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

Context articles: Park Avenue Tunnel (roadway)
Harold Washington Park
Seventh Avenue (IND Queens Boulevard Line)
Lever House
Lipstick Building
53rd Street Library
Church of St. Ignatius Loyola (New York City)
100 East 53rd Street
270 Park Avenue
Paley Park

The Park Avenue Tunnel, also called the Murray Hill Tunnel, is a 1600 ft tunnel that passes under seven blocks of Park Avenue in Murray Hill, in the New York City borough of Manhattan.
 Traffic currently goes northbound from 33rd Street toward the Park Avenue Viaduct.
 The tunnel is under the jurisdiction of the New York City Department of Transportation, and carries one lane of northbound car traffic from East 33rd Street to East 40th Street; from 40th Street north, traffic must follow the Park Avenue Viaduct around Grand Central Terminal to 46th Street.
 The vertical clearance is 8 ft .
Harold Washington Park is a small (10 acre) park in the Chicago Park District located in the Hyde Park community area on the South Side of Chicago, Illinois, USA.
 It was recently named for lawyer, state legislator, U.S. congressman, Hyde Park resident, and the first Chicago Mayor of African-American descent Harold Washington (1922–1987).
 The Park District officially calls the park Harold Washington Playlot Park with a designated address of 5200 S. Hyde Park Blvd Chicago, IL 60615.
 It is one of 4 Chicago Park District parks named after persons surnamed Washington (Washington Park, Washington Square Park, Dinah Washington Park).
 It is one of 40 Chicago Park District parks named after influential African Americans.
 The Park is bounded by East 53rd Street on the south, South Hyde Park Boulevard on the west, and Lake Shore Drive to the east.
 Architecturally, it is flanked to the north by Regents Park (see emporis.com page) and The Hampton House to the south.
 In addition its southwest corner opposes two National Register of Historic Places Properties (Hotel Del Prado and East Park Towers).
Seventh Avenue is a station on the IND Sixth Avenue Line and the IND Queens Boulevard Line of the New York City Subway.
 Located at the intersection of Seventh Avenue and 53rd Street in Manhattan, it is served by the D and E trains at all times, and the B train weekdays.
 The station is announced as Seventh Avenue–53rd Street, in the style of other stations that orient east-west along 53rd Street (such as Fifth Avenue/53rd Street and Lexington Avenue–53rd Street), as well as to prevent confusion with Seventh Avenue along Flatbush Avenue in Brooklyn, which is also served by the B.
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.
The Lipstick Building (also known as 53rd at Third) is a 453-foot (138 meter) tall skyscraper located at 885 Third Avenue, between East 53rd Street and 54th Street, across from the Citigroup Center in Manhattan, New York City, United States.
 It was completed in 1986 and has 34 floors.
 The building was designed by John Burgee Architects with Philip Johnson.
 The building receives its name from its shape and color, which resemble a tube of lipstick.
The 53rd Street Library is a branch of the New York Public Library at 18 West 53rd Street just across the street from the Museum of Modern Art.
 It opened in 2016 as a replacement for the Donnell Library Center, which occupied a building at 20 West 53rd Street from 1955 until 2008 when it was closed and the building razed to allow a 46-story hotel/condo complex to be constructed.
The Church of St. Ignatius of Loyola is a Roman Catholic parish church located on the Upper East Side of Manhattan, New York City, administered by the Society of Jesus (Jesuits).
 The parish is under the authority of the Archdiocese of New York, and was established in 1851 as St. Lawrence O'Toole's Church.
 In 1898, permission to change the patron saint of the parish from St. Lawrence O’Toole to St. Ignatius of Loyola was granted by Rome.
 The address is 980 Park Avenue, New York City, New York 10028.
 The church on the southwest corner of Park Avenue and 84th Street is part of a Jesuit complex on the block that includes Wallace Hall, the parish hall, beneath the church, the rectory at the midblock location on Park Avenue, the grade school of St. Ignatius's School on the north midblock location of 84th Street behind the church and the high school of Loyola School (also 980 Park Avenue) at the northwest corner of Park Avenue and 83rd Street.
 In addition, another Jesuit high school, Regis High School (55 E 84th Street), occupies the midblock location on the north side of 84th Street.
 The church was added to the National Register of Historic Places on July 24, 1980.
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.
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.
Paley Park is a pocket park located at 3 East 53rd Street between Madison and Fifth Avenue in Midtown Manhattan on the former site of the Stork Club.
 Designed by the landscape architectural firm of Zion Breen Richardson Associates, it opened May 23, 1967.
 Paley Park is often cited as one of the finest urban spaces in the United States.