Spanish · Pronunciation Guide
lah oh-fee-SEE-nah, four beats — the c before i is an s, not a k.
Four syllables, o-fi-CI-na, with the weight on the second-to-last, following the default rule for a vowel-final word. The plural "oficinas" keeps it. The related "oficial" ends in l, so its beat moves to the final syllable — same stem, different ending, different rhythm.
Listen: la oficina
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Su oficina está en el centro.
Her office is downtown.
Listen: Su oficina está en el centro.
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"Su oficina está en el centro" links "su oficina" across the u into the o. "Centro" has a soft c before e and a tapped r in its cluster: SEN-tro. And "su" is ambiguous between his, her and their, which Spanish tolerates far more comfortably than English.
The English "office" pulls the stress to the front and cuts the word short. Spanish has four full beats with the peak on CI. The c then gets hardened into a k, giving "o-fi-KEE-na", by readers who have not absorbed the c-before-i rule. And the two unstressed vowels at the front want reducing when they should stay clear.