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/AVvXsEiPU1vX3kiV7wS-WppHdu18a7o_HDP8DY80bavURMRXd3zrpNGLG0S9bg1PD7VXItsWQkoeznbx-jO_5KeFa9ww9jttGLWBsy3a5P-yd-hy0vf_UrJuD-Q9KHkI3GeV19k8F-9gzprNaEU/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