Is it directly below a bathroom?

This residence features 3 bedrooms and 3.5 bathrooms, encompassing approximately 1,700 square feet of living space.

I will also be doing all the cosmetic things you can think of: paint, flooring, bathroom reno, kitchen reno, so I am open to carpenter or design suggestions.  

The bathrooms are very narrow so I was wondering if there's a requirement to have a bathtub.

New kitchen and bathroom.

There is roughly $20,000 left in rehab including windows, floors, a new kitchen and bathroom. 

It may be best to partner with someone that has done one before or somehow is a local expert on lot splits.If you can add a bathroom into existing space on high cost property it can add a lot of value.  

As someone who did something very similar to this for the last 2 years - rented out my 2nd private bedroom and bathroom in my apartment (rental) furnished to traveling professionals and medical students - I think it's a great idea! 

This single-family residence spans approximately 4,250 square feet and features 5 bedrooms and 5 bathrooms.

Additionally, I would like to attempt to do the process Owner/Builder with subcontracting work out as well as doing some of the work I'm comfortable with (I have some experience with bathroom & kitchen remodeling an am not new to the construction industry).