Then those activities you listed become the safety buffer that you can lose in an argument with the IRS and still have 750 hrs.Also, there's a controversial issue about an election to aggregate.

Do your best to mitigate issue before they crop up and annoy residents.Maybe create a free service, for those that are not using your management services, to come and review their STRs for safety, procedures for help etc.

What are the best ways to prepare for the Law & Safety and General B license?

We do owner occupy the space below it, so don't want ourselves and our staff exposed to hazardous chemicals either. 

Most employees want safety and security, so, I put most of my staff on salary with unlimited time away.

Mainly because the essential repairs were standard safety items, or necessary cosmetic updates.

I am about 9 years in the roomie/tenant house hack (where i basically PM'ed for the LL from the inside); and about 2.5 years in the roomie/LL bucket. one piece i will add, i try my best to not "call shots" and keep things pretty democratic/ open for dialogue discussion between everyone. unless its a safety issue (or a liability issue, like guests can be)... i prefer this to be "our home" instead of "my house". 

Life long tenants just stay in the same places and look for housing based on cost along NOT schools not safety etc.

From our perspective make sure you are thinking about durability, accessibility (from a maintenance perspective), safety.

Your title and hazard insurance could get messed up.