This is the 10561st most frequent Turkish word.
bürosunun
"Of his/her/its office" or "of the office."
The word 'bürosunun' refers to the possession of the office belonging to Ali with the root word 'büro' meaning 'office' and the possessive suffix '-su' indicating ownership, followed by the case suffix '-n' for location or relation.
Ali'nin avukatlık bürosunun yeni adresini öğrendim.
I learned the new address of Ali's law office.
Here 'bürosunun' describes the bookshop's office, demonstrating possession ('-su') and relation ('-n'). It provides contextual information about the office belonging to the bookshop.
Kitapçı bürosunun çalışma saatleri değişti.
The working hours of the bookshop office have changed.
In this sentence, 'bürosunun' refers to the office of the company with ownership indicated by '-su' and relational aspect through '-n', showing that the decoration pertains to the office.