You can go to local R.E meet ups, facebook groups, and try to find wholesalers who have discounted properties. 

BP, Facebook, Realtors, meetups. 

But the problem is when there is a change in status of the listing for any number of reasons (including SOLD) Zillow is very slow to update status.

A duplex doesn't require meeting the self - sufficiency rule, but a 3 - 4 unit does require meeting that rule and with the high prices in CA that doesn't always work.Self-Sufficiency Rule:The maximum mortgage amount for 3-4 unit properties is limited, so that the ratio of the monthly mortgage payment, divided by the monthly net rental income does not exceed 100%, regardless of the occupancy status.

I would go on a local Facebook group (most cities have a jobs/for hire page), use the phone book as well as Craigslist and get a few quotes.

Bigger Pockets is like a positive and productive version of Facebook.

They deserve credit for taking swift action to rectify their listing.The second one was brought to our attention by somebody who found "our house" on Facebook.

Facebook, craigslist, or a typical strategy that worked for them to starting out. 

There are other tax implications in regards to this status.

I’m aware of sites like Craigslist, and Facebook marketplace, but would love to hear from people about their preferences and experiences