Garden City Companies, a provider of legal administrative services, completed the acquisition of Duncan & Sons Building Maintenance, a commercial janitorial and facilities maintenance company. Financial terms were not disclosed. “The Duncan Standard has always been about serving people. From our cleaners to executive management, everyone prides themselves for leading with a servant heart. With Garden City’s investment, we’re now equipped to further advance our mission and better serve our manufacturing, logistics, healthcare, education, office and church clients with the best cleaning service in the industry," Luke Duncan, Duncan & Sons CEO.