Question: Which is taller The Steinway Tower or 126 Madison Avenue building, as planned?

Context paragraphs:
Squadron A Armory: The Squadron A Armory is a former United States Army armory and the homebase of Squadron A.  It took up the whole block between Madison Avenue and Park Avenue, between 94th and 95th Street.  It was therefore also known as the Madison Avenue Armory.  A surviving part of the building is listed on the National Register of Historic Places as Madison Avenue Facade of the Squadron A Armory and is a New York City landmark.

RSA Dexter Avenue Building: The RSA Dexter Avenue Building is a high rise building located in Montgomery, Alabama, United States.  The building is the third tallest building in the city, behind 60 Commerce Street and the RSA Tower.  It is home to offices and a state of the art data center.  The data center is approximately 42,000 sq ft and is built with a high degree of redundancy.  The building is owned by the Retirement Systems of Alabama.  The high rise was built around the former Alabama Judicial Building, while preserving much of the historic structure, such as the ceremonial courtroom as well as the overall architecture of the former building.  The restored portions of the former Judicial Building have been adapted for premium executive office space and a conference multi-purpose center which is the original Supreme Court chamber and lobby.  The building also has a unique external lighting system that is synchronized, often with other buildings in the downtown area.

550 Madison Avenue: 550 Madison Avenue (formerly known as the Sony Tower or Sony Plaza and before that the AT&T Building), is an iconic postmodern 647 ft , 37-story highrise skyscraper located at 550 Madison Avenue in Manhattan.  Designed by Philip Johnson, it was formerly the headquarters of Sony Corporation of America.  The tower was purchased by the Olayan Group and Chelsfield for $1.4 billion in 2016.

126 Madison Avenue: 126 Madison Avenue (also known as 15 East 30th Street) is a proposed residential skyscraper under development by Fosun Property in NoMad, Manhattan, New York City.  The building will rise 47 stories or 730 feet, and is expected to be completed by 2018.  J.D. Carisle Development Corp. is co-developing the project with Fosun Group, and Handel Architects is designing.  The developers are planned to begin construction in the second half of 2015.

Metropolitan Life Insurance Company Tower: The Metropolitan Life Insurance Company Tower, colloquially known as the Met Life Tower, is a landmark skyscraper located on Madison Avenue near the intersection with East 23rd Street, across from Madison Square Park in Manhattan, New York City.  Designed by the architectural firm of Napoleon LeBrun & Sons and built by the Hedden Construction Company, the tower is modeled after the Campanile in Venice, Italy.  The hotel located in the clock tower portion of the building has the address 5 Madison Avenue, while the office building covering the rest of the block, occupied primarily by Credit Suisse, is referred to as 1 Madison Avenue.

383 Madison Avenue: 383 Madison Avenue is an office building owned and occupied by JP Morgan Chase in New York City on a full block bound by Madison Avenue and Vanderbilt Avenue between East 46th and 47th Streets.  Formerly known as the Bear Stearns Building, it housed the world headquarters of the now-defunct Bear Stearns from the building's completion until Bear's collapse and sale to JPMorgan Chase in 2008.  The building now houses the New York offices for J.P. Morgan's investment banking division, which formerly occupied 277 Park Avenue.  Both 383 Madison and 277 Park are adjacent to JPMorgan Chase's world headquarters at 270 Park Avenue.

Metropolitan Life North Building: The Metropolitan Life North Building, now known as Eleven Madison, is a 30-story art deco skyscraper on Madison Square Park in Manhattan, New York City, at 11-25 Madison Avenue.  The building is bordered by East 24th Street, Madison Avenue, East 25th Street and Park Avenue South, and is connected by an elevated walkway to the Met Life Tower just south of it.  The North Building was built on the site of Richard Upjohn's original Madison Square Presbyterian Church.  The second church, designed by Stanford White of McKim, Mead and White was built in 1906, across 24th street on land conveyed by Metropolitan Life.  As part of the Metropolitan Life Home Office Complex, the North Building was added to the National Register of Historic Places on January 19, 1996.

The Steinway Tower: The Steinway Tower is a supertall residential project by developers JDS Development Group and Property Markets Group in midtown Manhattan in New York City.  Located at 111 West 57th Street, the development will be a combination of the original landmarked Steinway Building designed in 1925 by Warren & Wetmore, and a new tower addition on the adjacent site.  The building will rise to be 1438 ft .  The tower will become the most slender building in the world with a width-to-height ratio of about 1:23.

590 Madison Avenue: 590 Madison Avenue also known as the IBM Building, is a 603 ft tall skyscraper at the corner of East 57th Street and Madison Avenue in New York City, New York.  It was completed in 1983 and has 41 floors.  The building cost US$10 million, has 93592 m2 of floor area, has 24 elevators, and is the 89th tallest building in New York.  Edward Larrabee Barnes & Associates designed the building, and IBM developed it.  IBM sold the tower to Odyssey in 1994.  As of December 2007, 98% of the building is leased.

100 Park Avenue Building: The 100 Park Avenue Building, formerly known as the Medical Arts Building, is a skyscraper in downtown Oklahoma City.  The 100 Park Avenue Building has 12 stories and is 160 ft tall.  The building is constructed in the Art Deco style and was designed by Solomon Andrew Layton.  It opened in 1923, at which point it was the tallest building in Oklahoma City.

Supporting paragraphs: 126 Madison Avenue The Steinway Tower
Answer: The Steinway Tower