Four years after Covid-19 filled hospital emergency rooms, closed schools and emptied out cities, US offices remain about half vacant.

Office occupancy in 10 of the largest US metropolitan areas rose to a new high of 53% for the week ended Jan. 31, according to Kastle Systems, a firm that provides security to buildings. The firm’s barometer on how corporate return-to-office policies is going has been hovering around that level for 13 months. Yet, cities are shrugging off empty offices and its implications for the commercial real estate market because they can, for now.