Hi,
The tag leisure=horse_riding should be used for the whole area of the equestrian centre and not for one of its buildings; see
https://wiki.openstreetmap.org/wiki/How_to_map_a#Riding_centre_(equestrian)
https://www.openstreetmap.org/way/1414612042#map=18/46.733952/1.837926&layers=P (example)