Tape measure, then a pen, paper and architects scale.

Nothing too unusual, but today I read on the web site of a local prominent property management company: Dispelling the myth of positive cash flowChapel Hill real estate is renowned for its consistent, stable, and relatively generous appreciation.

Good day- first verify your zoning situation You can do this here on Chicago website https://gisapps.cityofchicago.org/ZoningMapWeb/terms.htmlNext, get yourself an architect who is familiar working in Chicago area(if you need recommendations feel free to message me privately) make sure you bring a plot of survey when you meet up with the architect and have him draft a preliminary stage, this will get you a better idea of construction pricing.

I work as an architect in Boston and currently spend most of my spare time with my wife and two kids.

Then speak to an architect and figure out if you can expand or change kitchens to bedrooms to increase the value without needing a variance.From there you just need plans and the proper permits.

Permits need plans so you need to include the architect cost which is about 10% to 15% of the cost of the project. 

@Greg ResslerI would recommend talking to an architect who designs row homes in Philadelphia.  

Then if the numbers look good and you are prequalified, get the architect to draw the plans and you are on your way.

I want to take the half bath to a full bath.Does anyone have a recommendation to an Architect to draw up plans for the half bath to full bath remodel? 

Some of the larger brokerages in town I have spoken with have in an house development firm, PM firms for appartments, facility management services, architects.