The Pierre Hotel penthouse on Fifth Avenue has officially been listed for $125 million. It occupies the 41st, 42nd, and 43rd floors of the hotel and has 16 rooms, 6 bathrooms, 5 fireplaces and 4 terraces. Stock market analyst Martin Zweig, who died in February at the age of 70, was the previous owner. Zweig bought the home for $21.5 million in 1999. (Courtesy Zillow)