A curious form of establishing shot, addresses are seen throughout the series. A popular form is the vehicle registration. Sometimes, the address, such as 1040 N. Las Palmas Avenue, has a connection to the series.
From #89, The Case of the Crying Cherub
This address is that of General Service Studios where the show was filmed from 1959 to 1961.
From #100, The Case of the Lavender Lipstick
From #115, The Case of the Barefaced Witness