The Broad Collection museum in downtown in Los Angeles filed a $19.8 million lawsuit against the German subcontractor hired to carry out the most distinctive design features of the museum’s exterior.

The Broad, as the $140-million, 120-square-foot museum will be known for short, is being built by Eli and Edythe Broad to house their extensive art collection of nearly 2,000 works. The outside facade, known as “the veil,” consists of a honeycomb-style shell made of steel and glass-fiber-reinforced concrete that wraps around the building’s exterior.

The lawsuit filed in Los Angeles Superior Court alleges that Seele Inc. and affiliates “did not possess the necessary skill, experience, resources, commitment or ability to perform the work at The Broad museum.” This resulted in delays that have put the project at least 15 months behind schedule and have driven up construction costs by at least $19.8 million. The museum had planned to open by the end of 2014 but announced in February 2014 that the date has been pushed to 2015.

Pillsbury litigation partner Robert Thum is representing the Broad Collection and MATT Construction, the museum’s general contractor.