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The Globe’s John Hilliard explores the proposal for park decks over the Mass Turnpike in West Newton and Newtonville that’s part of the Hello Washington Street visioning process.

Under proposed zoning for the area, developers would be able to build commercial buildings of up to 10 stories by special permit, but would also have to contribute to a fund to help support construction of the park decks, as well as improvements to the city’s commuter rail stations, [City Councillor Susan Albright] said.