Here is an interactive map, created by the Robert Redford Conservancy for Southern California Sustainability, showing the approximately 1,573,777,062 square feet of industrial space that can be found in Los Angeles, Riverside, and San Bernardino.
The map allows you to zoom in on specific parcels to see things like site area, warehouse size, and year built. You can also play around with different map radii to create a rollup of warehouse space within a specific area, which includes an estimate of daily truck traffic and CO2 produced.
The Guardian also used this data to create the following chart, which is helpful in showing the dominance of certain cities, as well as how much of this industrial space has been built since 2010: