Speaking of downtown street cleanliness, I've always wondered if the city could impose a small tax (more or less a fee) on downtown businesses to steam-clean downtown sidewalks once a week. Is such a process even possible? Could they get the money from the CRA budget? Could a business association impose and collect the fee and provide the service?
And how do we kick into high gear the effort to add more trees and street furniture, and improve some pedestrian crossings?
Additionally, here's an idea that I'll explain with a picture of one of the streets in Cambridge, Massachusetts which is right next to Boston:
The brick lining really adds character to the sidewalk. In L.A. this might not necessarily be red bricks (maybe they're lighter and larger bricks), but the goal should be do provide a change up to the boring concrete slabs without increasing the city's water consumption.
Also, I love the extended sidewalks. It adds a parking space to every corner, space for street furniture and most importantly it visually shortens the distance pedestrians have to walk to cross the street.
Then again, as people have already stated in this thread, all these suggestions may just be academic, because until there is more street-facing retail and open spaces people won't have any reason to walk around. But it could be argued that building owners won't convert their ground floors to retail until more people start walking. It's the old chicken vs. the egg!