The final steel beam was just put into place atop the Whitney Museum’s new Renzo Piano-designed location downtown, finalizing the outline of the nine-story, 200,000-square-foot building that is set to open in 2015.

“We’re delighted to share this milestone event with our partners at Turner Construction, Renzo Piano Building Workshop, and Cooper Robertson & Partners,” Adam D. Weinberg, the museum’s director, said in a statement. “The future Whitney will be an aspirational space where contemporary artists can realize their visions and audiences can connect deeply with art.”

A flag flew half-mast atop the structure alongside a banner that said “NY Loves Newtown” in commemoration of the victims of the Sandy Hook Elementary School shooting.