There were only a few permanent buildings in the Diliman campus then: the Administration, later to be called Quezon Hall; Liberal Arts, now Palma Hall; Engineering, now Melchor Hall; Law, now Malcolm Hall; Education, now Benitez Hall, and UP High. Most of the rectangular-shaped structures in the map were quonset huts, whose G.I. roofing arced and also served as walls. The Conservatory of Music, precursor of the College of Music, was in Area 1, occupying what looks like quonset huts in the map.
The University Theater and the University Gym were at the back of the College of Engineering, and so was the Infirmary. The Social Hall, where monthly socials used to be held, was in a makeshift building just across College of Law (there was no Law Center yet).
The UP ecumenical chapel was a big makeshift hut, located near the present site of the Church of the Holy Sacrifice. There were eateries, including Little Quiapo, which were in the other end of the same site.
There was a golf course in Area 17, with the golf club house where the Faculty Center is now. There were several quonset huts which served as a dormitory for men, where Ipil and Yakal residence halls are now. There was also an observatory facing Tandang Sora st., near the College of Education and across the old UP High.
Photo of map is from the book, Ordinary Heroes and Discovered Icons of the UP High Class ’57 (2010). Courtesy of Rolando Pena, BS Geology ’72.