This is the 4150th most frequent Polish word.
budynkiem
The Polish word "budynkiem" means "building" (instrumental case).
The word 'budynek' is in its singular, instrumental form ('budynkiem'), describing the building perceived by the subject in the sentence.
Widzę wysoki budynek za rogiem.
I see a tall building around the corner.
The word 'budynek' again appears in its singular, instrumental case ('budynkiem'), providing information about the characteristics and composition of the school described.
Moja szkoła jest dużym budynkiem z czerwonej cegły.
My school is a large building made of red brick.
Here, 'budynkiem' is employed in the singular instrumental case, specifying the building related to the activity of the architect.