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/AVvXsEhyw_h_6tOG3MVsSzXZZhiV4AIO0rOD_YcNjHE6RsTKU7Bbf0YN7Xt_mJiCp8cb9gpDsQAbEYk02Dq4xuhTdsPhGnJgmwx0nv5yQL5FHpQ8Qla7obOA_Xv0G6ChyphenhyphenLmY7YuEd9OO1ASOL9Q/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