By Dan Adams | GLOBE CORRESPONDENT AUGUST 26, 2015

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The $5 million listing for a rundown strip mall on Broadway boasts of the Somerville property’s redevelopment potential because of its proximity to a planned Green Line station.

The Green Line is also a bragging point for the builders of a 30-unit condo building — some priced as high as $750,000 — on Washington Street near Union Square, its sales pitch concluding: “It’s not just a home, it’s an investment!”

Around the corner, a nervous first-time home buyer rationalized buying a condo just above his price range as a “responsible decision” because the coming Green Line would boost its value.

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