Could be it’s for a specific purpose or use to cater to certain types of commercial tenants, or space to offer additional amenities to attract new leases.

Not all office space is created equal either - theres decent variance between different office spaces depending on space class (A, B, etc), amenities/services offered, targeted, clientele , and of course location.

This building is also in a pretty good location for office space too: right on broad street in the heart of downtown near a subway/light rail entrance, still walkable to/from the train station, across from Military park, and plenty of services and other businesses nearby within walking distance to cater to office and employee needs.

Hanani may be under the impression it’s better to invest in adding on top of an existing asset vs buying a more vacant building.