This falls under reasonable modifications of the FHA/ADA.

Creating a good reputation is vital before I work with investors...WOM travels fast in that community I believe.

If any of the improvements and/or modifications were not permitted you may have another hoop to jump through.

Ask if they've done any deals with the buyer, whether the vitals of the deal meet their requirements (and how much cash the buyer would have to contribute).  

On its website, Wealth Educators claimed it was “America’s Leading Home Preservation Legal Services,” saying that they “. . . act on behalf of homeowners to work with your lender and avoid the lengthy and costly process of foreclosure and the stressful act of eviction that follows…”.Unfortunately, according to the complaint, while Wealth Educators told many consumers they could get them a loan modification, typically through a government-sponsored program, and even quoted a specific amount consumers’ mortgage payments would be reduced, the company often did not provide the promised relief services.

Another example of this type of setting is failed forbearance to modifications or the "Trial Mod" as they are often called.  

It's vital to know the ins and outs of owner/tenant regulations BEFORE you buy in a given area, and always do a very thorough credit and character check of every prospective tenant.

And should I          wait until the loan modification is complete before going to closing so as not to trigger          the DOSC.

Where are you looking to invest.This website will prove to be vital in your education. 

By the way, I am pretty small time compared to many on BP, but so far, all of my properties are conventional loans and I have a very small W2 income, but it has been vital to my growth.