Understanding what you are buying and in what neighborhood is important anywhere you buy, Dayton is no different. 

The reason I don't purchase new construction is that there is no room for value add, and from a pure cashflow perspective, it's harder to make the numbers work.That's why I started looking more towards multifamily.

Just to throw some numbers out there,  If it costs about 45K to rehab and rental income should be about $24000 a year.

Therefore, there is no frost depth protection (heaving and thawing, etc.).I am unfamiliar with the construction approach. 

Basically its no different than applying for any other mortgage, the lender wants to underwrite the loan to confirm your ability to repay.

No experience with that one in particular but I can tell you that you are on the right track. 

While I’m no fan of realtors, and think they are often overpaid and under qualified, the idea about not being tied down is one of the dumbest compliant’s, in literally every other line of work, you get tied down, go hire a lawyer, you pay them by the hours, go hire a doctor you pay them by the hour, and you are not being tied technically, you could agree to pay two agents out of pocket, but of course no one does this for the same reason no one pays two lawyers.  

This is assuming the value of the property makes sense to do cost segregation. 

I have tried to find this info online with no success.

I have no idea.