For individual properties, we've recently started using a QR code system for wi-fi and email capture to save on costs.

Since you're an individual, mainly whether or not the 4plex was built in the last 15 years.Assuming the tenants have occupied their units for over a year you'll want to give a 60 day notice.Alternative route?

They typically don’t go above 50% ltv and usually pay cash for the properties.The only people who would do this is private individuals with deep pockets.

In order to avoid wasting time on a bunch of individual showings with unqualified applicants, perhaps consider doing what I do and host “open house” style showing windows. 

I can see things moving forward in two ways: 1) These individuals and entities will work with us to return monies owed back to the Company or 2) we will need to go to litigation.

I would not invest in real estate with a retirement account.Its too much of a headache and likely not that much better as an investment alternative within a retirement account1) Real Estate provides tax benefits for individuals who own them.

IMO individual lease are a nightmare.2.

Quote from @Jaycee Greene: Are you wanting to own individual MHs?

Would love to network and build relationships with like minded individuals. 

Internal Revenue Service (IRS):- https://www.irs.gov/individuals/how-do-you-report-suspected-...5.