I put 60k in improvements to the infrastructure to get a commercial tenant in there.

This FHA 90 day flip rule certainly causes confusion.I am getting conflicting info of which date to go by as far as the acquisition date to use for this time measurement.  

It is an improvement to the propoerty, so it should be depreciated, over 27.5 years.  

Even if you sell it as-is having it cleaned out is going to improve your sales price. 

And any improvement on how much less you have to pay on your mortgage is an improvement.  

A book that teaches you how to analyze the population of your target demographic in your city (is there enough of your chose demographic in your city that rents), and help you think of ways to improve your property to target this demographic?

The property require a lot of TLC, if I put enough improvement and rent it out again, can I "decontrol" this rent control?

Thank you both : )Matt - For a foreigner it is very hard to choose an area, especially in a country that New York alone is bigger than my own country LOLIf for example I want to choose an area in my country, it will still be easier even if I'm not familiar with real estate and even if I didn't visit it all (I didn't see most of my country :) ), because I know the language, the people, the rules (!!)

I told him that it is the building rule and I want to enforce it.

The IRS allows you to buy real estate with your IRA, with some very specific rules for doing this.