Towell standing in for Powell during the seismic upgrade back in 1992 thus being called (Towell) Temporary Powell Staging Facility.
From 1992 to 1996 Towell was Powell to many students. A canvas and aluminum tent structure painted yellow and white with exposed fasteners to keep it up. The structure was at the bottom of Janns [sic] steps between the Students Activities Center and the dance building.
Source: (Complete with typo - a typo from the library - tsk, tsk):