Had an issue with trying to self-permit a build a few years back that was an HPR but had an "A" and "B" designation.

Do you know the laws of the land?

Since you're looking to expand into Florida and other states, I'd recommend starting by narrowing down your focus:Market Research – Florida has great opportunities, but each state and city has different laws, taxes, and demand drivers.

Question about the new CA laws ...

The OP could use it as a template and change it to 30 days and reference the correct county law, or no county at all.

4.Tips to avoid similar issues in the future?

Quote from @Don Bessette: I have a 30 plus year tenant that can not keep up with maintaining their unit, it is filthy inside and in desperate need of renovation, all systems are in good repair and I respond very quickly when issues are brought to my attention.It is also well below market rent, and they struggle to pay the current rate.Looking for suggestions on how to gently proceed with the notification to move. 

And the laws and regulations here are very different, not very strict like the states.Prices are high and rents are low over here.

Ian - do you have any recommendations for a good securities law attorney? 

I have a separate interest bearing account for security deposits as required by my state laws.