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?

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.

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. 

On the lending side, we see a lot of private individuals that try to lend out of their IRA just because the borrower is a "good guy".

While this approach ensures more reliable tenants, it also limits the pool of prospective renters, making it challenging for individuals with less conventional financial profiles to secure housing.Given these challenges, I have decided to exit the Ontario rental market.

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

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

You will need an LLC resolution (indicates that individual members can sign on behalf of the LLC.)

I don't have individual accounts per property or per door.