How to farm property owner phone numbers?

[Michael Mun]

Hello,

I am an active real estate investor focus on single family flips. I usually flip 3 to 4 properties a year and I'd like to get into the commercial game now. I'm trying to farm a list of 8+ unit apartments in Southern California but I don't know how I can get the phone numbers of all the property owners to these apartments. I'd like to broker some deals for people as well and find my own deals. Hope someone can help me out. Thank you!