They were installed to code and are oversized for the square footage.

You can target specific zip codes, types of owners, what cars they drive, and SO much more.

I understand that the USA is different, it is more strict, but there is always a way to do things.I also invite you to better investigate what international hotel management companies are.

The people who live there typically sign strict lifestyle contracts that state they have to leave immediately if they don't follow it.

What zip codes / subdivision names should I buy?

They do not provide advice nor keep up with every development in every section of the tax code.

For a situation of moving from one househack to another, there really are some strict rules for vacating residence but you can't use it as income even if 75%*rent > PITI. 

Per the Chicago building code, you'll likely need a second stair.

If its a total gut, that changes things...but if it's bought right...Rehabbing will likely be your best bet. new builds set the price premium in every zip code I've ever studied. in addition new builds don't take 9 months. we just built a house in 60 days. we wait till permits are approved and shovel ready, investors buy land cash, entitle, contracts, negotiate with financing, place financing when we are ready and break ground. but we build the same over and over and don't go outside our Floorplans