These were at the Hollywood USO, the 1531 N. Cahuenga location- featured in the February 12, 1945 Life magazine. It says they covered square feet and served as not only decoration but a sort of "fun map" of the Hollywood/LA/Beaches area for the visiting servicemembers. Like the Hollywood Canteen murals, they were done by studio artists. It also mentions the Hollywood Chamber of Commerce was planning to make color postcards of them for souvenirs; I've never seen one. Another unicorn.
The back wall is brick, and those seats look like old train station waiting room benches.
Details
same picture as up top, a little better, from
here