If ANY personal items of the resident are left behind,  either a signed declaration from former resident that they have moved out and release any claim all remaining items - enumerate any large or potentially valuable items - (get it notarized or ensure signed with witnesses present)  or preferably,  ensure property is completely empty, interior and exterior,  of resident belongings.    

If you overpay for the property by $30k-$40k you'll likely never recoup that loss.To ensure you don't make a mistake on the property itself always get a home inspection and an appraisal.

@Samuel MedinaIn such a competitive environment, you may find it easier and more efficient to close on one new asset rather than four separate acquisitions.

Better to have the property vacated quickly so that you can begin an efficient turnover. 

The home had a conventional offer submitted the day we saw it and my realtor, convinced this was the best home on the market for the purposes of getting the FHA loan approved, proposed a strategy that involved an above-asking offer to ensure we had an accepted offer.

As I prepare to retire from the military within the next five years, I’m looking to find something that will ensure a smooth transition.

Of course these numbers are examples, ensure to plug in your own numbers.To simplify investing, having limits of what you will accept and sticking to them is key. 

That ensures that the IRS will get some taxation benefit from the sale. 

If you give them a $75 stick vac, it's you who will be left with the absolutely filthy and horrible carpets to deal with, even though they had, in fact, vacuumed regularly.3) I've already figured out efficiency issues and made some things a lot simpler. 

We are likely to hire a real estate attorney to ensure that our interests are covered as thoroughly as possible so my concerns are limited to negotiating based on a single realtor in the transaction.