Hotels have long catered to business travelers, and for good reason. According to a U.S. Travel Association report, direct spending by domestic and international business travelers in the U.S. totaled $266.5 billion in 2013, representing almost a third of all money spent by travelers in the country that year. Considering this amount and the frequency with which these individuals travel -- an average of 21 to 30 times per year, according to a report from American Express Global Business Travel -- hotels need to promise more than just a business center to appease this discerning group of frequent travelers.

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