Where Would You Say the Westside of L.A. begins and Why?

I will start this off by saying simply that I believe that Downtown L.A. is the heart ie center of the City. Everything North, East South and west radiate from the center. Main Street , at First Street and Main Street in Downtown Los Angeles, right by City Hall, is actually the start of the North, South, East and West "sides" of the City. I think that is why the "Central" label of "South-Central" Los Angeles was very useful in that it helped to define the Central Southern section of the City as opposed to the "South Los Angeles" area. Central helped to define the area as being in close proximity to the Center of the City or Downtown Los Angeles. In that regard the "Near" West Side of the City ie West Lake/MacArthur Park area, is the West Central Area of the City. A good description for the area I think.