	17,209	40,297
Other	2,351	2,185	2,223
Total rental income	360,208	330,312	343,865
Total Retail
Rental Income [Line Items]
Lease rental income	89,326	82,176	99,601
Total Office
Rental Income [Line Items]
Lease rental income	180,704	170,853	136,118
Total Multifamily
Rental Income [Line Items]
Lease rental income	48,654	47,071	47,448
Total Mixed-Use
Rental Income [Line Items]
Lease rental income	$ 9,901	$ 7,302	$ 15,702

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, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating Leases, Income Statement, Lease Revenue [Abstract]
Direct Costs of Leased Property, Lessor, Expense	$ 41,488	$ 38,194	$ 38,331
Hotel operating	17,518	13,691	24,522
Repairs and maintenance	18,113	17,813	17,035
Marketing	1,779	2,023	2,538
Rent	4,023	3,955	3,372
Hawaii excise tax	2,792	2,479	4,160
Management fees	1,267	1,023	2,009
Rental expenses	$ 86,980	$ 79,178	$ 91,967

Other Income (Expenses) (Detail

Other Income (Expenses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Other Income and Expenses [Abstract]
Interest and investment income	$ 324	$ 436	$ 696
Income tax expense	(738)	9	(819)
Other Nonoperating Expense	(4)
Other non-operating income		2	1
Total other income (expense)	$ (418)	$ 447	$ (122)

Related Party Transactions (Det

Related Party Transactions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Jun. 01, 2021	Mar. 01, 2021	Mar. 01, 2019
Related Party Transaction [Line Items]
Investment in WBW CHP LLC, in percentage		47.70%
Rental income		$ 360,208	$ 330,312	$ 343,865
WBW CHP LLC
Related Party Transaction [Line Items]
Recovered reimbursements of operating expenses of WBW CHP LLC		1,000	1,000	$ 1,100
Common Stock
Related Party Transaction [Line Items]
Common shares issued (in shares)				11,871,552
American Assets, Inc. | Board of Directors Chairman
Related Party Transaction [Line Items]
Lessor, Operating Lease, Term of Contract						10 years	3 years
Rental income		300	200	$ 200
American Assets, Inc. | Board of Directors Chairman | Forecast
Related Party Transaction [Line Items]
Rental income	$ 200
EDisability, LLC | Board of Directors Chairman
Related Party Transaction [Line Items]
Lessor, Operating Lease, Term of Contract					3 years
Rental income		100	200	200
EDisability, LLC | Board of Directors Chairman | Forecast
Related Party Transaction [Line Items]
Rental income	$ 100
AAI Aviation, Inc. | Board of Directors Chairman
Related Party Transaction [Line Items]
Aviation expense		$ 200	$ 0	$ 200
Insurance Company of the West, Inc. | Board of Directors Chairman
Related Party Transaction [Line Items]
Percentage of ownership interests classified as noncontrolling		33.90%
Insurance Company of the West, Inc. | Common Stock | Board of Directors Chairman
Related Party Transaction [Line Items]
Percentage of ownership interests classified as noncontrolling		14.40%
Insurance Company of the West, Inc. | Member Units | Board of Directors Chairman
Related Party Transaction [Line Items]
Percentage of ownership interests classified as noncontrolling		19.50%

Segment Reporting (Details)

Segment Reporting (Details)	12 Months Ended
	Dec. 31, 2021SegmentRoom
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								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Operating income (loss)	$ 25,715	$ 27,669	$ 26,423	$ 20,062	$ 16,415	$ 20,323	$ 22,995	$ 28,848	$ 99,869	$ 88,581	$ 113,685
Total segments' profit									246,054	223,454	234,761
Total Retail
Segment Reporting Information [Line Items]
Property revenue									94,662	88,280	107,604
Property expense									(27,983)	(27,374)	(30,633)
Operating income (loss)									66,679	60,906	76,971
Total Office
Segment Reporting Information [Line Items]
Property revenue									186,366	177,554	144,683
Property expense									(50,233)	(47,424)	(42,234)
Operating income (loss)									136,133	130,130	102,449
Total Multifamily
Segment Reporting Information [Line Items]
Property revenue									52,315	50,327	51,066
Property expense									(23,211)	(22,074)	(20,863)
Operating income (loss)									29,104	28,253	30,203
Total Mixed-Use
Segment Reporting Information [Line Items]
Property revenue									42,485	28,412	63,388
Property expense									(28,347)	(24,247)	(38,250)
Operating income (loss)									$ 14,138	$ 4,165	$ 25,138

Segment Reporting Reconciliatio

Segment Reporting Reconciliation of Segment Profit to Net Income Attributable to Stockholders (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting [Abstract]
Total segments' profit									$ 246,054	$ 223,454	$ 234,761
General and administrative									(29,879)	(26,581)	(24,871)
Depreciation and amortization									(116,306)	(108,292)	(96,205)
Interest expense									58,587	53,440	54,008
Loss on early extinguishment of debt									(4,271)	0	0
Gain on sale of real estate									0	0	633
Other (expense) income, net									(418)	447	(122)
Net income	$ 10,478	$ 12,895	$ 11,487	$ 1,733	$ 3,788	$ 6,490	$ 9,826	$ 15,484	36,593	35,588	60,188
Net income attributable to restricted shares	(147)	(145)	(135)	(137)	(123)	(87)	(69)	(104)	(564)	(383)	(381)
Net income attributable to unitholders in the Operating Partnership	$ (2,194)	$ (2,709)	$ (2,411)	$ (339)	$ (767)	$ (1,365)	$ (2,101)	$ (3,312)	(7,653)	(7,545)	(14,089)
Income attributable to American Assets Trust, Inc. common stockholders—basic									$ 28,376	$ 27,660	$ 45,718

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, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Net real estate	$ 2,681,981	$ 2,492,734
Secured Notes Payable	111,000	111,000
Capital Expenditures and Leasing Commissions	107,730	69,077
Total Retail
Segment Reporting Information [Line Items]
Net real estate	591,107	607,918
Secured Notes Payable	0	0
Capital Expenditures and Leasing Commissions	7,232	8,596
Total Office
Segment Reporting Information [Line Items]
Net real estate	1,536,212	1,317,107
Secured Notes Payable	111,000	111,000
Capital Expenditures and Leasing Commissions	93,116	52,882
Total Multifamily
Segment Reporting Information [Line Items]
Net real estate	381,315	389,804
Capital Expenditures and Leasing Commissions	5,841	3,897
Total Mixed-Use
Segment Reporting Information [Line Items]
Net real estate	173,347	177,905
Capital Expenditures and Leasing Commissions	1,541	3,702
American Assets Trust, L.P.
Segment Reporting Information [Line Items]
Net real estate	2,681,981	2,492,734
Secured notes payable | American Assets Trust, L.P.
Segment Reporting Information [Line Items]
Debt issuance costs, net of accumulated amortization of $2,070 and $0, respectively	$ 35	$ 77

Quarterly Financial Informati_3

Quarterly Financial Information (Unaudited) Selected Quarterly Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Quarterly Financial Information [Line Items]
Total revenue	$ 101,747	$ 98,286	$ 91,809	$ 83,986	$ 81,347	$ 84,374	$ 82,109	$ 96,743	$ 375,828	$ 344,573	$ 366,741
Operating income (loss)	25,715	27,669	26,423	20,062	16,415	20,323	22,995	28,848	99,869	88,581	113,685
Net income	10,478	12,895	11,487	1,733	3,788	6,490	9,826	15,484	36,593	35,588	60,188
Net income attributable to restricted shares	(147)	(145)	(135)	(137)	(123)	(87)	(69)	(104)	(564)	(383)	(381)
Net income attributable to unitholders in the Operating Partnership	(2,194)	(2,709)	(2,411)	(339)	(767)	(1,365)	(2,101)	(3,312)	(7,653)	(7,545)	(14,089)
Net income attributable to American Assets Trust, Inc. stockholders	$ 8,137	$ 10,041	$ 8,941	$ 1,257	$ 2,898	$ 5,038	$ 7,656	$ 12,068
Net income attributable to common stockholders - basic and diluted (in dollars per share)	$ 0.14	$ 0.17	$ 0.15	$ 0.02	$ 0.05	$ 0.08	$ 0.13	$ 0.20
American Assets Trust, L.P.
Quarterly Financial Information [Line Items]
Total revenue	$ 101,747	$ 98,286	$ 91,809	$ 83,986	$ 81,347	$ 84,374	$ 82,109	$ 96,743	375,828	344,573	366,741
Operating income (loss)	25,715	27,669	26,423	20,062	16,415	20,323	22,995	28,848	99,869	88,581	113,685
Net income	10,478	12,895	11,487	1,733	3,788	6,490	9,826	15,484	36,593	35,588	60,188
Net income attributable to restricted shares	(147)	(145)	(135)	(137)	(123)	(87)	(69)	(104)	$ (564)	$ (383)	$ (381)
Net income attributable to American Assets Trust, L.P. unit holders	$ 10,331	$ 12,750	$ 11,352	$ 1,596	$ 3,665	$ 6,403	$ 9,757	$ 15,380
Net income attributable to common stockholders - basic and diluted (in dollars per share)	$ 0.14	$ 0.17	$ 0.15	$ 0.02	$ 0.05	$ 0.08	$ 0.13	$ 0.20

Subsequent Events (Details)

Subsequent Events (Details) - American Assets Trust, L.P.	Jan. 05, 2022USD ($)Extension_Option	Jan. 09, 2019Extension_Option	Jan. 09, 2014Extension_Option	Jan. 14, 2022	Dec. 31, 2021
Unsecured line of credit | Revolving Credit Facility
Subsequent Event [Line Items]
Number of extensions available | Extension_Option			2
Extension term (in months)			6 months
Term Loan A | Interest Rate Swap
Subsequent Event [Line Items]
Fixed interest rate on derivative					4.13%
Term Loan A | Unsecured debt
Subsequent Event [Line Items]
Number of extensions available | Extension_Option		3
Extension term (in months)		1 year
Subsequent Event [Member] | Third Amended and Restated Credit Facility
Subsequent Event [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity | $	$ 500,000,000
Subsequent Event [Member] | Third Amended and Restated Credit Facility | Unsecured debt
Subsequent Event [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity | $	100,000,000
Subsequent Event [Member] | Third Amended and Restated Credit Facility | Unsecured line of credit | Revolving Credit Facility
Subsequent Event [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity | $	$ 400,000,000
Subsequent Event [Member] | Term Loan A | Interest Rate Swap
Subsequent Event [Line Items]
Fixed interest rate on derivative				2.80%
Subsequent Event [Member] | Term Loan A | Unsecured debt
Subsequent Event [Line Items]
Number of extensions available | Extension_Option	2
Extension term (in months)	6 months

SCHEDULE III-Consolidated Rea_2

SCHEDULE III-Consolidated Real Estate and Accumulated Depreciation (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2021	$ 111,000
Initial Cost, Land	652,608
Initial Cost, Building and Improvements	1,923,674
Cost Capitalized Subsequent to Acquisition	953,089
Gross Carrying Amount, Land	687,582
Gross Carrying Amount, Building and Improvements	2,841,789
Accumulated Depreciation and Amortization	(847,390)	$ (754,140)	$ (665,222)	$ (590,338)
The aggregate tax basis for Federal tax purposes	2,500,000
Alamo Quarry Market
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2021	0
Initial Cost, Land	26,396
Initial Cost, Building and Improvements	109,294
Cost Capitalized Subsequent to Acquisition	21,557
Gross Carrying Amount, Land	26,816
Gross Carrying Amount, Building and Improvements	130,431
Accumulated Depreciation and Amortization	(68,138)
Carmel Country Plaza
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2021	0
Initial Cost, Land	4,200
Initial Cost, Building and Improvements	0
Cost Capitalized Subsequent to Acquisition	13,235
Gross Carrying Amount, Land	4,200
Gross Carrying Amount, Building and Improvements	13,235
Accumulated Depreciation and Amortization	(9,361)
Carmel Mountain Plaza
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2021	0
Initial Cost, Land	22,477
Initial Cost, Building and Improvements	65,217
Cost Capitalized Subsequent to Acquisition	37,619
Gross Carrying Amount, Land	31,034
Gross Carrying Amount, Building and Improvements	94,279
Accumulated Depreciation and Amortization	(50,201)
Del Monte Center
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2021	0
Initial Cost, Land	27,412
Initial Cost, Building and Improvements	87,570
Cost Capitalized Subsequent to Acquisition	34,958
Gross Carrying Amount, Land	27,117
Gross Carrying Amount, Building and Improvements	122,823
Accumulated Depreciation and Amortization	(73,187)
Gateway Marketplace
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2021	0
Initial Cost, Land	17,363
Initial Cost, Building and Improvements	21,644
Cost Capitalized Subsequent to Acquisition	1,239
Gross Carrying Amount, Land	17,363
Gross Carrying Amount, Building and Improvements	22,883
Accumulated Depreciation and Amortization	(3,767)
Geary Marketplace
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2021	0
Initial Cost, Land	8,239
Initial Cost, Building and Improvements	12,353
Cost Capitalized Subsequent to Acquisition	227
Gross Carrying Amount, Land	8,239
Gross Carrying Amount, Building and Improvements	12,580
Accumulated Depreciation and Amortization	(3,593)
Hassalo on Eighth - Retail
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2021	0
Initial Cost, Land	0
Initial Cost, Building and Improvements	0
Cost Capitalized Subsequent to Acquisition	29,044
Gross Carrying Amount, Land	597
Gross Carrying Amount, Building and Improvements	28,447
Accumulated Depreciation and Amortization	(7,821)
Lomas Santa Fe Plaza
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2021	0
Initial Cost, Land	8,600
Initial Cost, Building and Improvements	11,282
Cost Capitalized Subsequent to Acquisition	14,081
Gross Carrying Amount, Land	8,620
Gross Carrying Amount, Building and Improvements	25,343
Accumulated Depreciation and Amortization	(18,707)
The Shops at Kalakaua
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2021	0
Initial Cost, Land	13,993
Initial Cost, Building and Improvements	10,817
Cost Capitalized Subsequent to Acquisition	144
Gross Carrying Amount, Land	14,006
Gross Carrying Amount, Building and Improvements	10,948
Accumulated Depreciation and Amortization	(5,342)
Solana Beach Towne Centre
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2021	0
Initial Cost, Land	40,980
Initial Cost, Building and Improvements	38,842
Cost Capitalized Subsequent to Acquisition	4,577
Gross Carrying Amount, Land	40,980
Gross Carrying Amount, Building and Improvements	43,419
Accumulated Depreciation and Amortization	(15,212)
South Bay Marketplace
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2021	0
Initial Cost, Land	4,401
Initial Cost, Building and Improvements	0
Cost Capitalized Subsequent to Acquisition	12,653
Gross Carrying Amount, Land	4,401
Gross Carrying Amount, Building and Improvements	12,653
Accumulated Depreciation and Amortization	(8,383)
Waikele Center
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2021	0
Initial Cost, Land	55,593
Initial Cost, Building and Improvements	126,858
Cost Capitalized Subsequent to Acquisition	43,617
Gross Carrying Amount, Land	70,644
Gross Carrying Amount, Building and Improvements	155,424
Accumulated Depreciation and Amortization	(71,661)
City Center Bellevue
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2021	111,000
Initial Cost, Land	25,135
Initial Cost, Building and Improvements	190,998
Cost Capitalized Subsequent to Acquisition	57,802
Gross Carrying Amount, Land	25,135
Gross Carrying Amount, Building and Improvements	248,800
Accumulated Depreciation and Amortization	(73,173)
First & Main
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2021	0
Initial Cost, Land	14,697
Initial Cost, Building and Improvements	109,739
Cost Capitalized Subsequent to Acquisition	11,260
Gross Carrying Amount, Land	14,697
Gross Carrying Amount, Building and Improvements	120,999
Accumulated Depreciation and Amortization	(37,427)
The Land Mark at One Market
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2021	0
Initial Cost, Land	34,575
Initial Cost, Building and Improvements	141,196
Cost Capitalized Subsequent to Acquisition	32,405
Gross Carrying Amount, Land	34,575
Gross Carrying Amount, Building and Improvements	173,601
Accumulated Depreciation and Amortization	(47,420)
Lloyd District Portfolio
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2021	0
Initial Cost, Land	18,660
Initial Cost, Building and Improvements	61,401
Cost Capitalized Subsequent to Acquisition	104,807
Gross Carrying Amount, Land	11,845
Gross Carrying Amount, Building and Improvements	173,023
Accumulated Depreciation and Amortization	(50,452)
One Beach Street
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2021	0
Initial Cost, Land	15,332
Initial Cost, Building and Improvements	18,017
Cost Capitalized Subsequent to Acquisition	20,378
Gross Carrying Amount, Land	15,332
Gross Carrying Amount, Building and Improvements	38,395
Accumulated Depreciation and Amortization	(4,456)
Solana Beach Corporate Centre I-II
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2021	0
Initial Cost, Land	7,111
Initial Cost, Building and Improvements	17,100
Cost Capitalized Subsequent to Acquisition	8,166
Gross Carrying Amount, Land	7,111
Gross Carrying Amount, Building and Improvements	25,266
Accumulated Depreciation and Amortization	(8,342)
Solana Beach Corporate Centre III-IV
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2021	0
Initial Cost, Land	7,298
Initial Cost, Building and Improvements	27,887
Cost Capitalized Subsequent to Acquisition	6,271
Gross Carrying Amount, Land	7,298
Gross Carrying Amount, Building and Improvements	34,158
Accumulated Depreciation and Amortization	(10,859)
Solana Beach Corporate Centre Land
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2021	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
Torrey Plaza
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2021	0
Initial Cost, Land	4,095
Initial Cost, Building and Improvements	0
Cost Capitalized Subsequent to Acquisition	59,936
Gross Carrying Amount, Land	5,408
Gross Carrying Amount, Building and Improvements	58,623
Accumulated Depreciation and Amortization	(23,260)
Pacific North Court
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2021	0
Initial Cost, Land	3,263
Initial Cost, Building and Improvements	0
Cost Capitalized Subsequent to Acquisition	28,599
Gross Carrying Amount, Land	4,309
Gross Carrying Amount, Building and Improvements	27,553
Accumulated Depreciation and Amortization	(13,860)
Pacific South Court
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2021	0
Initial Cost, Land	3,285
Initial Cost, Building and Improvements	0
Cost Capitalized Subsequent to Acquisition	40,015
Gross Carrying Amount, Land	4,226
Gross Carrying Amount, Building and Improvements	39,074
Accumulated Depreciation and Amortization	(17,795)
Pacific VC
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2021	0
Initial Cost, Land	1,413
Initial Cost, Building and Improvements	0
Cost Capitalized Subsequent to Acquisition	10,637
Gross Carrying Amount, Land	2,148
Gross Carrying Amount, Building and Improvements	9,902
Accumulated Depreciation and Amortization	(6,076)
Pacific Torrey Daycare
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2021	0
Initial Cost, Land	715
Initial Cost, Building and Improvements	0
Cost Capitalized Subsequent to Acquisition	1,963
Gross Carrying Amount, Land	911
Gross Carrying Amount, Building and Improvements	1,767
Accumulated Depreciation and Amortization	(1,040)
Torrey Reserve Building 6
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2021	0
Initial Cost, Land	0
Initial Cost, Building and Improvements	0
Cost Capitalized Subsequent to Acquisition	8,012
Gross Carrying Amount, Land	682
Gross Carrying Amount, Building and Improvements	7,330
Accumulated Depreciation and Amortization	(2,372)
Torrey Reserve Building 5
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2021	0
Initial Cost, Land	0
Initial Cost, Building and Improvements	0
Cost Capitalized Subsequent to Acquisition	4,012
Gross Carrying Amount, Land	1,017
Gross Carrying Amount, Building and Improvements	2,995
Accumulated Depreciation and Amortization	(678)
Torrey Reserve Building 13 & 14
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2021	0
Initial Cost, Land	0
Initial Cost, Building and Improvements	0
Cost Capitalized Subsequent to Acquisition	16,139
Gross Carrying Amount, Land	2,188
Gross Carrying Amount, Building and Improvements	13,951
Accumulated Depreciation and Amortization	(3,566)
Torrey Point
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2021	0
Initial Cost, Land	2,073
Initial Cost, Building and Improvements	741
Cost Capitalized Subsequent to Acquisition	49,779
Gross Carrying Amount, Land	5,050
Gross Carrying Amount, Building and Improvements	47,543
Accumulated Depreciation and Amortization	(5,496)
La Jolla Commons One & Two
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2021	0
Initial Cost, Land	62,312
Initial Cost, Building and Improvements	393,662
Cost Capitalized Subsequent to Acquisition	2,507
Gross Carrying Amount, Land	62,312
Gross Carrying Amount, Building and Improvements	396,169
Accumulated Depreciation and Amortization	(34,627)
La Jolla Commons - Land
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2021	0
Initial Cost, Land	20,446
Initial Cost, Building and Improvements	0
Cost Capitalized Subsequent to Acquisition	37,003
Gross Carrying Amount, Land	20,446
Gross Carrying Amount, Building and Improvements	37,003
Accumulated Depreciation and Amortization	0
Imperial Beach Gardens
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2021	0
Initial Cost, Land	1,281
Initial Cost, Building and Improvements	4,820
Cost Capitalized Subsequent to Acquisition	6,085
Gross Carrying Amount, Land	1,281
Gross Carrying Amount, Building and Improvements	10,905
Accumulated Depreciation and Amortization	(8,692)
Loma Palisades
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2021	0
Initial Cost, Land	14,000
Initial Cost, Building and Improvements	16,570
Cost Capitalized Subsequent to Acquisition	34,101
Gross Carrying Amount, Land	14,052
Gross Carrying Amount, Building and Improvements	50,619
Accumulated Depreciation and Amortization	(31,846)
Mariner's Point
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2021	0
Initial Cost, Land	2,744
Initial Cost, Building and Improvements	4,540
Cost Capitalized Subsequent to Acquisition	1,902
Gross Carrying Amount, Land	2,744
Gross Carrying Amount, Building and Improvements	6,442
Accumulated Depreciation and Amortization	(4,236)
Santa Fe Park Rv Resort
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2021	0
Initial Cost, Land	401
Initial Cost, Building and Improvements	928
Cost Capitalized Subsequent to Acquisition	1,460
Gross Carrying Amount, Land	401
Gross Carrying Amount, Building and Improvements	2,388
Accumulated Depreciation and Amortization	(1,613)
Pacific Ridge Apartments
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2021	0
Initial Cost, Land	47,971
Initial Cost, Building and Improvements	178,497
Cost Capitalized Subsequent to Acquisition	2,831
Gross Carrying Amount, Land	47,971
Gross Carrying Amount, Building and Improvements	181,328
Accumulated Depreciation and Amortization	(31,341)
Hassalo on Eighth - Residential
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2021	0
Initial Cost, Land	0
Initial Cost, Building and Improvements	0
Cost Capitalized Subsequent to Acquisition	178,503
Gross Carrying Amount, Land	6,219
Gross Carrying Amount, Building and Improvements	172,284
Accumulated Depreciation and Amortization	(37,589)
Waikiki Beach Walk - Retail
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2021	0
Initial Cost, Land	45,995
Initial Cost, Building and Improvements	74,943
Cost Capitalized Subsequent to Acquisition	971
Gross Carrying Amount, Land	45,995
Gross Carrying Amount, Building and Improvements	75,914
Accumulated Depreciation and Amortization	(25,065)
Waikiki Beach Walk Hotel
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2021	0
Initial Cost, Land	30,640
Initial Cost, Building and Improvements	60,029
Cost Capitalized Subsequent to Acquisition	14,033
Gross Carrying Amount, Land	30,640
Gross Carrying Amount, Building and Improvements	74,062
Accumulated Depreciation and Amortization	(28,201)
Eastgate Office Park
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2021	0
Initial Cost, Land	35,822
Initial Cost, Building and Improvements	82,737
Cost Capitalized Subsequent to Acquisition	490
Gross Carrying Amount, Land	35,822
Gross Carrying Amount, Building and Improvements	83,227
Accumulated Depreciation and Amortization	(1,854)
Corporate Campus East III
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance as of December 31, 2021	0
Initial Cost, Land	23,203
Initial Cost, Building and Improvements	55,992
Cost Capitalized Subsequent to Acquisition	11
Gross Carrying Amount, Land	23,203
Gross Carrying Amount, Building and Improvements	56,003
Accumulated Depreciation and Amortization	$ (681)

SCHEDULE III-Consolidated Rea_3

SCHEDULE III-Consolidated Real Estate and Accumulated Depreciation Rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Real estate assets
Balance, beginning of period	$ 3,246,874	$ 3,188,697	$ 2,630,191
Property acquisitions	197,754	0	476,421
Improvements	93,455	64,997	101,285
Cost of Real Estate Sold	0	0	(8,845)
Other	(8,712)	(6,820)	(10,355)
Balance, end of period	3,529,371	3,246,874	3,188,697
Accumulated depreciation
Balance, beginning of period	754,140	665,222	590,338
Additions-depreciation	101,962	95,738	85,428
Cost of Real Estate Sold	0	0	(189)
Other	(8,712)	(6,820)	(10,355)
Balance, end of period	$ 847,390	$ 754,140	$ 665,222