Project examples and strategies: 1. 11 E Lenox St. in Roxbury, MA is a 7 story apartment tower built of Cross Laminated Timber post and beam structure and floor slabs with FRT wood-frame exterior walls. 2. 327 N. Negley Avenue is a 45 unit Passive House retrofit of a historic mid-century Hebrew School in Pittsburgh, PA. The decision was made to save the existing structure rather than demolish it and build new. Two additional floors are being added to the existing two-story building. The combination of retrofit and new construction offers a panoply of challenges in terms of control layer continuity and thermal bridging. The Hebrew School is itself and addition to a 1923 Synagogue which will be renovated during a second phase into a community owned and operated space including renovated space for worship, community events, performance and fine arts as well as supporting functions for an on-site regenerative farm. 3. 1600 W North Ave. is a combination of Passive House retrofit and reconstruction of 7 row homes in Baltimore, MD. It is a design collaboration of Onion Flats Architects, Staengl Engineering and Passive to Positive. At the time of this writing, numerous decisions about assemblies and materials are under evaluation. This investigation includes the embodied carbon and toxicity of 2x8 walls with no continuous insulation versus 2x6 walls with reclaimed poly-iso. 4. Willow Street is an 18 unit new-construction, mixed-income housing project. Reclaimed foam insulation will be used for the foundation and small sections of roof structure.