823 MADISON AVENUE Unique opportunity to take an entire building on Manhattan's most dramatic designer corridor. On Madison Avenue, with 27 feet of frontage between 68th and 69th streets, this retail palace is spread over 5,900 SF on four levels: 1,700 SF on the ground level, 2,000 SF on the second, 1,600 SF on the third, and 600 SF of basement. Building must be leased in its entirety. Previously Ermenegildo Zegna.