The committees have never said they'll require a specific form of evidence to show that you've rented the place for at least a couple of nights.

You can also use online resources such as City Data to search demographics in the area. 

Every PM operates differently, and at the end of the day, there is tons of information you can navigate on your own in the beginning stages online, but surely there will be PM's that would be more than happy to assist you on journey. 

AirDNA only know whether a night is open or booked. 

He was a former professor and has online courses that are good to have.

I can't post the link here, you can dm me or search online. 

But damned if I can find anything online about landlords using it!

It is not very difficult or complicated to evaluate commercial real estate, there are plenty of good books available that can teach you how, textbooks, online courses, community college classes, even excellent youtube videos etc, and it is actually quite enjoyable in the process to learn.

The property was purchased in 2021 for 1.1 million, was appraised in the summer of 2024 for 2.2 million, and reports from online appraisal websites say it could currently be around 3 million.

I'm looking to do a cash out refi on a duplex I have, but I cannot find any reviews online or much of an online presence for them.