This is the 742nd most frequent Serbian word.
просторијама
"Просторијама" translates to "premises" or "rooms" in English.
In this sentence, 'просторијама' again appears in the locative case, associated with the location within the school.
У просторијама школе одржавају се разни курсеви.
Various courses are held in the school's premises.
'Просторије' is used here in the accusative case to indicate the spaces that are the object of the action, but it relates to the same term representing rooms or spaces.
Морамо очистити све просторије пре вечерашњег догађаја.
We need to clean all the rooms before tonight's event.
The word 'просторијама' is used here in the locative case, referring to specific physical spaces where the meeting will occur.