It is a roughly L-shaped two-story brick structure, with an original main section that has been added to several times.

Windows are generally rectangular, and set in openings with stone sills and splayed brick lintels.

[2] The original main block has matching wings extending to the east and west, with less elaborate brickwork.

It was sold to the diocese in 1946, which enlarged the building in 1949 and 1954 with the two side wings and convent.

It then stood vacant for a time, suffering from vandalism and neglect, which included the loss by fire of its gymnasium.