Have a guest policy in place and stick to it.

If so, get an attorney to file a complaint at the state board and have an attorney notify their errors and omissions policy. 

Texas has that mix of affordability, business-friendly policies, and solid job growth that really drives demand for housing.

Quote from @Raghavendra Jakkani: My policy is that they pay a prorated rent for the first month.

It goes deeper than that.NYC Liberal policies, including strong tenant protections, increases the risk of failure so much that the risk far outweighs the rewards.Financial ruin is just around the corner for the small Mom and Pop Property Investor that it doesn't make sense for them.The Tenants will have free Attorneys that are bent on delaying eviction cases so long that it stretches into years while Mom and Pop suffer from lack of rental income and still have to pay all the bills and do the management.Additionally, the increase in homeless living rough in the streets due to Sanctuary laws causing a lack of shelter beds, then evicting shelter residents after 30 days creating more homelessness, policies that tie up the Police's ability to arrest perpetrators, etc. only causes Mom and Pop to sell out at large discounts to larger Landlords who are capable to use Economies of Scale to eek out a profit.These larger Landlords will eventually turn a much higher profit as the pendulum will eventually swing towards the middle when the NYC Voting population eventually realizes that it's not a conspiracy of the Rich that's causing the Wealth Gap to increase.It's the same liberal laws that encourage people to become lifelong tenants, small Entrepreneurs (including Property Owners and small Mom and Pop Businesses) to be destroyed, and Rents to rise astronomically as housing becomes scarer even when the population declines by as much as 7% in the last several years. 

@David Niles you are right on policy.

In cases like this, a police report and insurance claim (via tenant's rental insurance policy first, mine second) would be (have been) my first choice. 

But for vacant properties, I think a 'show and go' policy would be ideal: the buyer’s agent can confirm directly with the listing agent, and then they’re free to view the property without delay.

Here in the Reno Tahoe area insurance companies won't write policies for a roof over 15-20 years old even if it's in good condition.

You may need to get a new title policy if you had one from the past.