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/AVvXsEiJ5_-DV_HAREctZKuBGHIH7vrTwKu2pV4UXcvhRzNcmed3hz7y1Kgtwj2LytuLlg_Gwt7WsOWPYCcroYRLG_R-4ve80Gp-Dx2H5VLhaDSQHS2hAdImc5LVLWCpHD88eY_w2whlNk-oMuc/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