Lisa Shackelford March 17, 2022 Corporate Expansion St. Louis' HDA expands with plans to open Denver office Lisa Shackelford March 17, 2022 Corporate Expansion HDA Architects recently designed the feature rendering for a $100 million mixed-use development proposal at the southeast corner of Central Avenue and Forsyth Boulevard in Clayton, Mo. Rendering credit: HDA/Green Street Real Estate Ventures.