CityCenter, the country’s largest private development, is being sued by Perini Building Co., a unit of Tutor Perini Corp., Sylmar, Calif., over work disputes on the $8.5-billion, 18 million-sq-ft Las Vegas Strip complex of hotels, homes and entertainment. On March 25, Perini filed a lawsuit in Clark County Eighth Judicial District Court against several entities controlled by property owners—MGM Mirage Inc. and Infinity World Development Corp., both units of Dubai World, the investment arm of the Persian Gulf state—seeking $490 million for unpaid construction work on the hotel-casino. The 13-page complaint says the construction contract grew from $3.5 billion to
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.