Virtually anything that identifies one product or service, and distinguishes them from the products or services of others can be a trademark or service.  This includes the configuration of retail stores.  Apple has registered the design and layout of their retail stores, owning Reg. No. 4,277,913 and 4,277,914:

Oro Gold owns Reg. No. 4,948,104 on the configuration of their cosmetics store:

Floyd’s 99 Holdings owns Reg. No. 3,467,850 on the configuration of a hair salon:

Forever 21 owns Reg. No. 3732928 on the configuration of it clothing stores:

Flight 001 Holdings owns Reg. No. 3453856 on the configuration of its travel store: