The Broadway–Chambers Building, located at 277 Broadway on the northwest corner of Chambers Street in the Civic Center / TriBeCa neighborhood of Manhattan, New York City, was constructed from 1899 to 1900, and was architect Cass Gilbert's first design in the city.
 The 18-story office building is designed in the Beaux-Arts style.
Abraham M. Radcliffe (1827–1886) was an architect born in New York City.
 He opened a Minneapolis office in 1857 and a St. Paul office in 1858.
 He closed his Minneapolis office in 1868.
 He designed early commercial buildings in St. Paul and Minneapolis, as well as the Dakota County Courthouse in Hastings, Minnesota.
 Radcliffe inspired the architectural career of Cass Gilbert, the skyscraper pioneer who designed the Woolworth Building in New York City and the United States Supreme Court building, among many important public structures.
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.
Gunvald Aus, also written Aas (May 30, 1851 – May 27, 1950) was a Norwegian-American engineer.
 He is most associated with the engineering of the Woolworth Building in New York City.
The R.C. Williams Warehouse is a Modern Movement style building in New York City designed by noted architect Cass Gilbert.
 It was built on the west side of 10th Avenue between 25th and 26th Streets, for a wholesale grocery company, the R.C. Williams Company, which began in 1809.
 The design is a smaller version of Gilbert's design for the U.S. Army Military Ocean Terminal.
The Woolworth Building, at 233 Broadway, Manhattan, New York City, designed by architect Cass Gilbert and constructed between 1910 and 1912, is an early US skyscraper.
 The original site for the building was purchased by F. W. Woolworth and his real estate agent Edward J. Hogan by April 15, 1910, from the Trenor Luther Park Estate and other owners for $1.65 million.
 By January 18, 1911, Woolworth and Hogan had acquired the final site for the project, totaling $4.5 million.
 More than a century after its construction, it remains, at 241.4 m , one of the 100 tallest buildings in the United States as well as one of the 30 tallest buildings in New York City.
 It has been a National Historic Landmark since 1966, and a New York City landmark since 1983.
The Thurgood Marshall United States Courthouse is a Classical Revival courthouse located at 40 Centre Street on Foley Square in the Civic Center neighborhood of lower Manhattan in New York City.
 The building, designed by Cass Gilbert and his son, Cass Gilbert, Jr., is listed on the National Register of Historic Places as U.S. Courthouse.
The New York County Lawyers' Association Building at 14 Vesey Street between Broadway and Church Street in the Financial District of Manhattan, New York City was built in 1929-30 and was designed by noted architect Cass Gilbert in the English Georgian style for the Association, which was founded in 1908.
 Gilbert's design complements Trinity Church's St. Paul's Chapel, which sits across the street.
90 West Street (alternatively West Street Building) is a building in Lower Manhattan, New York City.
 It was designed by architect Cass Gilbert and structural engineer Gunvald Aus for the West Street Improvement Corporation.
 When completed in 1907, the building's Gothic styling and ornamentation served to emphasize its 23-story height, and foreshadowed Gilbert's later work on the Woolworth Building.
 Originally built as an office building, the main tenant was the Delaware, Lackawanna and Western Railroad and the top floor was occupied by Garret's Restaurant, which advertised itself as the "world's highest restaurant".
Westchester Avenue is a former railroad station located in the borough of the Bronx in New York City, partially suspended over Amtrak's busy Northeast Corridor line.
 It was built in 1908 with rich terra cotta detailing to a design by Cass Gilbert, who would later employ similar terra cotta detailing in his 1910 design for the Woolworth Building.
 Train service to the station ceased in 1937, and as of 2014 the station was a ruin in poor condition.

Question: WHAT NEW YORK CITY BUILDING DID GUNVALD AUS AND CASS GILBERT WORK ON TOGETHER?
Answer: Woolworth Building