CAMBRIDGE It s a massive mansion complete with a private airport, library, gym, seven bedrooms and 10 bathrooms – and the Cambridge property could be yours for a mere $15 million. It s just one of those properties that you marvel at, said realtor Sam McDadi, who listed the property. It checks off all of the boxes. Like there s nothing that this house doesn t have that someone wouldn t want. The nearly 9,000 square foot mansion is located on a 120-acre estate on Wellington Road 34 in Cambridge. McDadi says the biggest selling point is the hangar and runway on site, ideal for someone who owns a private plane.