The 17 Hartwell Avenue project in Lexington, MA involves the complete redevelopment of a single-story structure into a large-scale, mixed-use complex with residential, parking, and retail components. The primary construction scope includes a 347,000 SF, five-story wood-framed residential building built on a slab-on-grade foundation. The structure will house 312 units and is being constructed to meet Passive House standards, requiring meticulous attention to air sealing, insulation, and thermal envelope detailing.

Adjacent to the residential building is a 136,000 SF precast concrete parking garage designed to accommodate 364 vehicles. Sitework includes deep utility infrastructure, foundation preparation, and coordination of multiple building systems to meet high energy-efficiency and sustainability benchmarks. A 2,200 SF single-story retail building rounds out the program, offering ground-level activation and amenity space. The project demands complex logistics, sequencing, and quality control, particularly due to its scale and Passive House performance requirements.