One High Line (formerly The XI and The Eleventh) is a pair of buildings in New York City designed by architectural firm BIG.

[6] A consortium of lenders including JPMorgan Chase, BlackRock and SL Green provided $1 billion in acquisition and predevelopment financing at the time.

[15] Graeme Hart, the second richest person in New Zealand, reportedly bought a five bedroom, 5,783 square feet (537.3 m2) penthouse for $34 million.

The space between the two buildings serves as a porte-cochère and courtyard with plantings, designed by the Swiss landscape architect Enzo Enea.

[18] Amenities for condo owners include the "XI Club" which contains a 4,000 square feet (370 m2) fitness center with a 75 feet (23 m) pool, a lounge and gallery in the glass bridge, a wine tasting room, a social lounge with billiards tables, a teen room and a children’s playroom.

[20][21] According to the architect, the façade design is inspired by the punched windows of the Meatpacking District's historic warehouses as well as the architecture of the surrounding West Chelsea neighborhood.

Reviewers have compared the complex's design to Santiago Calatrava's award-winning Turning Torso project in Malmö, Sweden as well as Rafael Viñoly's 432 Park Avenue.