Preston Gateway Corporate Park Preston Gateway is a 1.2 million square foot speculative development containing four industrial buildings ranging in size from 176,000 square feet to 314,000 square feet.  Tenants include General Services Administration (144,386 square feet); Elite Spice, Inc. (169,464); and Owens and Minor, Inc. (223,871 square feet).  In 2006, Preston sold its interest…