Dropbox signs San Francisco's biggest office lease ever

File hosting company Dropbox Inc. signed the largest office lease in San Francisco history, taking all 736,000 square feet of the Exchange in Mission Bay.

Dropbox’s 15-year lease surpasses Inc. (NYSE: CRM)’s 2014 deal for 714,000 square feet at Salesforce Tower, previously the city’s largest. It follows recent six-figure leases from tech giants Facebook Inc. (NASDAQ: FB) Inc. (NASDAQ: AMZN) and Alphabet Inc. (NYSE: GOOG)’s GoogleInc. In the past year, deals from mature tech companies rather than startups have accounted for the bulk of major office deals.

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