Here we have an ad publishing a newly planned subdivision, which to give away authorial information, is right around where I live now. The ad promises high quality cobblestone retaining walls and many planted palms. Evidence of both are still there today. This ad was in the 24 March 1906 edition of the Highland Park News-Herald & Journal. That edition also has a number of mentions of this particular subdivision in its various articles, so check it out for more details.
If you’re looking for old editions of local newspapers, including our own Highland Park News-Herald & Journal, you should check out the California Digital Newspaper Collection housed at the University of California at Riverside and available online at https://cdnc.ucr.edu/