Legal Proceedings	3 Months Ended
Mar. 31, 2017
Legal Proceedings [Abstract]
Legal Proceedings	Note 9 - Legal Proceedings From time to time, the Company and its subsidiaries may be named as a defendant in various lawsuits or proceedings. At the current time except as set forth below, the Company is unaware of any legal proceedings pending against the Company. The Company intends to aggressively contest all litigation and contingencies, as well as pursue all sources for contributions to settlements. The Company is a party to a lawsuit as follows: AmBase v. 111 West 57^th Sponsor LLC, et al. In April 2016, the Company initiated a litigation in the New York State Supreme Court for New York County (the "NY Court"), Index No. 652301/2016, against defendants 111 West 57th Sponsor LLC, 111 West 57th JDS LLC, PMG West 57th Street LLC, 111 West 57th Control LLC, 111 West 57th Developer LLC, Elliot Joseph, 111 West 57^th KM Equity LLC, 111 West 57^th KM Group LLC, Kevin Maloney, Matthew Phillips, Michael Stern, Ned White and Franklin R. Kaiman (collectively, "Defendants") and nominal defendant 111 West 57th Partners LLC. AmBase alleges in this action that the Defendants engaged in an unlawful scheme to dilute AmBase's equity interest in the joint real estate venture 111 West 57^th Partners, to develop the 111 West 57^th Street Property and to keep for themselves certain financing opportunities in breach of Defendants' contractual and fiduciary duties. The complaint also alleges that defendants have failed to honor the exercise of AmBase's equity put right. AmBase is seeking compensatory damages, as well as punitive damages, indemnification and equitable relief including a declaration of the parties' rights, an accounting, and a constructive trust over distributions received by the Defendants. The complaint in this action has been filed and discovery is ongoing.

Note 9 - Legal Proceedings

From time to time, the Company and its subsidiaries may be named as a defendant in various lawsuits or proceedings. At the current time except as set forth below, the Company is unaware of any legal proceedings pending against the Company. The Company intends to aggressively contest all litigation and contingencies, as well as pursue all sources for contributions to settlements.

The Company is a party to a lawsuit as follows:

AmBase v. 111 West 57^th Sponsor LLC, et al. In April 2016, the Company initiated a litigation in the New York State Supreme Court for New York County (the "NY Court"), Index No. 652301/2016, against defendants 111 West 57th Sponsor LLC, 111 West 57th JDS LLC, PMG West 57th Street LLC, 111 West 57th Control LLC, 111 West 57th Developer LLC, Elliot Joseph, 111 West 57^th KM Equity LLC, 111 West 57^th KM Group LLC, Kevin Maloney, Matthew Phillips, Michael Stern, Ned White and Franklin R. Kaiman (collectively, "Defendants") and nominal defendant 111 West 57th Partners LLC. AmBase alleges in this action that the Defendants engaged in an unlawful scheme to dilute AmBase's equity interest in the joint real estate venture 111 West 57^th Partners, to develop the 111 West 57^th Street Property and to keep for themselves certain financing opportunities in breach of Defendants' contractual and fiduciary duties. The complaint also alleges that defendants have failed to honor the exercise of AmBase's equity put right. AmBase is seeking compensatory damages, as well as punitive damages, indemnification and equitable relief including a declaration of the parties' rights, an accounting, and a constructive trust over distributions received by the Defendants. The complaint in this action has been filed and discovery is ongoing.