The Mark Seattle (F5 Tower)

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More than a soaring addition to the Seattle skyline. More than a new standard for Seattle office space. More than a world-class hotel and a historic events venue. And more than a vibrant hub of community. We're building on the Seattle story. The Mark is now the F5 Tower and is 660 ft tall and consists of 44 floors that stretch to be the 6 tallest building in the city of Seattle.