BluPath principals Laura Blau and Paul Thompson renovated their own 1870s era historic 4-unit multi-family rowhome in the Rittenhouse Square neighborhood. Unit A, the owner's apartment, is a gut-rehab custom designed bi-level 3-bedroom, 3-bath apartment, designed to the EnerPHit Passive House standard. The building also houses BluPath offices. The building utilizes mini-split HVAC systems, water-efficient plumbing fixtures, energy recovery ventilators, super-insulated, triple-pane windows, fire sprinklers and fire alarm system. The 3-rental units are designed to EnerPHit (Passive House) Step-by-Step program for super energy efficiency, comfortable beauty and healthy luxury.