if so where and how do they currently find housing?

I am currently an active duty attorney in the Navy, mostly focusing on criminal law.

Ask to speak with some of their current owners and current/former tenants.

The property currently listed for sale on their site shows a cashflow of approximately $144/mo but I feel like that number could easily be eaten up by Capital Expenditures.

The current heater is the original from 1950 with 1950 flue.  

If you have a lease that is currently in place, you have to keep the terms the same until it ends and then have them sign a new lease with the new terms (give them the proper notice required).

Currently I am house hacking as a mid-term landlord (list on Airbnb.. renting Jack and Jill upstairs in our home to traveling professionals) we are consistently booked and lots of inquiries.

You should only consider switching when your current software has a significant flaw or lacks features that force you to spend excessive time on workarounds.

From there, back calculate an offer price you would be comfortable moving forward with in this current market.

3 of the 4 units are currently rented out.