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"By scouring key-card and mobile phone-access data in 10 key cities, we can see where office life is getting back to some semblance of normal (as in Texas) and where offices remain largely vacant (as in California)." https://www.bloomberg.com/opinion/articles/2022-03-03/return-to-the-office-post-omicron-americans-prefer-to-be-anywhere-else