The Smithsonian’s plan to build an inflatable pavilion that will bubble out of the Hirshhorn Museum may be put on hold. Announced by Richard Koshalek, the museum’s director, in 2009, costs for the project have tripled from $5 million to $15.5 million over time. If the project comes to fruition, it won’t be completed until 2014. The structure, designed by the architectural firm Diller Scolfidio + Renfro was originally slated to open at the end of this year.

Smithsonian Undersecretary, Richard Kurin, says half of the funds needed for construction have been raised. However, the project won’t move forward without full funding.