Is this supermarket or a convenience store? Does it even still exist?

What is this place? Does it have a name? It's not a school but there must be some organization associated with these basketball courts.

Is it really possible to do a u-turn here? This whole section is a little bit suspicious.

3ο Σύστημα Προσκόπων Υμηττού

via StreetComplete 49.2

Attached photo(s):
https://westnordost.de/p/123967.jpg

shop=bicycle?

What's the actual name in Greek? Don't transliterate! (i.e. No greeklish).

"The name of this place is ridiculously long. It's either incorrect or incorrectly tagged."
OSM snapshot date: 2022-06-13T12:43:18Z
POI name: Πρ. Ηλίας,Κάμπος,Αυλώνα,Μικρό&Μεγάλο Ασπροβούνι,Λουτρό,Θωμά,Παπούλια,Μαυροβούνι,Αγ. Ιωάννης,Καταφύκι,Κασιδιάρη&Κάμπος Δ. Κρανιδίου
POI types: leisure-nature_reserve
#organicmaps

The proper street name is Αλέξανδρου Παναγούλη

Barrier here! Also the one way direction is reverse.