When MSC initially rented the old Agrix supermarket building, also known as MSC Annex, it had two classrooms and an office on the second floor; a computer lab, and two classrooms, and a small office on the first floor. The building was actually the front part of the Bunquin family compound. By June 1996, this building was used by the first three classes (1st to 3rd year) of the MSC High School.
After about a year, MSC also rented the back part of the property which was previously used by DOST as garage for their vehicles and quarters for its employees. Even after occupying the 4th floor of the La Suerte building, the growing number of students in both the high school and tech-voc departments necessitated the acquisition of more space.
During that time the MSC Annex was the most spacious site. The back area allowed for two more classrooms, a canteen, a small hall, music room, an office and a garage.