Old Chem [ohld·kem] n. the old Chemistry building, which had been closed (due to being deemed unsound and unsafe) for eons after earthquake damage, because of the projected cost of a seismic retrofit. *also, var. Old Chemistry.
NOTE: Building is an example a more grand architectural period and was not torn down due to historical significance; it could still be accessed (so a friend told me, ahem) without authorization via the steam tunnels. --Ed.