Northwestern Studios, 1916
This is a not the kind of advertising sign I'm normally looking for but I thought I'd highlight this missing sign (or plaque), if for no other reason than its impact on popular culture. This building housed the Northwestern Studios in 1963 when The Kingsmen recorded perhaps the best-known version of "Louie Louie" here.
The first photo below shows some vertical white stripes surrounded by four holes. At one time there was a brass plaque here, noting that this was the recording site. It was stolen long ago, leaving nothing but some glue and holes. Soon the whole thing will be gone; the site will be demolished to make way for the new Weave Building. The "ENTRANCE ON 14th STREET" sign, partially visible in the upper-left of the lower photo, will disappear forever too.
See it while you can at SW 13th and West Burnside.