John P. Quirk, the executive chairman of VIP Tires & Service, has listed his Falmouth mansion in Maine for sale at $7 million. The 4-bedroom estate boasts a waterfront view of Casco Bay and includes deeded access to a dock and beach. Quirk, a third-generation tire dealer, led VIP to become a prominent automotive service provider in northern New England. In Boston, historic properties like a 1920-built condominium at 20 Gloucester Street have recently sold for millions, showcasing the real estate market's high value per square foot.