The Dia Art Foundation, which closed its two galleries in Manhattan in 2004, has gathered about half the money needed to build its new space in New York City’s Chelsea neighborhood. While the organization has pushed their fundraising efforts into high gear, they are left without an acquisition fund for its collection, which includes works from the 1960s to the present.

The Dia Art Foundation announced that they will be holding a sale of paintings and sculptures at Sotheby’s in New York on November 13-14, 2013 to remedy that. The foundation hopes to raise at least $20 million by auctioning off works by Cy Twombly (1928-2011), John Chamberlain (1927-2011) and Barnett Newman (1905-1970).

The Dia Art Foundation’s collection includes works by modern and contemporary artists such as Andy Warhol (1921-1987), Joseph Beuys (1921-1986) and Louise Bourgeois (1911-2010). Philippe Vergne, the Dia’s director, has not commented on what works he’s hoping to acquired with the funds from the Sotheby’s sale.