My post and photos from 2009 are below.
A helpful correspondent has explained: "The Franciscan Brothers Residence was the top floor of Bishop Ford. They now occupy a smaller section with their own chapel on their floor. The other space is used for the school ."
The Prospect Expressway (NY 27) parallels Nineteenth Street. When the bishop of Brooklyn announced the construction of several diocesan high schools about 1960, suitable property was scarce. In this case, a streetcar barn took up the entire block now used by Bishop Ford High School. These streets border the school: on the northeast, Fifteenth Street, seen above; on the southeast Tenth Avenue, marked in the above photo by the tall transmitter of the diocesan television station; on the southwest Twentieth Street and Green-Wood Cemetery, and on the northwest Prospect Park West.