521 Madison Avenue

 office building, commercial building

8-story office building originally completed in 1930. The facade was redesigned in the late 1900s. It is clad in limestone framing infill of dark-green tinted glass and silver aluminum framing. The ground floor has a glass door at the south end, serving both the upper floors and the ground-floor plate-glass storefront to the left.

The 2nd & 3rd floors have bands of four windows. Between the piers there is a curtain wall of glass and metal (four panes wide) running from the 4th-8th floors, and angling back at the 7th, before running vertically again at the top floor. The limestone at the edges also angled back at the top two floors. The ground floor is occupied by Eileen Fisher womenswear, with Castangia clothing store on the 2nd floor.