The Company and Basis of Presentation and Going Concern	3 Months Ended
Mar. 31, 2017
The Company and Basis of Presentation and Going Concern [Abstract]
The Company and Basis of Presentation and Going Concern	Note 1 – The Company and Basis of Presentation and Going Concern The accompanying condensed consolidated financial statements of AmBase Corporation and subsidiaries ("AmBase" or the "Company") are unaudited and subject to year-end adjustments. All material intercompany transactions and balances have been eliminated. In the opinion of management, these financial statements reflect all adjustments, consisting only of normal recurring adjustments unless otherwise disclosed, necessary for a fair presentation of the Company's consolidated financial position, results of operations and cash flows. Results for interim periods are not necessarily indicative of results for the full year. The condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") for interim financial information and with the instructions to Form 10-Q and Article 8 of Regulation S-X. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that it deems reasonable, that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from such estimates and assumptions. The unaudited interim condensed consolidated financial statements presented herein are condensed and should be read in conjunction with the Company's consolidated financial statements filed in its Annual Report on Form 10-K for the year ended December 31, 2016. The Company's assets currently consist primarily of cash and cash equivalents, an equity investment in a real estate development property and real estate owned. As further discussed in Note 4, the Company owns an equity interest in a real estate development property through a joint venture agreement to purchase and develop real property located at 105 through 111 West 57^th Street in New York, New York (the "111 West 57^th Property"). The Company is engaged in the management of its assets and liabilities. A fundamental principle of the preparation of financial statements in accordance with GAAP is the assumption that an entity will continue in existence as a going concern, which contemplates continuity of operations and the realization of assets and settlement of liabilities occurring in the ordinary course of business. In accordance with this requirement, the Company has prepared its accompanying condensed consolidated financial statements assuming the Company will continue as a going concern. The Company has incurred operating losses and used cash for operating activities for the past several years. The Company has also made significant investments in the 111 West 57th Street Property since 2013. The Company has continued to keep operating expenses at a reduced level; however, there can be no assurance that the Company's current level of operating expenses will not increase or that other uses of cash will not be necessary. The Company believes that based on its current level of operating expenses, its currently available cash resources together with the line of credit from Mr. R.A. Bianco as further discussed in Note 10 herein, may not be sufficient to cover operating cash needs through the twelve month period from the financial statement reporting date. Based on the above factors, management determined there is substantial doubt about the Company's ability to continue as a going concern within one year after the date that the financial statements are issued. The accompanying condensed consolidated financial statements have been prepared assuming that the Company will continue as a going concern. The financial statements do not include adjustments to the carrying value of assets and liabilities which might be necessary should the Company not continue in operation. Over the next several months, the Company will seek to manage its current level of cash and cash equivalents, through various ways, including but not limited to, reducing operating expenses, possible asset sales and/or long term borrowings, although this cannot be assured. In order to continue on a long-term basis, the Company must raise additional capital through the sale of assets or long term borrowings. There can be no assurance that the Company will be able to attain such financing at terms acceptable to the Company, if at all.

Note 1 – The Company and Basis of Presentation and Going Concern

The accompanying condensed consolidated financial statements of AmBase Corporation and subsidiaries ("AmBase" or the "Company") are unaudited and subject to year-end adjustments. All material intercompany transactions and balances have been eliminated. In the opinion of management, these financial statements reflect all adjustments, consisting only of normal recurring adjustments unless otherwise disclosed, necessary for a fair presentation of the Company's consolidated financial position, results of operations and cash flows. Results for interim periods are not necessarily indicative of results for the full year. The condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") for interim financial information and with the instructions to Form 10-Q and Article 8 of Regulation S-X. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that it deems reasonable, that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from such estimates and assumptions. The unaudited interim condensed consolidated financial statements presented herein are condensed and should be read in conjunction with the Company's consolidated financial statements filed in its Annual Report on Form 10-K for the year ended December 31, 2016.

The Company's assets currently consist primarily of cash and cash equivalents, an equity investment in a real estate development property and real estate owned. As further discussed in Note 4, the Company owns an equity interest in a real estate development property through a joint venture agreement to purchase and develop real property located at 105 through 111 West 57^th Street in New York, New York (the "111 West 57^th Property"). The Company is engaged in the management of its assets and liabilities.

A fundamental principle of the preparation of financial statements in accordance with GAAP is the assumption that an entity will continue in existence as a going concern, which contemplates continuity of operations and the realization of assets and settlement of liabilities occurring in the ordinary course of business. In accordance with this requirement, the Company has prepared its accompanying condensed consolidated financial statements assuming the Company will continue as a going concern.

The Company has incurred operating losses and used cash for operating activities for the past several years. The Company has also made significant investments in the 111 West 57th Street Property since 2013. The Company has continued to keep operating expenses at a reduced level; however, there can be no assurance that the Company's current level of operating expenses will not increase or that other uses of cash will not be necessary. The Company believes that based on its current level of operating expenses, its currently available cash resources together with the line of credit from Mr. R.A. Bianco as further discussed in Note 10 herein, may not be sufficient to cover operating cash needs through the twelve month period from the financial statement reporting date. Based on the above factors, management determined there is substantial doubt about the Company's ability to continue as a going concern within one year after the date that the financial statements are issued. The accompanying condensed consolidated financial statements have been prepared assuming that the Company will continue as a going concern. The financial statements do not include adjustments to the carrying value of assets and liabilities which might be necessary should the Company not continue in operation.

Over the next several months, the Company will seek to manage its current level of cash and cash equivalents, through various ways, including but not limited to, reducing operating expenses, possible asset sales and/or long term borrowings, although this cannot be assured. In order to continue on a long-term basis, the Company must raise additional capital through the sale of assets or long term borrowings. There can be no assurance that the Company will be able to attain such financing at terms acceptable to the Company, if at all.