A little more on the Hauser Packing Company. Here's an article from the Los Angeles Herald, dated 3 September 1905:
cdnc.ucr.edu
The 1921 Baist map still shows a fairly sparsely populated site:
www.historicmapworks.com
By 1948 the site had filled in. The old Santa Fe railroad route can still be seen curving into the site, but no rails are visible. The 1952 aerial looks much the same, but most of the site had been cleared by 1972.
Historic Aerials