IMO individual lease are a nightmare.2.

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?

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. 

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

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.

I know that earnest money deposit is given as an indication of being serious but I just feel that $50k is a bit outrageous.

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

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.

It's important to understand the difference, and I'd recommend sticking with the REIT with depreciation advantages.The Tax Cut and Jobs Act (TCJA) includes a 199A deduction and applies to certain income from pass-through entities (including REIT dividends) and allows individuals to take the 20% deduction against REIT dividend distributions that yields an effective tax rate of 29.6% or 37% (80% for upper bracket filers).

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