"Section of Main Floor"
The Big Busy Galena Street Dry Goods Store

It became Stukenberg's Department Store and Galena Street changed to Main Street.
This building burned down in the mid-1950s, I'd say about 1957.
This postcard doesn't appear to be dated, but it looks like the late 40s. Or at least it looked like that inside in the late 1940s.
(Information from Alice Horner)