HAGERSTOWN, MD. — The Oekos Group has purchased the 110,000-square-foot Stone House Square shopping center from its developer, Faison, for an undisclosed price. The newly completed center, located at the intersection of Leitersburg Pike and Cortland Drive in Hagerstown, is anchored by Weis Supermarkets and Lowe’s Home Improvement Warehouse. Stone House is 90 percent occupied by Chevy Chase Bank, Starbucks Coffee, Greene Turtle and Friendly’s, among others. Mike Gorsage and Kate Howarth of Baltimore-based H&R Retail brokered the sale.