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/AVvXsEjFVHZW1NfqfOvtrYmXwz5B68r-dzbSeiYAWsq0xrxfZ-_oq_8MtQHk04DXm4p5APvSpkpUqB9tyO_2GKULNkuPfSlqytFiX0D1xJNQPDtgrVkmIVD3_J1bdKo_9S3fi10D3gB7bX0y2wg/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