Envelope.  Continuous rigid foam on the exterior is taped and paired with spray foam in the cavities to yield a super-insulted and airtight envelope. 

Systems.  The office space is served by a natural gas boiler (hydro-air) coupled with a split cooling system. The residential spaces are both served with ductless mini-split air-source heat pumps which provide heating and cooling. Ventilation is provided by dedicated outdoor air systems by way of energy and heat recovery ventilators. There is an energy recovery ventilator that provides balanced ventilation for the office and heat recovery ventilators for the residential apartments.  Two heat pump hot water heaters provide domestic hot water for the residential units. 

Renewables.  On the roof an 11kW solar electric system offsets all the building electricity consumption annually. 

Certification.  The building is LEED Gold certified by the US Green Building Council.