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/AVvXsEhiFopDxm48kA54TvU-4JIt0bR3-reXNe1F7G2e4DVyO8_FCNG1oSYLCv6Hg7K4z2cVS1zyE-I6e6Gvejtf-NI7dDYXY1ujVk6-w63E71uZLGBhps89VgGktYNAtyYPCUgU1lAsLTcNTgQ/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