The photo shows the scale model that Meyer and Fauver Associates used in their presentation to the Library trustees. (Do architects still build scale models now, or do they merely present soulless computer generated renderings?)
post showing what was on the library's site originally: a Sunoco gas station (shown at left).
Apparently in 1952 the fact that the Sun Oil Company's lease on the property was for four more years really gummed up the works, although it appears that the library managed to get them out a year early.
I'll bet the Cities Service station nearby on Reid didn't mind a bit that one of its competitors was sacrificed in the name of knowledge.