The 18.7-acre vacant former site of the Gillman auto dealership on Bellaire Blvd. at Fondren will soon become an extension campus of a Catholic girls’ high school down the road. The main campus of St. Agnes Academy will remain at 9000 Bellaire Blvd., next to Strake Jesuit between Gessner and Ranchester, which the school calls “landlocked.” This new site a little more than a mile to the east — purchased just Wednesday — will likely become the new home of the school’s athletic facilities, to allow for expansion on the main campus. If that happens, the Catholic school’s sports teams will play on fields across Bellaire Blvd. from Plazamericas — formerly known as the Sharpstown Mall. St. Agnes Academy moved to its current site in 1963, after almost 60 years in Midtown.