Architect vs Designer vs Draftsman (NYC)

[Veronica Taylor]

Hello

Looking at a multi family that will be converted from a 2 unit to a 3 and in need of a full gut rehab in the Brooklyn, New York area. 

I’ll have general contractors bid for the project. In your experience should I hire an architect, designer or a draftsman. From what I understand only an architect can obtain an engineer stamp and it would be needed for such a project?

Any input or recommendations are appreciated, thanks.