"Modern" - 30 to 40 years old.

As I remember a combination of days on market at 30, 60, 90, etc they lower 10% and if your offer is in the negotiable range they will comeback with an offer at their lowest acceptable, found it to be @81% of asking price, so if offered at right time can hit one for 71% of asking almost every time.

There are some business/commercial banks who will lend you up to 80% but the terms will not be as favorable as 30 year fixed Fannie/Freddie money.It sounds like you have an opportunity to obtain up to  70% on the 2nd 4 unit.On primary residence there are opportunities to obtain up to 80% on a first loan and combined with a 2nd line of credit opportunities to obtain up to 90-100% of your home equity if you so choose. 

Wholesaling is very hard to do, it is completely possible but can only be ethically and legally accomplished if you combine it as a part of another strategy whereby you actually have the means to buy a house. 

Currently, I'm in the process of obtaining a HELOC, which combined with a cash on hand should net me around 100k to start.

Sounds like a winning combination. 

Combine that with a roommate or two and you're on your way.Good Luck....

You might find someone who likes radiators, but 95% of people want modern amenities.

to study combined with  online quizzes and tests.

In 1946, knob-and-tube was still possible, but not as common.fuse panel versus breaker panel;electrical system of insufficient capacity for modern, electronic living;Plumbing:galvanized supply and/or drain lines.