What does "their" refer to?

With the mass return to office work still uncertain, the pandemic has sharpened debate about what the future holds for ***their*** commercial hubs.

Question

What does "their" refer to?

With the mass return to office work still uncertain, the pandemic has sharpened debate about what the future holds for ***their*** commercial hubs.

Answer

The word "their" does not appear to refer back to anything in the sentence. Perhaps there is a plural noun in the preceding sentence.

Answer

possesion. Let's apply it to another pronoun

(I) My commercial hubs
(you)Your commercial hubs
(he) His commercial hubs
(she) Her commercial hubs
(we) Our commercial hubs
(they) Their commercial hubs