See Facebook group for more info “Why ICF Construction is Best for Real Estate Investors” These are slab homes with a frost wall, ICF has its place in many situations but this isn’t one of them, I do concrete for a living and have access to regular aluminum forms 

There's not necessarily seller financing calculators, just put in the numbers into a regular calculator.

While I am about to provide a 3 day notice to a tenant that I communicate with regularly and whom I've worked with for 2 years, is there anything I can or should do to fix this now or does it not matter?

I was thinking that the units would be full in the summer and that they would also do much better in the off season than a regular 7 bed house because in the off season there are many more people looking for smaller units and not entire families coming for vacation.  

As you move below C you get into really dicey neighborhoods, or deferred maintenance nightmares, or tenant classes that you might not want to have to deal with on a regular basis.  

There are high-end homes popping up on a regular basis and they are closing down the shore motels and run-down buildings in the area.   

There are gems out there regularly that are waiting to be found.

So the due diligence period (aka "option period", aka "feasibility period", aka "investigation period") is usually a lot longer than a typical option period to buy a regular SFR. 

If your basement regularly has water seepage, I wouldn't use LVP.

What is the advantage of an Umbrella policy over a regular landlord policy?