What else are you going to do with them? Subsidize businesses through tax breaks or pay to upkeep them through taxes are the only answer. It is incredibly expensive to turn office space into residential space. Ideally any new office space or residential would require a plan to convert to one or the other before being approved, but who saw WFH being so widespread 30 years ago?

The worst scenario is that businesses en masse begin breaking their leases and the buildings quickly fall into disrepair. I’m sure there’s people working on a solution to move all the plumbing and infrastructure out of a central core to make better use of these structures. It might be best to keep things as they are until that happens.