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Cosmopolitan Resort CasinoThe $3.9 billion Cosmopolitan of Las Vegas has started accepting room reservations for a Dec. 15 opening, hotel officials said Wednesday.

The company said  that it planned to spend $1.1 billion during the last nine months of 2010 to finish the 2,995-room casino-resort on the Las Vegas Strip.

The two-tower resort will open without 987 of its rooms, with most of them opening incrementally through July next year. Cosmopolitan CEO John Unwin has said the delay will give more time to finish interior work and move furniture.

The 8.7-acre development is expected to be the last new Strip casino for at least a few years. Other projects, including the Carl Icahn-owned Fontainebleau Las Vegas and Boyd Gaming Corp.’s Echelon, are on hold indefinitely as their owners wait for more favorable market conditions.

Operators have lowered room rates in Las Vegas as they fight to attract tourists to existing casinos.