Question: Were the buildings at 270 Park Avenue and 100 East 53rd Street both designed by Natalie de Blois?

full_context: Document 1: 277 Park Avenue: 277 Park Avenue is an office building in the Midtown Manhattan neighborhood of New York City. It stands on the east side of Park Avenue between East 47th and 48th Streets; it is 687 ft tall, with 50 floors.
Document 2: 126 Madison Avenue: 126 Madison Avenue (also known as 15 East 30th Street) is a proposed residential skyscraper under development by Fosun Property in NoMad, Manhattan, New York City. The building will rise 47 stories or 730 feet, and is expected to be completed by 2018. J.D. Carisle Development Corp. is co-developing the project with Fosun Group, and Handel Architects is designing. The developers are planned to begin construction in the second half of 2015.
Document 3: One57: One57, formerly known as Carnegie 57 and nicknamed "The Billionaire Building", is a 75-story (marketed as 90-story) supertall skyscraper at 157 West 57th Street between Sixth and Seventh Avenues in the Midtown neighborhood of Manhattan, New York City. Upon completion in 2014, it stood at 1,005 ft tall, making it the tallest residential building in the city for a few months until the completion of 432 Park Avenue. The building has 92 condominium units on top of a new Park Hyatt Hotel with 210 rooms, which is set to become the flagship Hyatt property.
Document 4: Madison Square Garden Towers: The Madison Square Garden Towers were the name of proposed twin 1400 ft residential skyscrapers that were to be constructed north of Madison Square Garden in Midtown Manhattan, New York City. The project featured a complex of seven buildings, including a stadium and a new Penn Station. The cost of the project was US$14 billion. The architects Norman Foster and David Childs, and the architectural firm Skidmore, Owings and Merrill were designing the project. The owners were Stephen Ross of Related Cos. and Steven Roth of Vornado Realty Trust. The towers would have risen to be two of the tallest structures in the Midtown Manhattan skyline, with one rising higher than the Empire State Building, currently one of New York's tallest buildings at 1,250 feet (381 m) and would also have been higher than the roof, though not the spire, of One World Trade Center. The towers are essentially canceled as Madison Square Garden is going ahead with renovations of the current arena, rather than a relocation that would have made the towers possible.
Document 5: 750 7th Avenue: 750 Seventh Avenue is a 615 ft (187m) tall Class-A office skyscraper in New York City. It was completed in 1989 in the postmodern style and has 36 floors. Kevin Roche John Dinkeloo & Associates designed the building, and it is owned by Hines, a Texas based real estate investment company. The building's continuous helix design, culminating in a chimney-like extension, was caused by the New York City Building Code, which requires setbacks. The 84 exterior column transfers exist because of the owner's requirement for a column-free space. It is tied with the New York Life Building for the 74th tallest building in New York City. It is also LEED certified.
Document 6: 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 7: 245 Park Avenue: 245 Park Avenue (formerly American Tobacco Company Building, American Brands Building and Bear Stearns Building) is a 648-ft (198 m) tall skyscraper in New York City, New York. It was completed in 1967 and has 48 floors (1.7 million square feet). Shreve, Lamb and Harmon designed the building. The Building Owners and Managers Association awarded the 2000/2001 Pinnacle Award to 245 Park Avenue. The site used to be occupied by the second Grand Central Palace exhibition hall, which was demolished in 1964 to make way for 245 Park Avenue.
Document 8: 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 9: Marine Midland Building: The Marine Midland Building (also HSBC Bank Building) is a 51-story office building located at 140 Broadway between Cedar and Liberty streets in Manhattan's financial district. The building, completed in 1967, is 688 ft (209.7 m) tall and is known for the distinctive sculpture at its entrance, Isamu Noguchi's "Cube". Gordon Bunshaft of Skidmore, Owings & Merrill, the man who designed the building, had originally proposed a monolith type sculpture, but it was deemed to be too expensive. It is currently owned by Union Investment.
Document 10: 252 East 57th Street: 252 East 57th Street is a mixed use modernist style residential skyscraper in New York City, United States developed by the World Wide Group and Rose Associates, Inc. Construction started in 2013, 252 East 57th Street is part of a surge of redevelopment of 57th Street into a luxury residential corridor that has been named "Billionaires’ Row." The residential tower will be 712 feet tall with condominiums starting on the 36th floor. The building will also include the construction of two new schools and 78,000 square feet of retail space, in addition to a Whole Foods Market. The residential tower and additional retail portions are anticipated to open in late 2016.
Document 11: 80 South Street: 80 South Street is a residential skyscraper proposed for construction in New York City. The building was planned for construction in Lower Manhattan, and designed by renowned Spanish architect Santiago Calatrava. However, the project was cancelled on April 16, 2008 in the wake of a declining real estate market. A new design of the building is without the spire, decreasing the tower to 826 feet, was planned to finish in 2016. China Oceanwide Holdings Limited acquired 80 South Street in March 2016, with plans to create a 113-story tower.
Document 12: 500 West 30th Street: 500 West 30th Street (also known as Abington House) is a residential building in Chelsea, in Manhattan, New York City just outside the Hudson Yards Redevelopment Project. There are 386 rental apartments at the building, located at the southwest corner of 30th Street and Tenth Avenue. Robert A.M. Stern Architects designed the building, and The Related Companies developed the building. There is about 7200 ft2 of rental space on the ground floor of the 33-story, 325 ft -tall building; the building also has a pre-fabricated red brick facade. The building, the first to open in the area under the zoning of the Hudson Yards Redevelopment Project, has 78 permanent units. It started leasing in April 2014, just two years after beginning construction in 2012.
Document 13: 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 14: 750 7th Avenue: 750 Seventh Avenue is a 615 ft (187m) tall Class-A office skyscraper in New York City. It was completed in 1989 in the postmodern style and has 36 floors. Kevin Roche John Dinkeloo & Associates designed the building, and it is owned by Hines, a Texas based real estate investment company. The building's continuous helix design, culminating in a chimney-like extension, was caused by the New York City Building Code, which requires setbacks. The 84 exterior column transfers exist because of the owner's requirement for a column-free space. It is tied with the New York Life Building for the 74th tallest building in New York City. It is also LEED certified.
Document 15: 100 East 53rd Street: 100 East 53rd Street (formerly known as 610 Lexington Avenue) is a residential skyscraper under construction in Midtown Manhattan, New York City. The building’s architect is Norman Foster. Upon completion, it will rise 64 stories or 711 ft . It was supposed to feature a Shangri-La Hotel and condos but as a result of the financial crisis that began in 2007 and the downturn in the residential real estate market, the building's construction was put on indefinite hold in 2009 and the hotel idea was later abandoned. In March 2012, Aby Rosen and Michael Fuchs of RFR Holding LLC regained control of the site, and announced their intentions to carry on with the project. Excavation work began in early 2014. The building topped out on January 13, 2016. It should be complete by spring 2017, according to a 2015 update. The building will feature 94 condominium units including, one-bedrooms, two-bedrooms, three-bedrooms, and two four bedroom duplexes.
ground_truth: no