How to obtain owner information to a property?

[Konrad R.]

I'm interested in purchasing a distressed property near one of the properties I purchased. I looked up the tax parcel information. It isn't available online. For some reason, it completely skips over that address. I called the tax appraiser office, and she didn't know why either. She said it could be because it is owned by a judge or police officer, and he/she elected to have the information be confidential. She wasn't sure, however. What are some reasons why the information would be not publicly available? I could see if they blocked the name and address, but they don't have any information on it. I am unable to even click on it from the map. 

What are some other methods to obtaining the owner's information?