The second Improv venue on 8162 Melrose Avenue, Hollywood, sometime after 1979 (when Mark Lonow became a general partner). Note that the letterforms in this early version are close to Piccadilly, but not a perfect match, see e.g. P and R.
Source: https://goo.glGoogle Street View. License: All Rights Reserved.
The Improv on 8162 Melrose Avenue, Hollywood in 2019.