@Vinny Muli - it is VERY hard but not impossible to get an equity line of credit on a non owner occupied property. 

Several options you can explore to get the down payment capital: Solo401k; HELOC on personal residence or from equity of the SFR; Cash Value Life Insurance Policy; Business Credit; Private Lenders, to name a few.

So the seller cannot go get another loan for a car, house, apartment, etc. so it damages their credit by stretching them too thin.Am I missing something? 

Yes, you bought what seems like a good deal on paper, but in reality, you own an old apartment building in a neighborhood with poor security, possibly surrounded by long-vacant shops, streets piled with garbage, and a poorly managed community.

Ask for a discount for prepaying for an in house credit?

I consulted with a real estate lawyer a few times this year who said it's very hard to sue for negligence and they advised against taking legal action, especially since the property manager at least followed through on the eviction and repairs.I've now asked the property management company to apply a $4k credit for all the challenges I've had working with them.

referral=UZXgWmHappy to help review settings or share unused property assessment credits if needed!

There's a decent chance that if you have good credit and improve your DTI over the next year, you can put a Heloc on the property while it's still your primary to unlock some of that equity if needed.

For me, I am a little hesitant because I would be in a situation where I would be trying to secure traditional lending (which should be very feasible given credit scores & what $$ amount I am pre-approved up to from my banks), meaning that I assume I would be forced into using my first-time homebuyer loan incentives.

To avoid going through the same poor experience, keep reading.Even if someone gives you a referral here, do NOT make the mistake of assuming that the PMC will meet your expectations, just because they met the expectations of the referral source.In our experience, the #1 mistake owners make when selecting a Property Management Company (PMC) is ASSUMING instead of CONFIRMING.It's often a case of not doing enough research, as they don't know what they don't know!