Unable to answer "Is this still here?" – Lowry Montessori School (School Grounds) – node/2812539402 via StreetComplete 63.1:

It's the Mile High Early Learning, City and County of Denver

Unable to answer "Who is allowed to park here? Parking may be free or paid." – Parking Lot – way/644181127 via StreetComplete 63.1:

I've never seen any signs that say it's only for Post Office use... But it seems like that's the expectation.

Unable to answer "What’s the surface here?" – Basketball Court – way/276669863 via StreetComplete 63.1:

This. Basketball court was removed, there is now a new one further north.