The first official building of Mambugan National High School (ACG Bldg) was built last 2003 with four (4) rooms in its own site located at Ruhat Hills, Siruna Village with a total land area of 3,200 m2. The ACG Bldg. was used by the second batch of students during their fourth year. The first graduation of Mambugan National High School on the new site last April 2004 with 215 graduates.
