Continued population increases in larger cities required even more space in schools. The architectural response to this was to expand out. The horizontal school type is easily recognized by its multi-story, broad presence on the site. The building entrance is typically in the center of the rectangular primary façade, often at the top of a large stairway. As with the school blocks, the walls on horizontal schools are punctuated by multiple windows to allow light into the individual classrooms, which are situated along single or double-loaded corridors. Sometimes, wings off the rear of the building allow for more window area in classrooms.
Along with the school building, the campus might include other buildings, including heating plants and workshops. Because the majority of these school buildings were constructed in the 1920s-1930s, architects incorporated various classical and period revival styles into their designs.