Twitter officially moving to Mid-Market:
Quote:

Twitter signs lease for headquarters in Mid-Market
Benny Evangelista, Chronicle Staff Writer
Saturday, April 23, 2011
Twitter Inc. has made it official and signed a lease Friday to move its headquarters from Folsom Street to the historic Market Square building on Market Street.
The microblogging service signed the lease with landlord Shorenstein Properties just three days after the San Francisco Board of Supervisors approved a plan that gives Twitter and other companies moving into the Central Market and Tenderloin areas a six-year break on payroll taxes on new employees.
Twitter, which has plans to increase its workforce from the current 400 to as many as 3,000 by 2013, had threatened to move from the city to the Peninsula if it didn't get the controversial tax break.
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