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GREEN BAY, WIS. — Architecture, engineering, environmental and planning firm ISG is moving into the WaterMark building in downtown Green Bay. The firm will occupy 14,000 square feet. ISG is currently designing its new space on the third floor and anticipates a September 2018 move-in. After acquiring Raasch Associates in September 2016, ISG has grown its Green Bay presence by more than 40 percent. Three Sixty Real Estate Solutions LLC developed the six-story WaterMark building, which anchors the CityDeck, a community venue for dining and outdoor concerts.