A 33-story downtown apartment project across the street from Busch Stadium is in jeopardy after a purchase agreement between the St. Louis Community College and a development team led by HDA Architects fell through.

Paul Zinck, vice chancellor for finance and administration of St. Louis Community College, said the development group notified the school it would terminate its purchase agreement in late July and the school is once again marketing a six-story building it owns at 300 South Broadway for sale, which had been the site for the proposed tower.

It’s unclear why the deal failed to materialize.

HDA Architects’ owner and CEO Jack Holleran said the firm continues to pursue the $100 million project at that property moving forward. Such a transaction takes “considerable time with a multitude of shareholders. We are continuing to work on the deal structure with a goal to start construction fourth quarter 2019,” he said.

HDA was partnering with two Chicago companies, White Oak Realty Partners and CA Ventures, on the 265-unit development. Holleran did not disclose if those two firms are still included in the financing of the project.