Where is the phone number for this vacant property?

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Hello,

I'm a really new agent in San Francisco and I usually find vacant homes, while door knocking.  The neighbors or the mail man inform me about the vacant homes, but had no additional information about them.  

I found this one vacant property that was so messed up that the stairs leading to the doorway was caved in.  Garbage was pressed up against the windows from the inside and paint is chipping off the exterior of the home. The area is generally nice and I know the homes go for about $650-$850 and that this home would definitely grab a high price if it was remodeled.  

I looked up the information through the title company regarding the owner, but the site address and mailing address was the same. 

I tried white pages, zaba search, and spokeo online to look up the phone number, but nothing comes up.  Spokeo showed that the owner was 83 years old.  I also used Cole Information for cell phones and the land line, but the address doesn't come up. 

Any other ideas to contact the owner?