Unable to answer "What kind of building is this?" for https://osm.org/way/692839978 via StreetComplete 31.2:

Puerta de entrada y taquillas del Real Jardín Botánico.

Museum? Enteance gates and ticket office for Royal Botanical Gardens, scientific and culturalp institution part of the Spanish Government

Attached photo(s):
https://westnordost.de/p/37523.jpg