United States Post Office and Sub-Treasury Building (Boston)

United States Post Office and Sub-Treasury Building
The Post Office and Sub-Treasury Building from across Post Office Square, c. 1900
General information
Architectural style	Second Empire
Location	Post Office Square, Boston, Massachusetts
Coordinates	42°21′26″N 71°03′25″W / 42.357222°N 71.056944°W / 42.357222; -71.056944
Construction started	1869
Completed	1885
Demolished	1929
Height	126 ft (38 m)
Technical details
Floor area	51,372 sq ft (4,772.6 m2)
Design and construction
Architect(s)	Alfred B. Mullett William Appleton Potter
[1]

The United States Post Office and Sub-Treasury Building (demolished 1929) was a public building on Post Office Square in Boston, Massachusetts. Built in the late nineteenth century, it was the first post office building in the city to be owned by the United States federal government.^[2] The John W. McCormack Post Office and Courthouse now stands on its former site.