please someone help me on how to locate the owner for a abandon house here in san diego, i’m trying to locate the the onwer to bring it under contract

I use a Title company to find owners of vacant houses. They also send all the tax info & when it was last purchased, the square feet, size of the lot, when it was built and ect.

I got some resistance when I first asked them, they wanted to know who I was and why I wanted this info. I explained I was an investor, I have used their Title company to close some deals and I will be using them again on future deals.

Sometimes I really abuse my privileges, I will send them 20-30 addresses at a time and I wont hear back from them, but I will resend and eventually they send me all the info.