Brookline became independent from Boston in 1705; its name derived from the two brooks that separated the towns Brighton and Roxbury (now both part of Boston). In 1806 transportation routes were developed, making Brookline readily accessible to Boston. The Boston-Worcester Turnpike (now Route 9) replaced the old Sherburne Road (Walnut and Heath Street) as the Town's major highway and the main road west from Boston. Mill Dam Road was opened in 1821, extending Beacon Street into Brookline. This consummated Brookline’s transition to the desirable commuter suburb that it is today.

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