INDEPENDENCE, MO. — Hamilton Zanze has acquired Cornerstone Apartments in Independence near Kansas City for an undisclosed price. Built in 2004, the 420-unit apartment property features 14 buildings. Community amenities include a fitness center, indoor-outdoor pool and spa. Hamilton Zanze plans to upgrade the business center and clubhouse as well as add a dog park and package storage system. Mission Rock Residential will manage the property. The seller was not disclosed.