880 Fifth Avenue

The Ogden Mills House was a former mansion located on 2 East 69th Street in the Upper East Side of Manhattan in New York City.

The C. Ledyard Blair House was a mansion on 2 East 70th Street, at the corner with Fifth Avenue, on the Upper East Side of Manhattan in New York City. It was constructed for banker C. Ledyard Blair and designed by Carrère & Hastings. The house was constructed from 1914 to 1917 and occupied almost 7,300 square feet (680 m2). It was sold and demolished in 1927 to make way for an apartment house.

The Explorers Club is an American-based international multidisciplinary professional society with the goal of promoting scientific exploration and field study. The club was founded in New York City in 1904, and has served as a meeting point for explorers and scientists worldwide. The Explorers Club hosts an annual dinner to honor accomplishments in exploration, which is known for its adventurous, exotic cuisine.

The William C. Whitney House was a mansion located on 871 Fifth Avenue and 68th Street in the Upper East Side of Manhattan, New York City. It was originally constructed for Robert L. Stuart who died before it was completed. It was next sold to Amzi L. Barber before it came into the ownership of William C. Whitney in about 1897.

The Frick Art Reference Library Photoarchive is a study collection of more than one million photographic reproductions of works of art from the fourth to the mid-twentieth century by over 40,000 artists trained in the Western tradition located in the Frick Art Reference Library on the Upper East Side of Manhattan. It was founded in 1920 by Helen Clay Frick, the daughter of industrialist Henry Clay Frick, to facilitate object-oriented research. The documentation it offers records the essential elements of the biography of the work of art: the artist, title, present owner, as well as historical information such as changes of attribution, ownership and condition, all of which are essential for the study of the history of art.

The Frick Art Reference Library is the research arm of The Frick Collection. Its reference services have temporarily relocated to the Breuer building at 945 Madison Avenue, called Frick Madison, during the renovation of the Frick's historic buildings at 10 East 71st Street (between Madison and Fifth Avenue) in New York City. The library was founded in 1920 and it offers public access to materials on the study of art and art history in the Western tradition from the fourth to the mid-twentieth century. It is open to visitors 16 years of age or older and serves the greater art and art history research community through its membership in the New York Art Resources Consortium (which also includes the libraries of the Brooklyn Museum and The Museum of Modern Art). Within the library is the Center for the History of Collecting—a research organization that supports the study of the formation of collections of fine and decorative arts, both public and private, from Colonial times to the present through its fellowships, symposia, and publications.

The Richard Morris Hunt Memorial is a memorial to the architect Richard Morris Hunt, designed by Bruce Price with sculptures by Daniel Chester French, located in Central Park in Manhattan, New York.The bronze bust of Hunt was cast by the Henry-Bonnard Bronze Company of New York. The monument was erected in 1898 by the Art Societies of New York, a coalition of a number of municipal cultural institutions associated with Hunt: the Century Association, the Municipal Art Society (whose first president, in 1892, was Hunt), the Metropolitan Museum of Art (whose main building was designed by Hunt), the Artist Artisans of New York, the Architectural League, the National Sculpture Society, the National Academy of Design, the Society of American Artists, the American Institute of Architects (co-founded by Hunt in 1857), the American Watercolor Society, and the Society of Beaux-Arts Architects.

The Frick Collection is an art museum in New York City. Its permanent collection (normally at the Henry Clay Frick House, currently at the Frick Madison) features Old Master paintings and European fine and decorative arts, including works by Bellini, Fragonard, Goya, Holbein, Rembrandt, Titian, Turner, Velázquez, Vermeer, Thomas Gainsborough, and many others. The museum was founded by the industrialist Henry Clay Frick (1849–1919), and its collection has more than doubled in size since opening to the public in 1935. The Frick also houses the Frick Art Reference Library, a premier art history research center established in 1920 by Helen Clay Frick (1888–1984).

The Lenox Library was a library incorporated and endowed in 1870. It was both an architectural and intellectual landmark in Gilded Age–era New York City. It was founded by bibliophile and philanthropist James Lenox, and located on Fifth Avenue between 70th and 71st Streets on the Upper East Side of Manhattan. Renowned architect Richard Morris Hunt designed the building, which was considered one of the city's most notable buildings, until its destruction in 1912. The library's collection was unsurpassed in its collection of Bibles, and included the first Gutenberg Bible to cross the Atlantic. It was also known for its collection of Shakespeare, Milton, and early American literature. The library became a part of the founding collection of the New York Public Library (NYPL) in 1895, and opened to the public as part of the NYPL's Main Branch in 1911.

The Henry Clay Frick House was the residence of the industrialist and art patron Henry Clay Frick in New York City. The mansion is located between 70th and 71st Street and Fifth Avenue on the Upper East Side of Manhattan. It was constructed in 1912–1914 by Thomas Hastings of Carrère and Hastings. It was transformed into a museum in the mid-1930s and houses the Frick Collection and the Frick Art Reference Library. The house and library were designated a National Historic Landmark in 2008 for their significance in the arts and architecture as a major repository of a Gilded Age art collection.

The Isaac Stern House was a mansion at 858 Fifth Avenue in the Upper East Side neighborhood of Manhattan in New York City.

The George J. Gould House was a mansion at 857 Fifth Avenue on the northeast corner of 67th Street in the Upper East Side neighborhood of Manhattan, New York City.