[5] Alexico Group's Izak Senbahar purchased the land and the air rights in 2007 from the New York Law School for US$150 million.

[6] Foundation work on this tower began in 2008, but was shut down before the end of the year when the project was put on hold.

[9] In June 2013, a penthouse at 56 Leonard went into contract for US$47 million, making it the most expensive residential property ever sold below Midtown Manhattan.

[11][12][13] 56 Leonard is designed by the 2001 Pritzker Prize-winning Swiss architecture firm Herzog & de Meuron.

[16] In February 2023, an Anish Kapoor sculpture, superficially similar to his Cloud Gate work, was unveiled at the ground level, following four years of on-site construction and delays.