Corner (35 5th Ave): Rubin Hall: This NYU dorm (acquired by the school in 1964) was built in 1925 as the Grosvenor Hotel. It was the most expensive hotel in New York City south of 28th Street in 1939 (according to the WPA Guide), with rooms starting from $4 a night. Novelist Willa Cather lived here from 1927 to 1932, but Mark Twain, who died in 1910, never did—NYU's claims to the contrary. This was the dorm (at least in exterior shots) of the title character of the TV show Felicity.
7: Bronfman Center: NYU's Bronfman Center for Jewish Student Life has amazing teakwood bay windows; Lockwood De Forest, artist who worked in teak, lived in and built this 1887 house.
9: More teakwood on a house designed by James Renwick's firm (1888). Novelist Dawn Powell lived here 1931-42, where she wrote Turn, Magic Wheel, The Happy Island, Angels on Toast and A Time to Be Born, and began My Home Is Far Away.
15: Mayfield, a 1920s "collegiate Georgian" building.
21 (corner): University House, neo-Renaissance apartments built in 1923 as The Wordsworth, is home to Spice, styley Thai. Perfect Storm author Sebastian Junger is said to have lived here. It was also where Ann Sothern's character lived in The Ann Sothern Show, which ran from 1958-61.