Contacts Needed for basement build out/ separating utilities

[LaJoi Royston]

Hello BP Folks!

I recently purchased my first property, a 2 unit building on Chicago's south side.

The building has 2 units, with the 1st floor duplexed down to a full finished basement.

The building was owned by a family so the gas was never separated.

Ideally I'd like to separate all utilities and build out the basement to be a stand alone unit so that I have 3 units instead of 2. Any recommendations for contractors would be greatly appreciated.