In October 1967, defendant, a mathematician, under an assumed name, rented an office on the second floor of a building in Hollywood which was over the mezzanine of a bank. Directly below the mezzanine was the vault of the bank. Defendant was aware of the layout of the building, specifically of the relation of the office he rented to the bank vault. Defendant paid rent for the period from October 23 to November 23. The landlord had 10 days before commencement of the rental period within which to finish some interior repairs and painting. During this prerental period, defendant brought into the office certain equipment. This included drilling tools, two acetylene gas tanks, a blow torch, a blanket, and a linoleum rug. The landlord observed these items when he came in from time to time to see how the repair work was progressing.