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MILWAUKEE — Brookfield, Wis.-based Hammes Co. has unveiled plans to move its headquarters to downtown Milwaukee in early 2018. Hammes will occupy the top two floors of a five-story office building the company is developing in the Park East corridor. The development is located at North Water and East Knapp streets. The first phase of construction will cost approximately $27 million, according to Milwaukee Business Journal. A second phase would add an additional office building.