Essentially this is art right out there in the open. The area in Los Angeles is roughly bordered by San Pedro Street on the West and the La River on the East, and on the North and South by 1st and 8th Street.
Some of these photos dipict trhe same wall with different murals. The life of the murals will be short as they will soon be defaced by taggers. Sometimes the building owner or artist later paints them over or removes the tagger scribblings, then the cycle will start again.