Some sectors, such as banking, signalled early on that they would expect staff to return to the office, while others, often in the tech industry, have said they will allow remote work indefinitely. Many places have opted for a mix.
Office occupancy in the US is at about 43%, according to data from Kastle, which runs security card access systems at thousands of buildings across the country.
Musk rarely takes holidays and during a crunch period for Tesla a few years ago, he slept on the factory floor.
“The more senior you are, the more visible must be your presence,” he wrote in one of the emails on the remote work policy.
“That is why I lived in the factory so much – so that those on the line could see me working alongside them. If I had not done that, Tesla would long ago have gone bankrupt.”