The ​3 ¹⁄₂-story, rectangular administration building features a terracotta parapet embellished with chevron designs and stylized eagles.
The basement is raised by half a story and contains a water table made of red sandstone.
Throughout the building, the first-story windows contain iron grilles with decorations depicting maces and stars.

The main facade, to the east, contains numerous recessed and projecting sections, alternating with each other.
This facade contains its main entrance pavilion in the center, and two asymmetric side pavilions to the north and south.
Above the entrance pavilion is a sandstone surround, which contains the carved letters "369th Infantry N.Y.C." and is flanked by eagle-wing motifs that contain lanterns.
The raised basement also contains entrances surrounded with sandstone trim.
Adjacent to the eastern facade is a circular driveway with an adjacent small parking lot.
A small lawn is located between the driveway and Fifth Avenue.
A statue to the 369th Regiment stands across Fifth Avenue from the administration building.
The northern and southern facades are located next to the sidewalks of 143rd and 142nd Streets, respectively.

Inside, the corridors contain terrazzo tile floors as well as cornices with chevron motifs.
A company meeting room is located at the administration building's southeast corner and includes parquet floors, a fireplace with a carved mantel, walls with walnut-wood paneling, and plaster walls and ceilings.

As originally proposed, the administration building was supposed to be five stories high and measuring 200 by 200 feet (61 by 61 m), surrounding a courtyard with dimensions of 75 by 100 feet (23 by 30 m).
The ground floor was to contain various living quarters, an officers' mess, a 600-person entertainment room, and a reception room.
Above that, each of the regiments' companies would have their own floor, and a top-floor suite for the regiment's colonel.
The ​3 ¹⁄₂-story, rectangular administration building features a terracotta parapet embellished with chevron designs and stylized eagles. The basement is raised by half a story and contains a water table made of red sandstone. Throughout the building, the first-story windows contain iron grilles with decorations depicting maces and stars.
The main facade, to the east, contains numerous recessed and projecting sections, alternating with each other. This facade contains its main entrance pavilion in the center, and two asymmetric side pavilions to the north and south. Above the entrance pavilion is a sandstone surround, which contains the carved letters "369th Infantry N.Y.C." and is flanked by eagle-wing motifs that contain lanterns. The raised basement also contains entrances surrounded with sandstone trim. Adjacent to the eastern facade is a circular driveway with an adjacent small parking lot. A small lawn is located between the driveway and Fifth Avenue. A statue to the 369th Regiment stands across Fifth Avenue from the administration building. The northern and southern facades are located next to the sidewalks of 143rd and 142nd Streets, respectively.
Inside, the corridors contain terrazzo tile floors as well as cornices with chevron motifs. A company meeting room is located at the administration building's southeast corner and includes parquet floors, a fireplace with a carved mantel, walls with walnut-wood paneling, and plaster walls and ceilings.
As originally proposed, the administration building was supposed to be five stories high and measuring 200 by 200 feet (61 by 61 m), surrounding a courtyard with dimensions of 75 by 100 feet (23 by 30 m). The ground floor was to contain various living quarters, an officers' mess, a 600-person entertainment room, and a reception room. Above that, each of the regiments' companies would have their own floor, and a top-floor suite for the regiment's colonel.
369th Regiment Armory