Investing at record levels, owners of hotels across the United States are doing everything from rewiring their rooms and buying smart TVs, to replacing bathtubs with more easily maintained walk-in showers. These represent some of the latest capital expenditures by American hotel owners identified in a new survey by Bjorn Hanson, a professor at the Tisch Center for Hospitality and Tourism at New York University, who estimates that this spending will climb to $6.4 billion this year, up 7 percent over last year.

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