Her family says Jeanne-Claude died Wednesday night at a New York hospital from complications of a brain aneurysm.
Mayor Michael Bloomberg said he spoke with Christo on Thursday morning and offered condolences on behalf of all New Yorkers.
In February 2005, Christo and Jeanne-Claude constructed more than 7,500 metal gates draped with orange fabric in Central Park. Officials estimated that the project brought in about 4 million visitors and generated $254 million.