I worked in downtown Los Angeles most of my working years. My job prior to the one I have now, I worked on 3rd and Grand for nearly 20 years.
I remember old downtown L.A. when most of the "big" stores were on Broadway. I remember when the tallest building downtown was City Hall which is now dwarfed in comparison to other buildings and is no longer the heart of downtown. In this picture it's the smaller white building on the right that comes to a peak. I can vaguely even remember taking the trolley with my mother and the sparks from the wires which is probably why I remembered it from such a very young age. It was the place everyone went to shop and had the best movie theatres around.
Broadway now is run down and laden with nothing bus discount stores. All of the major stores moved west into places like the Broadway Plaza when malls became the new rage and building became skyscrapers. It has certain changed over the years but change isn't always a bad thing and the buildings are beautiful.
Pictured below are just some of the buildings and focal points of downtown Los Angeles - The Music Center, MOCA, the main library, Walt Disney Concert Hall. I will mention that the Water Court between the California Plaza towers is spectacular and host a string of evening concerts in the summer. There are pictures on the water court in the slideshow below.