Ostad is a urologist and real estate investor. The historic house, known as "Bagatelle", was built in 1913 by and for Thomas Hastings, a famous architect at the time, partner at Carrère and Hastings. The 16,828 sq.ft. mansion has been listed for sale for more than five years now. Its current price is $7,888,000.
Abraham Ostad
http://en.wikipedia.org/wiki/Thomas_Hastings_%28architect%29