Fine them the cost of fixing or replacement and let them know in the future you will not hesitate to file for eviction action for this type of  tampering,, Also I'm sure Fire regulations have some type of verbage for tampering with or disabling fire equipment..

You need to study your state landlord tenant regulations as a landlords responsibility in operating your business.

The enforcing of a lease as out lined by your state landlord tenant regulations in relation to operating a business has little to nothing to do with being a particular type of landlord aside from professional.

All the regulations are spelled out to answer all your questions.1) A tenants lease at expiry automatically becomes M2M under the same lease conditions.2) As the landlord you may ask for the tenant to reapply however it is entirely up to the tenant as to whether they choose to or not.

Key factors include state income tax, property tax, insurance cost and landlord favorable regulations.

It has already started in anticipation of what Trump is going to do to deregulate the finance industry but good news is if Trump relaxes the regulations on the finance industry then loans hopefully will not take so long to close.

This solves the legality problem, because as regulators target airbnb they almost always set 1 month as the threshold.

Legally they choose to leave the matter to the courts as part of the eviction regulations. 

Have you ever dealt with the State Employee regulations? 

Often, investors will work with a select few investor/lenders cross lines of syndicating and brokering activities working with a "pool" of non-regulated lenders.