Third time's the charm?

Intrepid surveyor Mike Finkbeiner explores 105 Parsonage Road (representative) 

105 Parsonage Road, that swampy building lot that's been on the market for years and now asking $1.345 million, reports a contract. It also had contingent contracts in 2014 and 2015 and nothing came of them, but perhaps this time someone's figured out how to build a home there. 

How to and, more elusively, why.