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/AVvXsEjj_7BcQYt-xjVgUB7zKOWOjlzhEsMhTXeOp9NTFe49Ryw99vdMOq7gSjr0eU1Lnq0ioWQKAmiF_YSmdF216l_Ok2sGByZdz8t9APGr9W3N8eyczewp8lzUKYLNKQCslen9v48VHQs3wyM/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