The Design District around NE 40th Street combines showrooms, restaurants and residential buildings. Mechanical rooms are small and shared, so isolating one unit without disturbing a neighbour is part of the work.
Mezzanine plant areas and back-of-house rooms serve several tenants at once, so isolating a single unit without interrupting a neighbouring business is part of the planning. Units installed above retail space also need their pans and drains confirmed, because a leak there reaches stock and finishes rather than concrete.