With this option, I worry about the potential risks of having an inaccessible crawl that I can't see. 

@Ellen AlvarezI would put down some traps in places inaccessible to kids/pets (i.e. behind major appliances) and make sure you determine the rats' access point. 

I have a couple of Air BnB units that are inaccessible at the moment due to the flooding.

Whenever it rained, there was 6-8in of standing water making it completely inaccessible. 

It has mechanic liens on it and has back taxes in access of 50k.

Think of what agents could do: not submit other offers, put bad BPO's on the property, make the property inaccessible for other buyers, etc.When you sell a property you are the listing agent and could sell the properties at a reduced or no commission.

Of course they are also wearing shorts and a tank top too....If feasible and legal, I would remove all thermostats from individual apartments and have one master thermostat in the boiler room (or some other room inaccessible to the general tenants) set to a specific temp and set to shut down entirely or partially (in case it also heats the shower water) from April to October.

Guns must be locked and inaccessible to any child under 18.The Government would have the right to come and inspect that you are storing your gun safely away from accessibility to children and fine is punishable for up to 5 yrs. in prison.Go to the website and take your pick of many options to read this.http://www.opencongress.org/bill/111-h45/text

Put in access panel if its behind wall. 

An eviction for owner or relative move-in would still be allowed under our proposed moratorium, although it would require sufficient notice so as to mitigate housing instability for the displaced tenant in our unaffordable and inaccessible housing market.