The National Capital Commission (NCC) maintains the house, its property, and a selection of historic furnishings from the Crown Collection for use in the public rooms of the mansion, ranging from musical instruments to chairs, tables, and paintings by famous Canadians. However, due to the lack of restraints on the prime minister of the day to do what he or she pleases with the home, several have left their own marks on the building. For example, the rear patio was enclosed and winterised while Lester B. Pearson was prime minister and inside, Pearson's wife, Maryon, created in the basement the "Canadiana Room", where she collected Canadian antiques and craft-work. While Joe Clark and his family were resident at 24 Sussex, the interiors were redecorated, the dining room ceiling receiving gold leaf re-purposed from another project and unnamed business associates of Pierre Trudeau installed a swimming pool for his frequent workouts. The pool, designed by government architect Stig Harvor, reportedly cost C$275,000 due to an underground access increasing the expense. This was raised in a "public fund" headed by Keith Davey, the donors to which were never made public. Brian Mulroney was the first prime minister to have the costs of renovations publicly revealed. The high tab for his and his wife's alterations to the building caused political controversy, especially as some of the costs were paid for from the PC Canada Fund, which raised money from individual donations to fund the Progressive Conservative Party.