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Mark Ein

Credit: Courtesy Kastle Systems

Kastle Systems buys stake in Sterling, Va.’s i2G Systems, its biggest-ever investment

Only about 1 in 4 DC-area workers have returned to the office

Ein: DC’s Citi Open could be best ever

Tiafoe, Kastles find new tennis homes in DC

Mark Ein saved Citi Open — can he make it a destination?

Washington City Paper names new publisher