The New Museum is joining the long list of New York art institutions looking to expand. The museum is launching an $80m capital campaign to mark its 40th anniversary and the 10th anniversary of its towering white building on the Bowery next year. The museum has already raised $43m from board members including Toby Devan Lewis. The institution, which began in 1977 as a one-room operation and does not have a collection, plans to renovate an adjacent property to add space for offices and programmes. The addition will allow the museum to double its exhibition space and improve circulation in the often-crowded stairwells.