I know was looking in a defined neighborhood and found an agent to aide in the search.

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.

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?

Hello I wanted to see if anyone knew how to get apartment complex unit numbers so I can send out mailers to these individuals renting there.Thank you in advance would be great great help ! 

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 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.

This is one of the reasons I have felt my investments there are safe: there is so much money there from both domestic and international investors, individual and institutional, that Tulum won't just go away. 

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

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

I really do appreciate all of the comments folks have made and it’s clear that they have systems in place and I hope that knowledge will aid me in my endeavor.