The Nethercutt Museum has a section that is a replication of an early car dealership (like the photos from Shorpy)

For the Shorpy photos of dealerships, check out an interior https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgagq5dbCgpb2JBNe8t0WXXMzxSSNtgypaF2JAlGf42rVSN95Kp3-GqG2nOgIg3geEXz6oSssYb31VeS5CXRLVlQxu5ydJ8ylVVhkU7X00c_94ffq6UaWkmks7SjMp1R8uSREohYhJ91EQ/s1600-h/cars8.jpg or two in this post: http://justacarguy.blogspot.com/2008/11/automobiles-of-20s-and-before-from.html or an exterior: http://justacarguy.blogspot.com/2010/03/impressive-car-dealershp-architecture.html