Thanks for the response, @Kiersten Vance!  

Thank you so much Rich, Jay and Sam for all your good advice and quick responses. 

Also have language explicitly stating that they are responsible for any service charges associated with the tank running empty.

Although the specific interest(s) that underlie a criminal history policy or practice will no doubt vary from case to case, some landlords and property managers have asserted the protection of other residents and their property as the reason for such policies or practices. 23 Ensuringresident safety and protecting property are often considered to be among the fundamental responsibilities of a housing provider, and courts may consider such interests to be both substantial and legitimate, assuming they are the actual reasons for the policy or practice."

If they own several they are obviously investors.Once you get a response from the seller of the vacant house, negotiate a deal to buy it for all cash and get it under contract. 

Hi All,My Name is Vikas i am newbie in this community work as a Accountant in a MNC Company , My purpose of coming here in this so that i can as my doubts and questions related to all stuff.I hope you will help me out on this platform .Thanks,

Looking at the data you correctly found a drop in rent growth (for all practical purposes it went to zero) and a drop in occupancy in 08 and 09. 

Am I responsible for covering the cost of extermination if the cause of the infestations (cats and trash) are from the tenants?

@Riley Hinshaw sorry you did not get any responses!

Troy Norwood , I'm actually interested in building for investment purposes.