www . cosmopolitanlasvegas . com Located in Las Vegas , the Cosmopolitan Casino and Hotel had a construction cost of approximately $ 4.14bn , according to Express . Famous for its multi-storey chandelier , its construction was originally announced in 2004 , as a result of a partnership between Bruce Eichner , a real-estate developer , and David Freidman . The Las Vegas Sun reported that Arquitectonica was the project architect , allowing Paul Duesing Partners to focus on the interior design , Douglas Design to focus on interior design and retail , and The Friedmutter Group to take over the hotel-casino design . It opened its doors to the public in late 2010 , according to Forbes . Ownership of the hotel bounced between owners during and after its construction . According to Forbes , Deutsche Bank took over in 2008 , but eventually sold to the Blackstone Group for $ 1.73bn in 2014 . According to Vegas Inc ., it is the most expensive resort on the Las Vegas Strip .

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