Visitors enter through a glass entry vestibule off Fifth Avenue into an 45-foot-high lobby with one wall and the ceiling a single curving expanse of etimoe wood; the lobby leads to the gift shop, ticketing and information, the theater, the café, coat rooms, and toilets, as well as an interactive room for orientation and an arts workshop. The grand stair, embraced in a circular copper-colored perforated-metal drum with diamond-shaped apertures in a spiral pattern, will glow like a lantern. The second floor provides 12,800 net square feet of flexible gallery space, typically to be organized as three temporary exhibition galleries and two galleries for the permanent collection that can be experienced individually or in a loop. The public spaces of the museum culminate on the third floor with a gracious event space that includes a roof terrace offering dramatic views west over Central Park. Administrative offices are housed on the third floor, along with the library, the boardroom, the auction room, and catering prep area. One level below grade accommodates conservation, documentation, and collection storage. A 40-foot lockable loading dock bay on the ground floor allows a tractor-trailer to pull in and the doors close behind it, as required for accreditation by the American Association of Museums.