Very fresh to investing but I am in the process of renting out my condo to house hack a property that I should not have bought.

For example, installing vinyl plank flooring. 

For example Glen E.

That's not good for either of you so get more than one estimate or an example of his working on something so you can get a realistic ballpark figure.And write a contract for exactly what, where, when, how, and by whom, no matter who ends up doing the work.

For example, if you look at recession statistics, generally office suffered higher vacancies and higher rental drops than multi family.

Ultimate challenge being coming up with a large down payment.For this example, the owner owes 100k and the property is worth 425k.

The word missing from each of your examples is eventually.Sensible businesses do not jump to the threat of temination  as a first, primary or only option.

It seems like a lot below ARV but lets say I am flipping the place (I am a buy and hold investor but for this example we will use a flipper) I need to finance the deal and repair (cost of money: HML loans are not cheap), I need to work to do the rehab even when using contractors (manage the contractors, etc.), I need to sell the property (approaches 10% to sell a property), and I take on all the risk of unexpected events. 

I thought NQU could only occur before the property was a primary residence.For example.

For example, if I take a loan from 10 different friends and family members, all secured by the property that I'm buying, is this something the title company would accept at closing?