Retrofitting vacant and underutilized historic buildings to PHIUS standards leverages an existing building’s embodied carbon, which combined with low carbon and carbon storing materials, can transform our historic buildings into carbon sinks. With careful consideration, the Federal Historic Tax Credit program can provide an additional source of funding for these ambitious Passive House projects. Currently under construction, Moran Square is one of the first PHIUS Historic Tax Credit projects in the US. The site includes a historic firehouse, a vacant lot, and historic three-story building.