STANDISH, MAINE — Marcus & Millichap has negotiated the $6.4 million sale of Colonial Marketplace, a retail center in Standish. Located at 111 Ossipee Trail, the property is approximately 17 miles west of Portland. Preet Sabharwal, Zachary Weiss and Richard Dorfman of Marcus & Millichap represented the seller, a private investor, in the transaction. The buyer was undisclosed. Hannaford Supermarket has anchored the retail center for more than 25 years.