The 7 Subway Extension is a subway extension of the New York City Subway's IRT Flushing Line.
 The extension stretches 1 mi southwest from its previous terminus at Times Square, at Seventh Avenue and 41st Street, to one new station at 34th Street and Eleventh Avenue.
 A second station at 10th Avenue and 41st Street was dropped from the plans in October 2007.
 The entirety of the extension is located within the New York City borough of Manhattan and is served by the 7 local and <7> express services.
 The extension, a key part of the Hudson Yards Redevelopment Project, is expected to bring business and entertainment into the area, as well as aid redevelopment of nearby Chelsea and Hell's Kitchen, located around the Long Island Rail Road's West Side Yard.
 The extension also serves the nearby Jacob K. Javits Convention Center.
30 Hudson Yards (also the North Tower) is a super tall office building currently under construction in the West Side area of Manhattan.
 Located near Hell's Kitchen, Chelsea and the Penn Station area, the building is a part of the Hudson Yards Redevelopment Project, a plan to redevelop the Metropolitan Transportation Authority's West Side Yards.
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.
55 Hudson Yards (also known as One Hudson Yards or One Hudson Boulevard) is a future tower just outside the Hudson Yards Redevelopment Project.
 Located in Chelsea, Manhattan, it will add a combined 4000000 sqft of space to the Hudson Yards project, along with 50 Hudson Yards, even though the two buildings will be located outside of the redevelopment site itself.
Vessel is a public structure and landmark that is under construction as part of the Hudson Yards redevelopment project in the Manhattan borough of New York City.
 The elaborate honeycomb-like structure is designed to rise 16 stories and consist of 154 flights of stairs, 2,500 steps, and 80 landings.
 When complete, visitors would be able to climb the installation.
 Designed by the British architect Thomas Heatherwick, "Vessel" is intended to be the main feature of the 5 acre Hudson Yards Public Square once the structure is completed in 2018 at a cost of $150 million to $200 million.
15 Hudson Yards is a residential building currently under construction on Manhattan's West Side.
 Located in Chelsea near Hell's Kitchen Penn Station area, the building is a part of the Hudson Yards project, a plan to redevelop the Metropolitan Transportation Authority's West Side Yards.
 The tower started construction on December 4, 2014.
50 Hudson Yards is a building being planned as part of the Hudson Yards Redevelopment Project in Hell's Kitchen, Manhattan.
 The planned building is to be located to the north of 30 Hudson Yards, and on the east side of the Hudson Park and Boulevard, adjacent to 55 Hudson Yards.
 It will total 2.9 million square feet of commercial space.
 At the SW corner of 34th Street and 10th Avenue, it will replace the drive-thru McDonald's that had long-occupied the space.
10 Hudson Yards is an office building that was completed in 2016 in Manhattan's West Side.
 Located near Hell's Kitchen, Chelsea and the Penn Station area, the building is a part of the Hudson Yards urban renewal project, a plan to redevelop the Metropolitan Transportation Authority's West Side Yard.
 Coach, Inc. is the anchor tenant.
 During planning, the tower was known as the South Tower or Tower C.
35 Hudson Yards (also Tower E or Equinox Tower) is a mixed-use building currently under construction in Manhattan's West Side and is slated to be composed of apartment units and a hotel.
 Located near Hell's Kitchen, Chelsea, and the Penn Station area, the building is a part of the Hudson Yards project, a plan to redevelop the Metropolitan Transportation Authority's West Side Yards.
Chelsea is a neighborhood on the West Side of the borough of Manhattan in New York City.
 The district's boundaries are roughly 14th Street to the south and the Hudson River and West Street to the west, with the northern boundary variously described as 30th Street or 34th Street, and the eastern boundary as either Sixth Avenue or Fifth Avenue.
 To the north of Chelsea is the neighborhood of Hell's Kitchen, as well as the Hudson Yards; to the northeast is the Garment District; to the east are NoMad and the Flatiron District; to the southwest is the Meatpacking District; and to the south and southeast are the West Village and the remainder of Greenwich Village.

Question: What borough are the neighborhood of Chelsea and the office building, 10 Hudson yards, both a part of?
Answer: Manhattan