You can read more here, including a multifamily zoning proposal to prevent existing single-family homes from being demolished to make way for a larger, more expensive single-family homes.

The problem with buy and hold immediately is that eventually your debt to income ratio will prevent you to continue with your portfolio.

However, I'm more concerned about preventing this sort of thing in the future. 

The 41% debt to income ratio will still be in effect from what I understand which will prevent service members from going any buying million dollar homes off the bat.

The first pillar is avoiding unnecessary and risky activities (don't drink and drive, insurance generally won’t cover your poor decisions) and take good care of your investments (maintain your property, etc) - these simple steps will help you prevent lawsuits before they even occur.

If you have equipment then call a service provider to do a preventative maintenance checkup.

The sooner you can figure out these things up front the more unnecessary communication you have with guests, cleaners, etc down the road.

To prevent Yellowjackets from getting established on you property, ask your property manager to apply 2 times every 6 months and problem solved for 2 years.

This guide should help you prevent that.

A great way to prevent this from being a problem would have been to ask him to send you an email or text, or write out a quick agreement on a sheet of paper stating the agreement.