Chad Ludeman is looking somewhat ruefully through the rain-flecked front windows of the 100K House. A pair of residences are going up across East Susquehanna Street in Philadelphia’s still-scrappy East Kensington neighborhood, where Chad, his wife, Courtney, and their development company, Postgreen Homes, are diligently developing a quartet of sustainable-housing projects—100K, Skinny, Passive, and 2 Point 5 Beta—all to be sold for less than $300,000.
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