This is the 874th most frequent Norwegian word.
bygningen
The building.
The word 'bygningen' is used here as the definite singular form of the noun 'bygning', referring to 'the building' in question.
Jeg ser på bygningen fra vinduet.
I am looking at the building through the window.
Here, 'bygningen' is used to refer specifically to 'the building' associated with an old story, emphasizing its definite and singular status.
Det var en gammel historie knyttet til bygningen.
There was an old story associated with the building.
In this sentence, the term 'bygningen' is again the definite form, denoting the specific building being described in the context.