An example would be a $100k house that rents for $2k/mo.

I'm trying to analyze my first property and not sure how to set it up to run the number using the calculator tools here. 2 of the units are successful Airbnb short term rentals, and the other two units are month to month rentals to existing tenants.

You will need a local attorney to close on a house.  

For those holding hope they will fall and save existing deals, don't hold your breath. 

I am going to guess that you have checked the comps for the neighborhood the house is in and you have found other houses for rent at the market rate?

Those already exist in mass.

Do you have any equity in you existing home (if you own it) so you can leverage a HELOC to use as an emergency fund?

Investment Info:

Other other investment.

I have a shop on my property that has a one bedroom apartment.

House Hacking that for $800/mo.

If any need for boots on the ground ever exists for you, I would be happy to assist or brainstorm.

However, there aren't any comps of new construction in the area beyond land sales on brand new neighborhoods, and existing sales of older 4 / 2.5s are in the high 200s.