I think “the whole building burned” is a bit hyperbolic. Building was covered in the now known to be spectacularly flammable exterior foam insulation panels. Those panels are now largely banned because of several fires.
It had intact windows and fire sprinklers when the cladding ignited on one side at the lower floors pedestal (A/C equipment on pedestal roof? Unknown). It burned up one side and marginally around its corners. Most windows eventually failed in the fire but sprinklers held and internal damage was only moderate. Building occupants safety measures held reasonably from what I have heard, evacuated safely.
It’s going to take a lot of repair but wasn’t that catastrophic. No sign that it’s going to need to be demolished or anything crazy.
Should not have happend… but life safety systems worked.