a ceremony to mark the beginning of construction. The park was designed by James Corner's New York-based landscape architecture firm Field Operations and architects Diller Scofidio + Renfro, with garden design by Piet Oudolf of the Netherlands, lighting design from L'Observatoire International, and engineering design by Buro Happold and Robert Silman Associates. New York City Department of City Planning director and city planning commission chair Amanda Burden contributed to the project's development. Major supporters included Philip Falcone, Diane von Fürstenberg, Barry Diller, and von Fürstenberg's children Alexander and Tatiana von Fürstenberg. Hotel developer Andre Balazs, owner of the Chateau Marmont in Los Angeles, built the 337-room Standard Hotel straddling the High Line at West 13th Street. The southernmost section, from Gansevoort Street to 20th Street, opened as a city park on June 8, 2009. The section includes five stairways and elevators at 14th Street and 16th Street. Around the same time, construction of the second section began. A ribbon-cutting ceremony was held on June 7, 2011, to open the second section (from 20th Street to 30th Street), with Mayor Michael Bloomberg, New York City Council speaker Christine Quinn, Manhattan Borough President Scott Stringer and Congressman Jerrold Nadler in attendance. CSX Transportation, owner of the northernmost section from 30th to 34th Streets, agreed in principle to donate the section to the city in 2011; the Related Companies, which owns development rights for the West Side Rail Yards, agreed not to tear down the spur crossing 10th Avenue. Construction on the final section was started in September 2012. A ribbon-cutting ceremony for the High Line's third phase was held on September 20, 2014, followed the next day by the opening of its third section and a procession down the park. The third phase, costing $76 million, was divided into two parts. The first part (costing $75 million) is from the end of phase 2 of the line to its terminus at 34th Street, west of 11th Avenue. The second part, a spur above Tenth Avenue and 30th Street, has room to install artworks curated by the public art program. The spur was scheduled to open by 2018, but was then delayed to April 2019, and later to June 2019. It opened on June 4, 2019, with the installation of a plinth as its initial artwork. It contains entrances to 10 Hudson Yards, built above the spur. Subsequent developments The High Line closed