Question: Which building is still under construction, 30 Hudson Yards or the New York World Building?

Context paragraphs:
30 Hudson Yards: 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.

Vessel (structure): 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.

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.

15 Hudson Yards: 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.

101 Hudson Street: 101 Hudson Street, also known as the Merrill Lynch Building, in the Exchange Place neighborhood of Jersey City, New Jersey, is the second-tallest building in Jersey City, and the third-tallest in the state of New Jersey.  Completed in 1992, it has 42 stories, and reaches a height of 167 m (548 ft).  It was the second tallest building in New Jersey after the Trump Taj Mahal until the Goldman Sachs Tower (30 Hudson Street) was completed in 2004.  The building was designed by Brennan Beer Gorman / Architects LLP.  Merrill Lynch & Co., Inc. and AIG are among the tenants.

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.

3 Hudson Boulevard: 3 Hudson Boulevard, previously tentatively known as the GiraSole, is a supertall skyscraper under construction in Manhattan's Hudson Yards and Hell's Kitchen neighborhoods along the Hudson Park and Boulevard in New York City.  Its developer is Joseph Moinian.

New York World Building: "The New York World" Building was a skyscraper in New York City designed by early skyscraper specialist George Browne Post and built in 1890 to house the now-defunct newspaper, "The New York World".  It was razed in 1955.

Hudson Park and Boulevard: Hudson Park and Boulevard is a greenway and boulevard in Hell's Kitchen, Manhattan in New York City, being built as part of the Hudson Yards Redevelopment Project.  It lies between 10th and 11th Avenues.  When complete, it will be 4 acre , six-block-long north-south, and run between 33rd and 39th Streets.  The boulevard will be in the center of the park when complete.  Construction will be in two phases; the first phase, located between 33rd and 36th Streets, was under construction from 2012 to August 2015.  The second phase has no timeline.  The total cost of the project is more than $30 million.

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.

Supporting paragraphs: 30 Hudson Yards New York World Building
Answer: 30 Hudson Yards