Question: Which building is planned for the future - 888 7th Avenue or 50 Hudson Yards?

Context paragraphs:
Hounsfield Heights/Briar Hill, Calgary: Hounsfield Heights/Briar Hill is an inner suburban neighbourhood in northwest Calgary, Alberta, Canada.  Located north of the Hillhurst and West Hillhurst communities, the boundaries of the district are 16th Avenue N (Trans-Canada Highway)to the north; 14th Street W to the east; Lane north of 7th Avenue N to 19th Street W and 8th Avenue N to the south; and Crowchild Trail, 12th Avenue N, Juniper Road, and 22nd Street W to the west.  Lions Park C-Train station is located within the community.  The community is built on an escarpment and is popular for its views of downtown to the south and the Rocky Mountains to the west.

South Phoenix: South Phoenix is a region of Phoenix, Arizona, with the boundaries of the Gila River Indian Community to the south and west, 48th Street or Interstate-10 (Phoenix/Tempe and Phoenix/Chandler borders) to the east, and the Salt River to the north.  This area includes Phoenix's following Urban Villages: South Mountain Village (aka South Mountain District) along with Laveen Village and Ahwatukee Village.  The area is sometimes simply referred to as "the Southside" by its residents.  Major arterial east-west streets include Broadway Road, Southern Avenue, Baseline Road, Dobbins Road, Elliott Road, Warner Road, Chandler Boulevard, and Pecos Road, most of which connect South Phoenix with the suburbs of Tempe and Chandler.  Major arterial south-north streets include 24th Street, 16th Street, 7th Street, Central Avenue, 7th Avenue, and 19th Avenue connecting South Mountain Village to Central and North Phoenix; 27th Avenue, 35th Avenue, 43rd Avenue, 51st Avenue, 59th Avenue, 67th Avenue, and 75th Avenue connecting Laveen to west Phoenix; and 32nd Street, 40th Street, and 48th Street connecting South Mountain Village to east Phoenix and Tempe.

888 7th Avenue: 888 7th Avenue is a 628 ft (191m) tall modern-style office skyscraper in Midtown Manhattan which was completed in 1969 and has 46 floors.  Emery Roth & Sons designed the building, which is tied with Central Park Place for the 65th tallest building in New York City.  It currently carries the Vornado Realty Trust corporate headquarters.  Previously known as the Arlen Building, its namesake being the company responsible for its construction, Arlen Realty & Development Corporation.  The Red Eye Grill is located in the building at street level.

50 Hudson Yards: 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.

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.

55 Hudson Yards: 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.

Hudson Yards, Manhattan: Hudson Yards is a large-scale redevelopment program that is planned, funded and constructed under a set of agreements among the City of New York, the State of New York, and the Metropolitan Transportation Authority, with the aim of expanding the Midtown Manhattan Business District westward to the Hudson River.  The program includes a major rezoning of the Far West Side, an extension of the New York City Subway's trains to a new subway station at 34th Street and 11th Avenue, a renovation and expansion of the Jacob K. Javits Convention Center, and a financing plan to fund the various components.

35 Hudson Yards: 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.

Pershing Square Capital Management: Pershing Square Capital Management is an American hedge fund management company founded and run by Bill Ackman, located at 888 7th Avenue in New York.

7 Subway Extension: 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.

Supporting paragraphs: 888 7th Avenue 50 Hudson Yards
Answer: 50 Hudson Yards