Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2021	Mar. 31, 2022	Jun. 30, 2021
Document and Entity Information
Document Type	10-K/A
Document Period End Date	Dec. 31, 2021
Document Annual Report	true
Document Transition Report	false
Entity File Number	1-08546
Entity Registrant Name	TRINITY PLACE HOLDINGS INC.
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
Title of 12(b) Security	Common Stock $0.01 Par Value Per Share
Trading Symbol	TPHS
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
Current Fiscal Year End Date	--12-31
Entity Central Index Key	0000724742
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Amendment Flag	true
Entity Public Float			$ 49,736,000
ICFR Auditor Attestation Flag	false
Entity Common Stock, Shares Outstanding		36,836,146
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Auditor Name	BDO USA, LLP
Auditor Firm ID	243
Auditor Location	New York, New York
Amendment Description	Trinity Place Holdings Inc. (the "Company," "we", "our" or "us") is filing this Amendment No. 1 to the Annual Report on Form 10-K/A (the "Form 10-K/A" or "Amended Annual Report") to amend our Annual Report on Form 10-K for the years ended December 31, 2021 and 2020, included in the original filing with the Securities and Exchange Commission (the "SEC") on March 31, 2022 (the "Original Form 10-K"), to restate the financial statements as of and for the year ended December 31, 2021 and to restate and revise the financial statements as of and for the year ended December 31, 2020, and December 31, 2019, included in the Original Form 10-K. In August 2022, the Company determined that it made certain errors in accounting treatment regarding the overcapitalization of internally allocated construction related costs related to the development project at the 77 Greenwich property, as well as the presentation of the 77 Greenwich property on the consolidated balance sheets and in the statements of cash flows. The restatement is based on an error in the application of generally accepted accounting principles ("GAAP") as they relate to the capitalization of construction soft costs and internally allocated costs incurred in connection with a development project, which involves significant judgment. As a result, after consultation with BDO USA LLP ("BDO"), the Company's independent registered public accounting firm, the Company's audit committee concluded that the original financial statements included in the Original Form 10-K should no longer be relied upon and are to be restated in order to correct the error in accounting treatment.The Company also identified certain immaterial errors during the periods presented and have revised the consolidated financial statements for such errors as discussed in Note 3 and Note 16. This Amended Annual Report also amends and restates the Company's Management's Discussion and Analysis of Financial Condition and Results of Operations, Risk Factors and other disclosures made in the Original Form 10-K, as appropriate, to reflect the restatement of the relevant periods.In accordance with Rule 12b-15 under the Securities Exchange Act of 1934, as amended, or the Exchange Act, the Company is also including with this Amended Annual Report currently dated certifications of the Company's Chief Executive Officer and Principal Financial Officer (attached as Exhibits 31.1, 31.2, 32.1 and 32.2).As a result of the restatement, the Company has concluded there was a material weakness in its internal control over financial reporting as of December 31, 2021, and its disclosure controls and procedures were not effective. See additional discussion included in Part II, Item 9A of this Amended Annual Report.Except as discussed above, and as further described in Note 3 - Restatement of Previously Issued Financial Statements and Note 16 - Restatement of Previously Issued Interim Financial Statements in the Notes to Financial Statements, the Company has not modified or updated disclosures presented in this Amended Annual Report. Accordingly, the Amended Annual Report does not reflect events occurring after the Original Form 10-K or modify or update those disclosures affected by subsequent events. Information not affected by the restatement is unchanged and reflects disclosures made at the time of the filing of the Original Form 10-K.Other financial information that has been previously filed or otherwise reported for these periods is superseded by the information in this Amended Annual Report and in the amendment to our Quarterly Report on Form 10-Q for the period ended March 31, 2022 filed on the date hereof, and the financial statements and related financial information contained in such previously filed reports should no longer be relied upon.The restatement is more fully described in Note 3 and Note 16 of the Notes to Financial Statements included herein.