The main issue is that to do the ADU you have to spend so much bringing other items up to code like electrical, plumbing, lighting (windows) and egress.

No one accountant is an expert in all areas in the tax code, so best to figure out what you want first in the world of real estate and then dive deeper there. 

A lot of times the different viewpoints lead to different questions to ask.In regards to your replies:1) I'm no legal expert, but it seems the sections of tax code you mentioned don't consider in-laws to be a personal relationship that would prohibit the transaction.

My question is can anyone point in the direction of someone who could represent me in this matter maybe a lawyer or attorney, or someone who knows the fire code and who can be clear and concise on what I need.

I have had inspectors look at rooms on renovations that were not permitted (we weren't even doing work in the rooms) and asked that certain changes to be made to bring the room up to code (it was minimal).

The FMR in that zip code for 3 BR units is $1,590.Thank you!

Hey @Mike Nelson, never assume anything about STR rules and regs.Here is the STR rules for Oak Park - https://codelibrary.amlegal.com/codes/oakparkil/latest/oakpa...I would call the city and make sure it is legal for a specific property.Now regarding the famous person angle, sure it can add value to the property or as a STR, but for STR use, I would think you would need it to be in original condition with a lot of the furniture and knick-knacks that were owned by the famous person along with a bunch of photos etc featuring the famous person.If you buy a place that has been totally redone but was owned by someone famous but has no features or things that were theirs, then I don't see it being a draw. 

As in zip code?

Some nosy people might even rat me out to the code-compliance folks.

Plumbing and electrical are up to code, but I am sure that the city will request other modifications.