Here's the full postcard of Western Publishing's Racine building on Mound Avenue, Racine, WI.
EDIT: The comic books were printed at the Poughkeepsie, NY printing plant. Not in Racine. Thanks to Bill Peckmann and Mike Barrier for sharing their knowledge.
And here's what the place looks like today.
There's a "For Lease" sign outside so if you're thinking about starting up a publishing company this is the place to go for. :)
For an illustrated history about Western Printing and Litho go check out THIS site.