Cover - shares	3 Months Ended
	Mar. 31, 2022	May 03, 2022
Class of Stock [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2022
Document Transition Report	false
Entity File Number	000-55605
Entity Registrant Name	Griffin Realty Trust, Inc.
Entity Incorporation, State or Country Code	MD
Entity Tax Identification Number	46-4654479
Entity Address, Address Line One	1520 E. Grand Ave
Entity Address, City or Town	El Segundo
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	90245
City Area Code	310
Local Phone Number	606-3200
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 Central Index Key	0001600626
Amendment Flag	false
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
Class T
Class of Stock [Line Items]
Entity Common Stock, Shares Outstanding		565,265
Class S
Class of Stock [Line Items]
Entity Common Stock, Shares Outstanding		1,801
Class D
Class of Stock [Line Items]
Entity Common Stock, Shares Outstanding		42,013
Class I
Class of Stock [Line Items]
Entity Common Stock, Shares Outstanding		1,911,818
Class A
Class of Stock [Line Items]
Entity Common Stock, Shares Outstanding		24,509,573
Class AA
Class of Stock [Line Items]
Entity Common Stock, Shares Outstanding		47,592,117
Class AAA
Class of Stock [Line Items]
Entity Common Stock, Shares Outstanding		926,935
Class E
Class of Stock [Line Items]
Entity Common Stock, Shares Outstanding		249,166,309