Additional extensions were constructed in 1953, and 1956. Demolition of the original structure compromised the integrity of the overall structure. In 2002, the Maryland Historical Trust (MHT) decided that the school was not eligible for inclusion in the National Register of Historic Places, because according to the MHT's judgment, the school was not an important example of post-World War II suburban development, Glenmont was not a significant part of Montgomery County's suburbanization history at the time, and the design of the building was fairly typical for the time.