White Tower Hamburgers was a restaurant chain that was founded in 1926. There is only one left. Here are pictures of the old buildings. Here’s an article from RoadsideArchitecture.com.
Architects Paul Hirshorn and Steven Izenour wrote a book about the buildings, White Towers, that was originally published in 1979. It was reissued in 2007. I have a paperback copy of the first edition
White Towers Revisited was an exhibit at the University of Pennsylvania in 2015. I saw it and thought it was excellent. Here are two articles on the exhibit.
Penn exhibit revisits White Tower fast-food chain
Sad! 