Plans for the property call for a 145-unit “luxury” independent- and assisted-living campus called Waterstone on High Ridge. To start construction, National Development plans in November to begin demolishing 110,000 square feet of the existing building. The project is scheduled to be completed in the third quarter of 2021. National has developed nearly 30 senior housing projects, which together account for more than 2,000 units. At the same time, it operates as one of the region’s largest property-management companies, with more than 9 million square feet of commercial space and 2,900 residential units.