Not necessarily…
Even using the existing columns and footings, both live loads and dead loads for residential use are less than for office so that probably gets you from 30 to 40 and perhaps more if you convert to a shallower floor plate which also works better for residential.
If you excavate for additional footings and band the existing columns for additional capacity, you could probably go as high as you’re comfortable pre-selling or renting. That’s what they had to do for the Switch at Station Lands.