I prefer to charge an increase to the monthly rent.Do some research on BiggerPockets or Google to learn about screening pets, how much to charge, setting rules, enforcing rules, etc.

You need to have a solid lease with expectations and consequences, and you need the cojones to enforce the rules.

If it is made illegal and gets enforced, they are just going to push it underground.  

Proof of vandalism could be brought to law enforcement as well.

Our lawyer got written confirmation from the city they would not enforce the setback requirements, since the sign was legal before and only their desire to annex land changed the situation.

I keep escrow open with EMD to make sure we can enforce our contract in case the seller stops communication out of nowhere.Yes, I agree with the licensing part.

It's your opportunity to improve your lease agreement and to enforce lease terms that you want enforce and that may not have been in the prior lease.

In my locality, persons are recruited to serve as testers for landlord racial discrimination by the local Fair Housing enforcement agency.

Our current property manager is not cutting the mustard (not enforcing late fees, slow to fill vacancies, etc.) and I would very much like to replace her with someone who will approach our investments with a more business minded attitude. 

Tenant shall pay Landlord reasonable attorney fees Landlord may incur in the enforcement or defense of any term in this agreement.