Operating inside the James R. Mills Building since 2002, A-Mart is a sole-proprietorship convenience store at the ground level of downtown San Diego's 12th & Imperial Transit Center in the East Village. The store's position directly above the convergence point for the Blue, Orange, Green, and Silver trolley lines generates foot traffic from the 30,000-plus weekday transit riders passing through the station, a visitor volume shared with East Village entertainment draws like Arcade Monsters San Diego. SNAP/EBT acceptance and a prepared-food counter with a dedicated seating area serve the Mills Building's 1,000-person weekday workforce of MTS and County of San Diego employees. Morning commuter traffic and the surrounding condo-tower residential base create a breakfast-hour rush that complements the sit-down morning menus at nearby Broken Yolk Cafe on Park Boulevard. The store stocks packaged snacks, cold beverages, tobacco products, and quick-service prepared meals calibrated to the two-to-five-minute dwell time of trolley transfer passengers.