 In November, law firm Schiff Hardin signed a lease for of office space on the building's 16th and 17th floors.By 2010, an appraisal valued the building at just $820 million, less than half what Kushner Companies had paid three years earlier.At the end of 2011, Kushner brought in Vornado Realty Trust which purchased a 49.5% equity stake in the tower for just $80 million and the assumption of half the building's debt.