Unless you're financially prepared to deal with these issues and accept that 'once you know, you must always disclose' defects, I would move on to finding what is truly a good deal - as a good deal is only as good as its bones.  

Review their online financials/annual statements.

The second habit that has helped me track my finances is that I’ve created a personal spreadsheet that I fill out at least once a month that tracks certain financial metrics I’m interested in comparing.

It's really hard to give financial advice without having a full idea of what you're trying to do (fix and flip, buy and hold etc). 

I don't have the time or the financial means at the moment for that.

It seems like your ROI is basically the same in each option, but you are taking on a much bigger project to convert a single family to a four-family.So basic calculations, since we don't have a full financial picture, i.e. what does financing of each look like?  

Long story short, I am in a bad financial condition as of recently.

If you need financial help, ask under the "Finance, Tax, and Legal" forum.

You can sell on financial method because there is such short demand there is all but no comp's to use for comp method, and if selling as turn-key, yup, financial method will be your friend for sure. 

Prices go down, causing financial pain for the gentry.