A wholesaler is cooking up a new location at a vacant retail site on Long Island. Restaurant Depot is taking over 65,000 square feet at the Riverhead Plaza shopping center, 765 Old Country Road. It has signed a 15-year lease with landlord Philips International. The Riverhead space was previously occupied by Walmart, which abandoned it in 2014 to move 3 miles west to 1890 Old Country Road. It’s been vacant ever since. Nearly 47,000 square