It is located on the north side of School Street, from which it is separated by a low stone retaining wall dating to the 19th century.

Each of the wings is fronted by two bands of three sash windows on each level, which share stone sills and lintels and are divided within each group by panels of dark brick.

The central pavilion has groups of four windows on either side of the main entrance, similarly styled except that the dividing panels are considerably narrower.

Continued growth prompted the addition of the two wings in 1915, which were designed by George Funk and William Wilcox.

The central pavilion was built in 1937 with funding support from the federal Public Works Administration, a Depression-era jobs program.