Question on how to optimize 2-family multi-family house with basement and attic

[Bianca White]

I own a house in Queens that has a basement, two apartment units, and an attic. Currently, I am in an eviction process with the tenant who lives on the first floor. The basement, second unit, and attic are empty. 

I'm wanting to renovate the house. I was wondering if I would be able to somehow convert the basement and the attic into legal apartments and whether or not it would be a good investment. 

If not, I was wondering if I myself as the landlord could live in the attic. I'm not sure if that is legal during a holdover process or even in general.