Hunting down a Vacant property owner

[Deangelo Mack]

I went driving for dollars today and found some old, ran down vacant properties in some desirable area. I used a free public search (https://www.fastpeoplesearch.com) to find the owners phone number. Sometimes this web sites comes through but majority of the time I get old phone numbers. What are different methods I can use to get the owners contact info. Please help. Thanks