Best Green Houses
Philadelphia Freedom: A townhouse prototype demonstrates that sustainability needn’t cost a premium
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Chad Ludeman doesn’t make false promises. Brian Phillips, AIA, LEED AP, first met Ludeman after lecturing about affordable housing—an obsession of his five-year-old Philadelphia-based firm Interface Studio Architects (ISA)—at a Habitat for Humanity conference in 2007. “He came up to me and said we were doing cool stuff and that he was getting ready to do his first development,” Phillips recalls. “He was a software engineer.”
Like many architects, Phillips fields tentative expressions of interest often, so he doesn’t pay them too much mind. Yet six months later, Ludeman phoned to discuss his new development company Postgreen and a piece of land in the Philadelphia neighborhood East Kensington. Soon the architect and client were creating a project…

