Retail news out of Gowanus is scarce, but in something of a breakthrough, 40,000 square feet have been leased at Brodsky’s and Avery Hall’s 499 President. The new tenants are Union Market, Corto, and Spear Physical Therapy, joining Paulie Gee’s and Royal Palms Shuffleboard. 499 President Street Gowanus, Brooklyn With 10,000 square feet, Union Market…