National Car Rental in downtown San Diego, founded in 1947 by a coalition of 24 independent rental agents, operates from the consolidated Rental Car Center at 3355 Admiral Boland Way as a subsidiary of Enterprise Mobility, the largest car rental holding company in North America. The counter shares the four-level LEED Gold-certified facility with sister brand Alamo Rent A Car, both feeding into Enterprise Mobility's combined fleet of more than 1.2 million vehicles worldwide. National's Emerald Club — launched in 1987 as the car rental industry's first frequent-renter loyalty program — lets members bypass the counter entirely and select their own vehicle from the Emerald Aisle at SAN. Fleet turnover between rentals runs through the facility's 15 integrated wash bays and 72 fueling stations, a quick-turnaround infrastructure that parallels the mobile fleet-prep work detailers like SD Auto Style perform for off-airport lots across downtown San Diego. Multi-week corporate fleet deployments combining reservation, insurance, and GPS telematics under a single Enterprise Mobility master account represent the counter's most logistically complex booking category.