I wonder how fudged are those numbers. I know of a town with tons of idle hotel space yet they report an occupancy rate of 65%, which is within a few percent of the typical range of 70%-90%. I suspect some empty properties are listed as "under renovation" even though no work is being done.

If they are fudged, they are likely to be fudged across all markets.

I reckon SF was hit particularly hard because it has a heavy concentration in tech compared with other large US cities, and tech workers have most avidly embraced wfh?