R6 with C2 overlay - two family house

[Michael M.]

Does a C2 overlay apply to a current 2 family dwelling or does it only apply to what can be built if a current building is knocked down?  

Could I put a retail business in my basement or first floor due to the C2 overlay?

[Jared W Smith]

Disclaimer: I am an architect, but I am not YOUR architect. I am not giving professional advice only general information. Contact a local architect/engineer for a detailed consultation specific to your project/locale.

Based on your description @Michael M., an architect would confirm the zoning first. Then if feasbile, they would basically design your retail space adhering and ensuring compliance with applicable codes with the filing (as an Alteration Type 1) which will amend the Certificate of Occupancy to add the retail into the lower floor. This is more than a typical tenant fit-out but not a very difficult task as long as the space is as you say and can meet the current codes (and ADA depending on business type). Also a big proponent to the feasibility is the commercial FAR. This will affect the size allowed for the commercial space.