Construction of a new 48 unit, 4 story mixed-use apartment building and (2) buildings that include two-bedroom townhouses and flats. Apartment building spaces include one/two/three bedroom units, amenity space, retail warm dark shell, lobby, management office, compactor, washer/dryer loads. Flats/townhouses include dining room, kitchen, bedrooms, bathrooms, and support spaces. Engineering services include mechanical, plumbing, electrical, and fire protection system specifically passive house designs, gas fired high efficiency split systems, rooftop energy recovery system, exhaust air system, VRF split system heat pump, domestic water heating system, gas piping distribution system, domestic water system, lighting, lighting controls, exit/emergency lighting, gas fired emergency/stand-by generator, power distribution system, addressable fire alarm system, low voltage systems power fire protection system (performance specification), standpipes. Engineering Design for Energy Star and State of Connecticut Housing Financing Agency.