In addition to an annex behind the original schoolhouse, the campus of the old Glenwood High School has a slightly more modern auditorium (above) built in 1951.
The original building is a one-story Spanish Mission Revival structure (not pictured due to inability to access) built in 1920; the two-story annex (above) was added between 1930-1933. In recent years, it has served as the campus for the Transitional Alternative Prep School.
National Register of Historic Places
The front 1/3 of the two story annex was added sometimes after WW II, about 1948-50. My Dad, Willard McDaniel, was a carpenter on the add-on.