Moroccan riad been bought by foreigners. This foreign interest has brought new challenges but the investment has helped with the restoration of the UNESCO site and has helped revive many of the handcrafts and artisan trades that were gradually being lost before this trend. Many of the restored riads in the districts of Mouassine and Lakssour offer the finest examples of restoration as historically these areas contained many of the grand palaces from Marrakech's Saadian period. Moroccan riad A riad () is a type of traditional Moroccan house or palace with an interior garden or courtyard. The word riad originates from the
Winter Garden Atrium cost of $60 million, the Atrium was originally connected to the World Trade Center via a pedestrian bridge that spanned West Street. The Atrium was severely damaged in the September 11, 2001 attacks as almost all the glass panes were blown out by the dust clouds and debris caused by the collapse of the Twin Towers, but was rebuilt during the first year of the Financial Center's recovery. Reconstruction of the Winter Garden required 2,000 panes of glass, 60,000 square feet (5,400 m²) of marble flooring and stairs, and sixteen Washingtonia robusta palm trees at a cost of $50 million.