Fitz and Kaufman sometimes used real places to inspire the backgrounds.
Both the Electra and the Eldo called their backgrounds the "Longchamps Clubhouse". I looked and couldn't find that exaact ocation .. but "Longchamps" was (is?) and upscale restaurant chain (about 10 locations) in NYC back then.
Buick in #250 used CBS Television Studios in Hollywoood CA as it back drop That canopy in the illustration is hiding the CBS "eye":