I am 28 years old and I just joined BiggerPockets this September, 2018.

Completely demo the old interior, nasty dry wall, and false walls.

That means your data is already old.

Where I'm located the housing stock is predominantly quads and smaller... and its almost all converted SFH that are 100+ years old to boot (translated = rotted sewer lines, knob & tube electric, lead paint, asbestos siding & pipe wrap)... all the things that say OPPORTUNITY... and I've been missing it for over a year!

I think the more important thing to keep in mind is that this is a small portion of the real world.

Punches to the face would be avoided in an ideal world, but you have to be willing to take a few if you want to succeed.

while it was under contract I talked to the old man who lived in front of it. 

We become like a third world country that is cash and carry.

They are old school and definitely not technology savvy, but their paperwork seemed thorough and organized.Maybe it should have been a warning signal when they handed over a wad of unmarked keys.

For example, the duplex I bought in January has brand new HVAC on both sides and 3 year old roof, and upgrades to interior 3-5 years ago.