Really making sure that you stay on top of that person (contractor, you, architect) on the ball by following up with the city to get that permits done in a timely fashion. 

House hacking will also give you some personal "property management" experience.

But if you have one person who wants high end and new all the time and another who is fine with status quo, it is going to lead to problems.

So building should repair my ceiling.so now none of them want to take responsibility of those. and I don’t have insurance.Do I have any other option beside taking upstair neighbore to the court?

Completely agree with Greg Scott's clear response, the signed lease is legally-binding.

Your personal example is exactly why I like it.As I was just my opinion, and not written by Ai

(I've written about the topic on the forums many times).I also have personal experience rehabbing properties with structural issues (unfortunately).I've bought and rehabbed properties in almost every condition imaginable, but I've never knowingly bought a property with significant structural issues--that's my one deal-breaker.

It's hard to give the best responses without diving into the specifics of your portfolio. 

Credit is so important in this business.I will be interested to see what others say in response to your question.  

This will allow you to keep your personal name of the articles of organization.