IF it is a real problem, then yes, fix it.I would build a fir-in wall out of 2x2s and insulate it heavily (Rockwool comes to mind https://www.rockwool.com/north-america/) There is also drywall that is made for this.

NO for sure IF you are doing your first deal then 75 25 is totally appropriate in my mind. 

I certainly don't want to get into the business of being a "bottom feeder" that takes advantage of people, but if there is space in the industry for someone to help people in your situation while making a fair profit, I wouldn't mind learning more and getting involved.If interested, message me.

Keep in mind that some of these C class areas in Columbus your pro forma will look better but you should be running a higher expense ratio. 

@Jay FayzIt's possible to use an FHA loan with a 5% down payment, but keep in mind that the loan is intended for primary residences, and you'll need to live in the property for at least a year.

Keep in mind these still aren’t huge numbers by historical standards.Single-family home stats for November.

RISKSPrivate Letter Rulings There are three (3) Private Letter Rulings (“PLRs”) that address this 1031 Exchange structure, which are as follows: Private Letter Ruling Number 2014-08019Private Letter Ruling Number 2003-29021Private Letter Ruling Number 2002-51008PLRs can only be relied upon by the individual taxpayers that requested the PLRs.

If you don't mind, post a link to your place.  

Unfortunately, I don't have one in my mind.

Bear in mind that the fiscal treatment of the two options in Mexico is different (withholding tax on the gross income with the fideicomiso vs cost deductions with the corporation).