The Broad, which is designed by Diller Scofidio + Renfro, will open to the public on September 20. With its innovative “veil-and-vault” concept, the 120,000-square-foot, $140 million building will feature two floors of gallery space to showcase the Broad’s comprehensive collection and will be the headquarters of The Broad Art Foundation’s worldwide lending library. Dubbed “the veil and the vault,” the museum’s design merges the two key components of the building: public exhibition space and archive/storage. Rather than relegate the archive/storage to secondary status, the “vault,” plays a key role in shaping the museum experience from entry to exit. Its heavy opaque mass is always in view, hovering midway in the building. Its carved underside shapes the lobby below, while its top surface is the floor plate of the exhibition space. The vault is enveloped on all sides by the “veil,” an airy, honeycomb-like structure that spans across the block-long gallery and provides filtered natural daylight.