COVER PAGE - shares	3 Months Ended
	Mar. 31, 2021	May 06, 2021
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2021
Document Transition Report	false
Entity File Number	001-07172
Entity Registrant Name	BRT APARTMENTS CORP.
Entity Incorporation, State or Country Code	MD
Entity Tax Identification Number	13-2755856
Entity Address, Address Line One	60 Cutter Mill Road
Entity Address, City or Town	Great Neck
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	11021
City Area Code	516
Local Phone Number	466-3100
Title of 12(b) Security	Common Stock
Trading Symbol	BRT
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)		17,582,975
Amendment Flag	false
Entity Central Index Key	0000014846
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1