A Boston Landmark is a designation by the Boston Landmarks Commission for historic buildings and sites throughout the city of Boston based on the grounds that it has historical, social, cultural, architectural or aesthetic significance to New England or the United States. While National Landmark or National Register status can provide tax incentives for the owner of an income-producing property, local landmark status provides more control over modifications to a designated historic structure or place.

Commonwealth Avenue is a major street in the cities of Boston and Newton, Massachusetts. It begins at the western edge of the Boston Public Garden, and continues west through the neighborhoods of the Back Bay, Kenmore Square, Boston University, Allston, Brighton and Chestnut Hill. It continues as part of Route 30 through Newton until it crosses the Charles River at the border of the town of Weston.