Lawsuit claims new Denver skyscraper will collapse after ‘contractor removed key pieces of concrete’

When you hear that one of the tallest new buildings in a major city like Denver could collapse, I think we all at least listen…

The Upton Residences is under construction at Welton and 18th streets in Denver, bringing 461 condo units and two conjoined towers to downtown.

But just as it nears completion, the project’s developer, Amacon, claimed in court filings that a concrete subcontractor, GCon, removed a temporary support system from a floor of the project, leading to cracking, during a dispute between the two firms. If the contractor had continued to remove materials, the lawsuit states, the “consequences of an unsupported structure may result in further cracks and potential collapse of the structure.”

Engineers have said that the towers are safe for the time being, but Amacon has said they are concerned that GCon could remove more materials with potentially deadly consequences. To prevent this, a Denver judge has granted a temporary restraining order to keep GCon employees out of the construction site.

The suspension of work has already caused a 10-week delay in the project, according to Amacon. It’s scheduled to open early in 2026.