A groundbreaking ceremony was held Tuesday to celebrate the start of construction of a three-story, 65,000-square-foot medical office building at 2999 N. Mayfair Road. The $20 million project, called the Mayfair Medical Building, is being built by the 16 doctors of the Radiology Association of Milwaukee and Pewaukee-based VJS Construction Services. The radiology association will have a clinic that occupies about 40 percent of the building. The construction and permanent financing for the project is being provided by Flint, Mich.-based Citizens Bank.