I'm doing this for off-market lots right now, I find the owner's name/address on the county assessor's site and then just search their name/city online and find their phone number about 50% of the time.

PM me the address and I can send you some comps. 

That doesn't really address your needs or your unique liabilities.

Center on your house address then search near by:  banks.  

You aren't going to be made whole given the vast amount of the claim against so little assets/worth.More realistically, you may own a property worth $40k with a need for $10k to address tenant damages while the tenant doesn't have $10k laying around or stashed in his/her pillow.

This is a pretty common second option to address the safety portion of this problem.

For cases where the address of property and mailing are the same, you look at the tax bill to see if it is getting paid.

I hired a process server last week to deliver a "notice to perform" letter to is address last week and so far hasn't been successful either.

Main house with and extra house on an extra lot with it's own address.

Going through the local government will give you a name and mailing address, skip traces can sometimes help find a phone number for the owner.