Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2020	Nov. 06, 2020
Document and Entity Information
Document Type	10-Q
Amendment Flag	false
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2020
Document Transition Report	false
Entity File Number	001-08546
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3
Entity Registrant Name	TRINITY PLACE HOLDINGS INC.
Entity Central Index Key	0000724742
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	22-2465228
Entity Address, Address Line One	340 Madison Avenue
Entity Address, City or Town	New York
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10173
City Area Code	212
Local Phone Number	235-2190
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Current Reporting Status	Yes
Trading Symbol	TPHS
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Interactive Data Current	Yes
Title of 12(b) Security	Common Stock
Security Exchange Name	NYSE
Entity Common Stock, Shares Outstanding		32,172,107