Anyone great at DIY skiptracing?

[Kate Lee]

Hi - I'm trying to figure out DIY skip tracing to find owner name and phone of commercial properties.  I only have the property address to start with.

Out of 100 addresses, I can only find about 70% of the owner phone contacts.  I'm wondering what other BETTER platforms you use to track down these contacts.

This is what I've been using: 

(1) opencorporates.com

(2) https://www.fastpeoplesearch.com/

(3) tax assessor by state