Parklet on Powell StreetParklets allow sidewalk to be widen to create mini urban parks for people to sit, relax and enjoy the city around them. However, parking spots are lost (or liberated!) when parklets are built.
Parklets can be found throughout different neighborhood and streets. Each parklet features a unique design and features. Resource to make a parklet can be found here.
Here's an SF parklet map made by Curbed SF in April, 2014.