While I can imagine some cities might be against "boarding houses" or enforce their "brothel law" I can't imagine too many cities would be supportive of it. 

Landlord representation is all my law firm handles.

Of course, that opens up a whole new can of worms RE the tax implications of having the in-laws live at below-market rents in one of our properties.  

I would learn a little bit more about contract law in your state.

You've probably heard of big Landlords losing property, but only because they were flagrantly violating Fair Housing, running a slum, or otherwise violating the law in an egregious manner.

Not trying to scare you, but a lot of lawsuits happen because the landlord doesn't follow fair housing laws, or simply neglects repairs etc.

Clear office, Sheriff’s office, and law firm associated literally didn’t provide any information. 

Despite this, I have tried to be patient and haven't initiated any eviction proceedings, even though Hawaii Tenant Law allows me to issue a "notice to pay rent" after just 5 days of delinquency.I've heard that if you're having issues with a military tenant, you can contact their commanding officer to help resolve the problem.

To transition to multi-family properties, research landlord-friendly states like Texas, Florida, Tennessee, and Indiana with favorable eviction laws, lower taxes, and higher rental demand.

Sometimes cities will allow this, but it depends on local zoning rules.If neither option works, it might be worth consulting a real estate attorney to explore your options.