Print Online shopping giant Amazon plans to open a distribution center with about 500 employees in Oceanside’s Ocean Ranch Corporate Center, an official said Monday. The 142,746-square-foot, single-story, concrete tilt-up building on Ocean Ranch Boulevard will have 15 truck terminals and parking for 230 employee vehicles and 703 fleet vehicles. It will cover two vacant industrial pads totaling 28 acres near an existing FedEx warehouse and the U.S. postal facility on Avenida del Oro. The Amazon distribution center will provide “last-mile transit” for orders that are packaged elsewhere from inventory stored at one of the company’s “fulfillment centers,” said Ryan Childs, a representative of the property owner LPC West.