Question: Milton Elting Hebald is an artist whose has 23 of his works displayed in public in New York City and at the Port Authority of New York and New Jersey, which is headquartered at what building?

<P0-S0> Milton Elting Hebald (May 24, 1917 – January 5, 2015) was a sculptor who specialized in figurative bronze works. <P0-S1>  Twenty-three of his works are displayed in public in New York City, including the statues of Romeo and Juliet and The Tempest in front of the Delacorte Theatre in Central Park. <P0-S2>  His major work is a 220 ft , 12-piece "Zodiac Screen", then the largest sculpture in the world, commissioned by Pan-American Airlines for its terminal at John F. Kennedy International Airport, and now owned and stored by the Port Authority of New York and New Jersey. <SEP> <P1-S0> NY Waterway, or New York Waterway, is a private transportation company running ferry and bus service in the Port of New York and New Jersey and in the Hudson Valley. <P1-S1>  While operations and much marketing come under the NY Waterway logo, the company works with other private companies and in public-private partnership with agencies such as the Port Authority of New York and New Jersey, New Jersey Transit, New York City Department of Transportation, and Metropolitan Transportation Authority, to provide service and maintain docking facilities. <SEP> <P2-S0>  The Port Authority is headquartered at 4 World Trade Center and is a member of the Real Estate Board of New York. <P2-S1> The Port Authority of New York and New Jersey (PANYNJ) is a joint venture between the U.S. states of New York and New Jersey, established in 1921 through an interstate compact authorized by the United States Congress. <P2-S2>  The Port Authority oversees much of the regional transportation infrastructure, including bridges, tunnels, airports, and seaports, within the geographical jurisdiction of the Port of New York and New Jersey. <P2-S3>  This 1,500 mi2 port district is generally encompassed within a 25 mi radius of the Statue of Liberty National Monument. <SEP> <P3-S0> Kenneth Lipper is a prominent figure in the arts, the world of finance, and government. <P3-S1>  He served as New York City’s Deputy Mayor under Mayor Ed Koch. <P3-S2>  Mr. Lipper was a General Partner at Lehman Brothers and Salomon Brothers, serving as the investment banker for some of the leading public corporations in the United States and Europe. <P3-S3>  He was Adjunct Professor at Columbia School of International Affairs in the field of international economics. <P3-S4>  Mr. Lipper serves as a director of corporations and government agencies. <P3-S5>  He is Chairman of Lipper & Co, an investment bank and investment management company, and also serves as Chairman of the Board of Lippmann Enterprises LLC, a cosmetics company. <P3-S6>  In November 2010, after winning a civil class action, Lipper was awarded more than $15 million in indemnification, because as a New York State Supreme Court judge’s findings noted, "none of the investigations and claims asserted against [Lipper] had resulted in a finding that he had engaged in 'negligence, malfeasance or a violation of applicable law.'" <P3-S7>  In 2013, Governor Andrew Cuomo nominated, and the New York State Senate confirmed, Kenneth Lipper as a member of the Board of Commissioners of the Port Authority of New York and New Jersey, the Port Authority’s governing body. <P3-S8>  The Port Authority is a congressionally created bi-state agency which owns and operates JFK International, LaGuardia, and Newark International airports, the bridges and tunnels, PATH railroad, ports and terminals and the World Trade Center. <P3-S9>  Mr. Lipper won an Academy Award in 1998 for producing the best feature-length documentary. <P3-S10>  He is author of the novels Wall Street and City Hall and wrote the original screenplay for the feature film "City Hall." <P3-S11>  Mr. Lipper was Producer of the feature films: "City Hall", "The Winter Guest" and "The Last Days," as well as Chief Technical Adviser of "Wall Street." <P3-S12>  He is the co-founder and co-publisher of Lipper Viking Penguin, a celebrated biography series which has published 24 books in multiple languages and countries.