Give them a hard deadline to pay in full (30 days should be sufficient).

This feels sufficient to me, as I'm also pretty handy and self-manage, and if a bunch of simultaneous repairs were needed, I would like dig in and try to do some of them myself. 

One owner occupying one unit will be sufficient.

Purchase price of $1.2 mil, I have W-2 + rental income sufficient for the loan, and I'm hoping to do 20% down, but may be able to do 25% (I would prefer not to).

Zero  were tri's and quads mainly due to the self sufficiency rule for a primary residence.Regarding you question for analyzing, I have a comprehensive spreadsheet we build tailored towards House Hacking along with a youtube video tutorial how to use it.

I had a terrible experience with full service property managers, I sleep much better self-managing but there are certain things I'm just not willing to travel for.

With self sufficiency rules for 3 and 4 flats, those are going to be priced out.

Her retirement funds should be sufficient, but... inflation.

We just received a complaint from the tenant down the hall that the dog is howling, scratching on the door, and otherwise making too much noise for their baby to sleep.

I love BP, because when I started 6 years go, BP was my outlet for advice.Second-- NEVER give a reason for rejecting someone, a simple "Thank you for applying, we're currently reviewing applications" is sufficient.. and once you find someone else, you say "Unfortunately, we found another applicant to be a better fit."