There are no specific "minimum requirements," aside from "don't commit fraud" and a human BS test.

Hiding your installment sale with your next mortgage lender is mortgage fraud, that will show up in your tax returns later on and mortgages are audited after you have made them. 

A spreadsheet doesn't offer the ability to see who is making or editing entries so it's high risk for fraud and computing payroll taxes is a freaking nightmare. 

Some points about me and this property:- it consists of four 1-bedroom apartments - rented to young professionals- this is B property in a B neighborhood - current rents are $2300 ($550x3 and one $650 - the $650 is the newest tenant and the apartments are identical - so it sounds like the rents can be increased in the other 3 upon lease expiration)- it's listed at $139,900 and has been on the market for about 3 months- my calculation on this property is based on full asking price and current rents- The COC ROI is misleading based on the way I did the inputs -- the only cash out of pocket will be closing costs which I've been quoted to be about $7000  out of pocket. 

There are few ways around this, including a job transfer of more than 50 or 100 miles (I can't remember exactly).You say you want to live in one side, it doesn't sound like you have any sneaky plans, but I wanted to share that it is mortgage fraud, which is a felony, if you say you're going to owner occupy but then don't.

I plan to hold for at least 5 years.This is an early-1900s home with three identical 2 Bed/1 Bath units.

If the assessment was approved by the previous owner, and not disclosed, this is fraud (but I'm not a lawyer).  

You need to contact a real estate attorney who performs litigation and not just a contract and "book" Attorney.They will have private investigators who will track down and investigate the property management and interview the tenants.You may have a bit more problems than you know about,yet.This won't be cheap but you have got to protect your property and investments from fraud and abuse.

Isn't there something in those online programs that require people to verify their own identity?

That is fraud.