DETROIT-About 1,700 employees of Rock Holdings Inc., which includes subsidiaries Quicken Loans, Rock Gaming and Fathead, began moving in today into four floors of the 1.1-million-square-foot Compuware building Downtown. The move is heralded as another much-needed success story for the struggling Motor City, with its 30% office vacancy rate, though this move is less than the new office tower that CEO Dan Gilbert had wanted to build in 2007.

Rock will occupy about 244,000 square feet of the 15-story building, taking the ninth through 12th floors. Constructed in 2003 for $350 million, the complex at the center of the Campus Martius district is of the few new office towers built in the past 20 years in Detroit.

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