From Episode #157, The Case of the Double-entry Mind

The Bradbury Building
Located at 304 South Broadway in Downtown Los Angeles. The building dates from 1893.
This interior was also seen in the futuristic movie Blade Runner (1982).

View near the end of the elevator ride in the opening scene.

A recent view of the Bradbury Building interior courtesy Great Buildings Online.

[Location Trivia][Perry Mason TV Series]