O-A-K offers commercial construction services to clients in Michigan, Florida, and Colorado. Driven by partnership, we are determined to build the best experience. Employee-owned since 1891, we focus on Construction Management contract delivery within seven distinct industries, including K12, Higher Education, Commercial, Community, Government, Healthcare, and Aviation. Corporate office locations: Grand Rapids, Michigan; Kalamazoo, Michigan; Fort Myers, Florida; Naples, Florida; Castle Rock, Colorado.