Relative to remote work, working downtown allows workers to interact with other commuters, but entails commuting costs. The resulting coordination mechanism can lead to multiple stationary equilibria with different levels of commuting. Temporary shocks in the number of commuters, like the COVID-19 pandemic, can then lead to persistently large fractions of remote workers. Consistently, using cell-phone-based mobility data for the U.S., we document that trips in the largest cities have stabilized at levels that are only about 60% of pre-pandemic levels, while smaller cities have returned to pre-pandemic levels. U.S. cities that exhibit multiplicity experience average welfare losses of 2.7%.