Trimmed surface to closed brep

hi guys,

how can i make a closed surface from a trimmed surface?
could you please help me?
Kemicentrum (1).3dm (11.7 MB)
Outdoor_CFD.gh (510.3 KB)

please see the files attaced

thanks

You’ve posted this in the Geometry Gym Plugins area, but this seems incorrect.

i cannot change the category