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/AVvXsEhy0RjMk455aYgLjau_16lWI_zoknUz98OzTt0_fyi9eh7VS5OhfR7lwlJ5wZEe8PjwRXeBt1Ghs8pUj_eObdQ4KKtKc5Rg6v1hT54R6oJC-HN81wOaFoXMQMmJeg536U2bBsDF_icAtsY/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