No rule for this one
No ending or word group predicts the article of Büro. Learn it as a pair and say it out loud: das Büro.
Nouns ending in -o only take das 51.9% of the time, so that is not a rule we teach.
das Büro
It's das Büro. Büro is neuter, plural die Büros.
Das Büro ist im zweiten Stock.
The office is on the second floor.
No ending or word group predicts the article of Büro. Learn it as a pair and say it out loud: das Büro.
Nouns ending in -o only take das 51.9% of the time, so that is not a rule we teach.