Moroccan architecture for building standards which directly affected the architecture at that time, as follows: The building regulations maintained the country's preexisting architectural features and balanced the rapid urbanization. The Riad also known as Dar is the Moroccan traditional house, which normally has two or more storeys around a courtyard. Villas are larger stand-alone housing in the urbanized area which do not need to follow traditional architectural style. Arches, most often the horseshoe arch are used in almost every aspect of Moroccan housing whether it is doors, entrances, windows or niches. Domes are often integrated with altars or commemorative monuments as well
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.