I remember radio ads for Butwinick's from my childhood. As you can imagine, it's a name that a tween would remember. I'm surprised I've not found more about the store's history on the internet, but Writing On The Wall says it was in operation from the '30s to the '90s. I'm guessing that its closure was just before everything started getting documented digitally on the web. Apparently a scion of the family now owns a mattress store.
From the Historical Society's photo archives we learn that Butwinick's store had a fire in 1949, which led to a big sale that drew a big crowd. And here's another shot from Flickr.