I know I sell Yellow Letter Mail letters however there was a time in my life when I cold called active for rents from the classified section of hte newspaper...

I just heard to look up classifieds in newspapers and call the ads that have apartments for rent to see if the owners would like to buy more properties or sell them.

Unfortunately, it happens all the time in real estate (ex. multifamily investors advertising only in Korean newspapers [New York] or hiring Spanish-only speaking staff who can only communicate with Spanish speaking prospective tenants). 

My mother signed up for a duct cleaning from one of the companies advertising in the newspaper. 

Call the local newspaper and ask them where people advertise their rentals and see if you can get copies of their old newspapers? 

(I have the photographs of the signs posted on the property for the upcoming sales and I have the Patriot News paper copy that shows they posted the Upset sale in the paper)Q?

I also went through the newspaper obituary section and located the addresses of people who had passed away, I targeted addresses that were fully paid off, and ones that were not.  

if you get the run around, call your local newspaper to get a story in the paper about the police doing damage and city hall not willing to be accountable...just my opinion !

Understand, the article is from a Chicago newspaper, which is obviously not California. 

Without a proper address, the notice would have been by posting the property and newspaper publication.