Onyx Court (New York City, New York)

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6-story Beaux-Arts/Neo-Classical cooperative-apartment building completed in 1902. Designed by Harde & Short, it is clad in tan brick with beige stone trim, above a stone ground floor, painted blue-grey along the south facade and the southern part of the east facade, where there is a storefront. The main entrance is at the middle of the east facade, with wrought-iron-and-glass double-doors, sidelights, and transom set in a limestone surround. The ground floor is banded to the north, with a single-window bay and a double-window with an escutcheon on top. A dentiled stone cornice runs across the top of the ground floor, projecting out slightly at the end bays of the east facade. At the north bay, a pair of elaborate stone brackets support the projecting cornice section and the bay above it.

The upper floors facing the avenue have four bays of single-windows in the middle, and double-window end bays. They have stout cornices with large scrolled brackets; those on the 3rd & 6th floors are topped by rounded pediments. The southwest corner is rounded, with a single-window bay.

The south facade on 12th Street has a section of the storefront space at the east end, and no other openings at the ground floor. The upper floors have two wings created by a deep light well in the middle. The east wing has three narrow single-windows, and another single-window bay at the rounded inner corner. The west wing has a single-window and a double-window, and another single-window bay at its rounded inner corner. Both wings have a single-window near the rear of the side walls of the light well, and the rear wall of the light well has two single-windows. These all have the same style of thick bracketed cornices, again with rounded pediments at the 3rd & 6th floors.

There is a black metal fire escape over the middle bays of the east facade, and prominent, black metal roof cornice with modillions and dentils crowns the east facade as well as both wings on the south facade, following the inner corners but not extending farther into the light well. The building was converted to a co-op in 1983, with 16 apartments. The ground floor is occupied by Plantshed flower shop and cafe.