In my case, I renewed a lease because they are great tenants one one floor in a 3 familiar.  

I would just excavate a few 2'x2'x2' (or larger if possible) spot footings, w rebar and Simpson hardware,under the house (you will want to take up the floor to make this easier to do).

I am beachfront (all 4 listings are in the same building, same floor, next door to each other), some are listed as beachfront, others aren't.  

Renting out a room is a great way to get started, and I wouldn't get too settled into the "going rate" use that almost as a floor. 

Keep the wood (or sheetrock if you choose) an inch or two off the floor to not wick water.

With foundation issues, one could have plumbing, drywall, flooring and even roof issues and alot more.

Great to meet you.We source from four primary suppliers: Lowe's, Home Depot, Floor & Decor, and Amazon.

So many of the builds I've visited, some multiple times, seem to be frozen in time: the homes are dried-in (roof paper, windows and doors), tiled floors, drywall installed, and then a dead-stop.

Quote from @Ricardo Polanco: Good evening everyone, I am evaluating the possibility of buying a multifamily property in Scranton, at this moment it has 2 apartments that only need cosmetic repairs and it has a big 2nd floor unit that needs a full repair.

I think you are looking at the wrong places, insulating the floor wouldn't change much.