Thanks for adding these details. Only thing I'm not sure about is the names you gave to these courts. Is there a sign on each fenced-off area that labels it as "Jefferson Park Lower Courts" and such, or is that simply a name you're using to describe the upper courts?

A big element of mapping in OpenStreetMap is verifiability; that is, another mapper should be able to visit the location and see that something's name is as mapped, or that it has lighting, etc.

But thanks again for your contributions here and around Seattle, and welcome to OpenStreetMap!