Concrete reinforcing has experienced the most significant cost increase at 6.4% over the past year, while precast concrete had a 5.7% decline during the same period. Overall, construction costs in the U.S. have increased 1.7% in the past year -- the first significant increase since mid-2008, according to RSMeans' 30-City index. New York City, San Francisco, Honolulu, Boston and Oakland, Calif., are among the most expensive cities to build in.

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