HABS elevations of the Administration Building ruins; its remaining walls are made of lime-grout concrete Administration Building Information The Administrative Building, built in 1884, currently stands in ruins. The Administrative Building housed the adjutant’s office, post school, library and a multi-purpose theater known as the amusement hall (NPS C.S.). The large (36 foot by 102 foot by 31 foot by 52 foot) L-shaped building is of lime grout concrete. The building’s wood components remain in fragments, much of the material having been scavenged during the homesteading era.