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O’FALLON, ILL. — Holland Construction Services is underway on a $39 million senior living community known as Keystone Place at Richland Creek in O’Fallon, about 20 miles east of St. Louis. Upon completion, the four-story building will offer 64 independent living units, 66 assisted living units and 19 memory care units. There will also be one guest suite. The five-acre development will also feature a memory garden and a courtyard. Keystone Senior Management Services Inc. is the developer. Completion is slated for early 2021. The project is being constructed next to Parkway Lakeside Apartments, which Holland built several years ago.