Add to that the simple issue that the unoccupied condos are still private property, and they can't be summarily taken over and repurposed as shelters without going through a very long and very expensive eminent domain battle, which the government would likely lose by the time things made it through the state and likely federal court systems. Same with any other tourist/second/snowbird homes. A place isn't "available" just because it was empty when the Census Bureau did its nose count.