This subseries contains photographs of buildings and photographic reproductions of architectural renderings pertaining to the architectural projects William T. McCarthy designed or worked on throughout his career. Included in this series are photographs of buildings in Brooklyn, mostly apartment buildings, including a street view of the Henrick House Apartments in the Flatbush area of Brooklyn; an exterior photograph of the Bryn Mawr Apartments and exterior and interior photographs of the Chateau Frontenac Apartments also in Brooklyn; two black-and-white exterior photographs of the Cathedral Arms Apartments in Brooklyn; a reproduction of a black-and-white pencil drawing by McCarthy of additions to The House of St. Giles the Cripple in Brooklyn; photographic reproductions of architectural renderings of the Gowanus Houses, the Red Hook Houses, and Concord Village, all in Brooklyn; black-and-white exterior photographs of the Red Hook Houses circa 1940 and an aerial view of the Red Hook Houses construction site before construction began; two black-and-white photographs of the National Surety Corporation, A.L. Carr Agency building in Brooklyn Heights circa 1930; and exterior views of single-family homes in the Park Slope neighborhood of Brooklyn. The single-family homes were designed by McCarthy and include 63, 64, and 65 Prospect Park West. They were some of the last single-family homes built in Park Slope and were designed to include driveways.
Delineators of the renderings include Schell Lewis, Arthur Frappier, and S.L. Snodgrass.
Also included in this subseries is a photograph of a dog, "Cricket," mounted with memorial text apparently written by McCarthy.