HMAP Studio
The studio at 204 Erie Street is a new building of 1,250 sf built in 2004, matching the footprint and profile of a dilapidated carriage house (1857) set in the back yard of a residential street. It was designed as an architectural studio with four workstations, support spaces including a modelling shop and a common workspace on the ground floor; and a meeting room and library on the upper floor.
Accessory Dwelling Unit
In 2025 the 204 Erie Street carriage house was permitted under CambridgeAccessory Dwelling Unit regulations, to be converted to a 1-bedroom apartment. On the ground floor the office space was made into kitchen / dining / living space with a laundry and storage at the back. On the upper floor, what had been an office library is now a bedroom with a full renovated bathroom.

