And with those factors I'm navigating the dichotomy.To get specific, the SECURE act also adds to that unease as it forces all that money to be withdrawn in a 10 year window.

If he fails to pay it, take him to court.It's going to be difficult for you to force him to repair it if he doesn't want to.

The impact will be blunted by something most aren't aware of: Even as interest rates fell in 2020, causing the refi boom, lenders on average were significantly INCREASING their profit margins.

The property class is 2-11 which indicates 2 -6 unit apartment buildings.I'm looking to use an FHA loan so the zoning will impact how much money I am able to borrow. 

Your $100k is your 25% down payment and hold back some initial reserves and closing costs...find the market that meets your criteria for a C-class value-add MF property, build your team (starting with an agent), and pull the trigger...long-term buy and hold...drop all profits back into renovating units and forcing rents higher...take advantage of your equity in 4-5 years and buy another one.

So that may force me to adapt my model. 

If your seller second balloons, which most do, I highly recommend that the balloon lasts at least 5 years or it will impact the bank's terms to you. 

However, if someone was to alert them they could choose to do an inspection and actually force you to remove people until you get under that limit.

It's actually better to invest out of state in my opinion so you're forced to outsource and delegate your real estate functions to others which will allow you to scale quicker.  

The pressure on a forced air furnace is not likely enough to cause any issues I would imagine.