As we described yesterday, there are now over 17 million square feet of empty office space in San Francisco, up from roughly 16 million square feet of empty space three months ago and compared to less than 5 million square feet of empty office space early last year.

For context, the 1,070 foot Salesforce / Transbay tower at First and Mission, the tallest building in San Francisco, contains 1.35 million square feet of office space on 59 floors.

And with the framework we introduced last year, there are now 12.7 Salesforce Towers, or 747 Salesforce Tower floors spread across San Francisco, density) and 131,000 (a la twitter) worker bees.

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