If this makes no sense, that's because the building on the left was never the Glass House. It was the home office for the Glass House chain.
Which we will meet later, in an unexpected manifestation. I don't know the history of the chain, but I wouldn't be surprised if it was a mid-30s creation. The sign, the "glass block"idea as a symbol of modern comfort and convenience.
I'll bet the folks on the right just loved living next door to the place. .