From a New York Curbed.com online article:
There’s also a special focus on architecture and design in this new approach to the collection: Several galleries are devoted to various aspects of those fields, including “The Vertical City,” an examination of skyscraper construction that includes photos by Berenice Abbott, Hugh Ferriss’s architectural drawings, and other ephemera. Elsewhere, building models of the Guggenheim and a spec design of MoMA by modernist master William Lescaze emphasize the importance of architecture to museums, and vice versa.
…the museum is about to reveal its most ambitious revamp yet: On October 21, MoMA will open its expanded headquarters, which now takes up most of the block on 53rd Street between Fifth and Sixth avenues. The museum has pushed westward, opening more than 40,000 square feet of fresh galleries in both a ground-up building (which rose from the ashes of the Tod Williams Billie Tsien Architects-designed American Folk Art Museum) and the base of Jean Nouvel’s supertall skyscraper next door.
The galleries aren’t all that’s been added, though: The museum has also opened a new, expansive lobby—which has two galleries that can be visited free of charge—as well as a spacious gift shop that has been relocated below street level. A wall of windows gives passersby a glimpse into the space, and is intended as a gesture of “increased transparency,” according to the museum.