AVON, IND. — Summit Realty Group has brokered the sale of a 20,912-square-foot office building located at 5250 E. US Highway 36 within Prestwick Point Office Park in Avon. Co-Alliance LLP has purchased the multi-tenant, two-story building from Avon West Office Tower LLC for an undisclosed amount. Co-Alliance is relocating its headquarters from Danville, Ind., to the new location. John Demaree, Tim Norton and Jeff Merritt of Summit Realty Group represented the seller in the transaction.