SPONSOR AND MANAGEMENT WARRANTS	6 Months Ended
SPONSOR AND MANAGEMENT WARRANTS	Jun. 30, 2017
SPONSOR AND MANAGEMENT WARRANTS
SPONSOR AND MANAGEMENT WARRANTS	NOTE 3 SPONSOR AND MANAGEMENT WARRANTS On November 9, 2010, we issued warrants to purchase 1,916,667 shares of our common stock (the “Sponsor Warrants”) to certain funds of Pershing Square Capital Management, L.P. (“Pershing Square”). The exercise price for the warrants of $50.00 per share and the number of shares of common stock underlying each warrant were subject to adjustment for future stock dividends, splits or reverse splits of our common stock or certain other events. In November 2010 and February 2011, we entered into certain agreements (the “Management Warrants”) with David R. Weinreb, our Chief Executive Officer, Grant Herlitz, our President, and Andrew C. Richardson, our former Chief Financial Officer, in each case prior to his appointment to such position, to purchase 2,367,985, 315,731 and 178,971 shares, respectively, of our common stock. The Management Warrants represent underlying shares, which may be adjusted pursuant to a net settlement option, and were issued pursuant to such agreements at fair value in exchange for a combined total of approximately $19.0 million in cash from such executives at the commencement of their respective employment. Mr. Weinreb and Mr. Herlitz’s warrants became exercisable in November 2016, and Mr. Weinreb and Mr. Herlitz’s warrants had an exercise price of $42.23 per share and Mr. Richardson’s warrants became exercisable in February 2017 and had an exercise price of $54.50 per share. Pershing Square exercised its Sponsor Warrants on June 30, 2017, resulting in a net issuance of 1,136,517 shares in accordance with the warrant provisions. Mr. Herlitz exercised his warrants in early January 2017, resulting in the net issuance of 198,184 shares in accordance with the warrant provisions. Mr. Herlitz also donated 6,850 shares to a charitable trust, which were net share settled for 4,400 shares in accordance with the warrant provisions. In February and March 2017, Mr. Richardson exercised 130,000 Management Warrants, resulting in the net issuance of 70,014 shares in accordance with the warrant provisions. In June 2017, Mr. Weinreb exercised all his 2,367,985 Management Warrants and Mr. Richardson exercised his remaining 48,971 Management Warrants, resulting in the net issuance of 1,614,803 and 28,535 shares, respectively, in accordance with the warrant provisions. As of June 30, 2017, all Sponsor and the original Management Warrants have been exercised. The fair values for the Sponsor and Management Warrants as of December 31, 2016 were recorded as liabilities because the holders of these warrants could require us to settle such warrants in cash upon a change of control. The estimated fair values for the outstanding Sponsor Warrants and Management Warrants were $123.5 million and $208.7 million, respectively, as of December 31, 2016. The fair values were estimated using an option pricing model and Level 3 inputs due to the unavailability of comparable market data, as further discussed in Note 7 – Fair Value of Financial Instruments in our Condensed Consolidated Financial Statements. Decreases and increases in the fair value of the Sponsor and Management Warrants were recognized as warrant liability gains or losses in the Condensed Consolidated Statements of Operations. On October 7, 2016, we entered into a management warrant agreement with our new Chief Financial Officer, David R. O’Reilly, prior to his appointment to the position. This warrant represents 50,125 underlying shares with an exercise price of $112.08 per share and was issued at fair value in exchange for $1.0 million in cash from Mr. O’Reilly. On June 16, 2017, we also entered into a new warrant agreement (“New CEO Warrant”) with Mr. Weinreb to acquire 1,965,409 shares for the purchase price of $50.0 million. The New CEO Warrant shall become exercisable on June 15, 2022, at an exercise price of $124.64 per share, subject to certain change in control, separation and termination provisions. The new warrants, which qualify as equity instruments, are included within additional paid-in capital in the Condensed Consolidated Balance Sheets at June 30, 2017 and December 31, 2016. At June 30, 2017, the New CEO Warrant is fully offset by a contribution receivable of $50.0 million from Mr. Weinreb. Mr. Weinreb has 75 days from June 16, 2017 per the terms of the warrant grant agreement to pay the purchase price of the New CEO Warrant.

Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable.