Windows would be my next check-point (less than R1) and then wall insulation: I would not be surprised if they have no insulation inside, but you can do blow-in, which only requires a small hole.A home looses heat in two ways: heat conduction (which you can slow down with insulation) and drafts, which in old houses is usually the biggest culprit.

The building was vacant and completely rundown with the windows all smashed out by the end of the lawsuit.

Window AC units can indeed be treated as tangible personal property with a 5-yr life and be bonus-depreciated or deducted under Section 179. 

(they get a cut of the GP fees for fundraising)Goodegg Investments – This Is Is How We Make Money Through Real Estate Syndications (youtube.com)what's most annoying is the slide at 50sec, she has on the left the GP which "does all the work and takes on HIGH risk, while on the right the LP who does no work and bears low RISK".

But I was thinking only about the exterior, it did not even dawn on me that your furniture ignites from the radiant heat through the windows!

I don't think you are going to be able to get insurance for two separate living units in a single-family when they are both illegal and likely do not have the correct egress windows (basement) for fire safety which could subject you to huge liability if something happens to either party.

So they have to do all their inspections in that window?

The tenant could say "my window doesn't lock" instead of calling or troubleshoot or sending an in house tech they will send an expensive GC who charges $200 an hour to check it out and then charge you for their time. 

I have yet to complete a walk-through of the property and see what renovations may be needed (potential for HVAC and interior, but from my understanding the roof and windows were replaced within the last 7-8 years).

Within the next 24 months the market will begin to slide and deals will be more prevalent.