Question: Metropolitan Life North Building is connected by an elevated walkway to a tower designed by which architectural firm ?

full_context: Document 1: Prudential Tower: The Prudential Tower, also known as the Prudential Building or, colloquially, The Pru, is an International Style skyscraper in Boston, Massachusetts. The building, a part of the Prudential Center complex, currently stands as the 2nd-tallest building in Boston, behind 200 Clarendon Street. The Prudential Tower was designed by Charles Luckman and Associates for Prudential Insurance. Completed in 1964, the building is 749 ft tall, with 52 floors. It contains 1200000 sqft of commercial and retail space. Including its radio mast, the tower stands as the tallest building in Boston and is tied with others as the 77th-tallest in the United States, rising to 907 ft in height.
Document 2: Hedden Construction Company: Some of the finest buildings in New Jersey, New York City, and other large eastern cities were built by the Hedden Construction Company, one of the largest construction companies operating in Newark in the very early 1900s. Among the most notable is the Metropolitan Life Insurance Company Tower located at One Madison Avenue in New York, NY. The tower was the world's tallest building from 1909 to 1913 and home to the Hedden Construction Company's main offices located on the 36th and 37th floors. During this prosperous period over $40,000,000 in construction contracts and payments were collected by the firm.
Document 3: Metropolitan Life Insurance Company Tower: The Metropolitan Life Insurance Company Tower, colloquially known as the Met Life Tower, is a landmark skyscraper located on Madison Avenue near the intersection with East 23rd Street, across from Madison Square Park in Manhattan, New York City. Designed by the architectural firm of Napoleon LeBrun & Sons and built by the Hedden Construction Company, the tower is modeled after the Campanile in Venice, Italy. The hotel located in the clock tower portion of the building has the address 5 Madison Avenue, while the office building covering the rest of the block, occupied primarily by Credit Suisse, is referred to as 1 Madison Avenue.
Document 4: 14 Wall Street: 14 Wall Street, originally the Bankers Trust Company Building, is a skyscraper at 14 Wall Street at the corner of Nassau Street and running through to Pine Street in the Financial District of Manhattan in New York City. It sits across Nassau Street from Federal Hall National Memorial, across Wall Street from the New York Stock Exchange and diagonally across from the original headquarters of J. P. Morgan & Company. It was built in 1910-12 and was designed by Trowbridge & Livingston in the neoclassical style as the headquarters for Bankers Trust. An addition with Art Deco detailing, designed by Shreve, Lamb & Harmon, was constructed in 1931-33. The stepped pyramid at the building's top is a noted part of the downtown skyline, and became the logo for Bankers Trust, which sold the building in 1937.
Document 5: 270 Park Avenue: 270 Park Avenue (also known as the JPMorgan Chase Tower and formerly the Union Carbide Building) is a high-rise office building located in Midtown Manhattan, New York City. It was designed by Natalie de Blois for Skidmore, Owings & Merrill.
Document 6: Lever House: Lever House is a seminal glass-box skyscraper at 390 Park Avenue in Midtown Manhattan, New York City. Built in the International Style according to the design principles of Ludwig Mies van der Rohe, the building was designed by Gordon Bunshaft and Natalie de Blois (design coordinator) of Skidmore, Owings and Merrill. Completed in 1952, it was the second curtain wall skyscraper in New York City after the United Nations Secretariat Building. The 307 ft building features an innovative courtyard and public space.
Document 7: Time Warner Center: Time Warner Center is a mixed use (office/commercial and residential) twin-tower building in New York City. Developed by The Related Companies and AREA Property Partners (formerly known as Apollo Real Estate Advisors), its design by David Childs and Mustafa Kemal Abadan of Skidmore, Owings & Merrill, consists of two 750 ft twin towers bridged by a multi-story atrium containing upscale retail shops. Construction began in November 2000, following the demolition of the New York Coliseum, and a topping-out ceremony was held on February 27, 2003. The property had the highest-listed market value in New York City, $1.1 billion, in 2006. Originally constructed as the AOL Time Warner Center, the building encircles the western side of Columbus Circle and straddles the border between Midtown and the Upper West Side. The total floor area of 2.8 e6ft2 is occupied by office space (notably the offices of Time Warner and an R&D Center for VMware), residential condominiums, and the Mandarin Oriental, New York hotel. The Shops at Columbus Circle is an upscale shopping mall located in a curving arcade at the base of the building, with a large Whole Foods Market grocery store on the lower level.
Document 8: Former New York Life Insurance Company Building: The Former New York Life Insurance Company Building, also known as the Clock Tower Building, was built as an office building located at 346 Broadway (with a secondary address of 108 Leonard Street) between Catherine Lane and Leonard Street, in Manhattan, New York City. Constructed in two stages, from 1868 to 1870 and from 1894 to 1899, it is a New York City Landmark and is listed on the U.S. National Register of Historic Places.
Document 9: Chrysler Building: The Chrysler Building is an Art Deco-style skyscraper located on the East Side of Midtown Manhattan, at the intersection of 42nd Street and Lexington Avenue in the Turtle Bay neighborhood. At 318.9 m , the structure was the world's tallest building for 11 months before it was surpassed by the Empire State Building in 1931.
Document 10: MetLife Building: The MetLife Building is a 59-story skyscraper at 200 Park Avenue at East 45th Street above Grand Central Terminal in Midtown Manhattan, New York City. Built in 1960–63 as the Pan Am Building, the then-headquarters of Pan American World Airways, it was designed by Emery Roth & Sons, Pietro Belluschi and Walter Gropius in the International style. The world's largest commercial office space by square footage at its opening, it remains one of the 100 tallest buildings in the United States.
Document 11: Metropolitan Tower (Manhattan): The Metropolitan Tower is a 68-story, 716 ft (218 m) residential skyscraper in Manhattan, New York City, standing at 146 West 57th Street. The building has 235 apartment units.
Document 12: Seagram Building: The Seagram Building is a skyscraper, located at 375 Park Avenue, between 52nd Street and 53rd Street in Midtown Manhattan, New York City. The integral plaza, building, stone faced lobby and distinctive glass and bronze exterior were designed by German-American architect Ludwig Mies van der Rohe. Philip Johnson designed the interior of The Four Seasons and Brasserie restaurants. Severud Associates were the structural engineering consultants.
Document 13: 550 Madison Avenue: 550 Madison Avenue (formerly known as the Sony Tower or Sony Plaza and before that the AT&T Building), is an iconic postmodern 647 ft , 37-story highrise skyscraper located at 550 Madison Avenue in Manhattan. Designed by Philip Johnson, it was formerly the headquarters of Sony Corporation of America. The tower was purchased by the Olayan Group and Chelsfield for $1.4 billion in 2016.
Document 14: Metropolitan Life North Building: The Metropolitan Life North Building, now known as Eleven Madison, is a 30-story art deco skyscraper on Madison Square Park in Manhattan, New York City, at 11-25 Madison Avenue. The building is bordered by East 24th Street, Madison Avenue, East 25th Street and Park Avenue South, and is connected by an elevated walkway to the Met Life Tower just south of it. The North Building was built on the site of Richard Upjohn's original Madison Square Presbyterian Church. The second church, designed by Stanford White of McKim, Mead and White was built in 1906, across 24th street on land conveyed by Metropolitan Life. As part of the Metropolitan Life Home Office Complex, the North Building was added to the National Register of Historic Places on January 19, 1996.
Document 15: 2 Columbus Circle: 2 Columbus Circle is a 12-story building located on a small, trapezoidal lot on the south side of Columbus Circle on the Upper West Side of Manhattan, New York City. Bordered by 58th Street, 59th Street, Broadway, and Eighth Avenue, it stands on the site of the seven-story Grand Circle Hotel designed by William H. Cauvet. Opened in 1964 after A&P heir Huntington Hartford hired architect Edward Durell Stone to build a museum for him at the site. The building came under controversy in 2002 after the Museum of Arts and Design (MAD) was designated as the building's developer. MAD subsequently significantly altered its design, including modifying its facade; since 1996, ideas had been put forward for the building to be landmarked, so its proposed landmark status was brought into question with this renovation.
ground_truth: Napoleon LeBrun & Sons