Atlantic City's surviving casinos are showing signs of strength, according to a new Stockton University study.

Parking fees per space in the city's eight casinos were up in double digits from the year-earlier period in April, May and June, according to the 2015 second-quarter report from Stockton's Lloyd D. Levenson Institute of Gaming, Hospitality & Tourism. Lodging fees collected at the casinos also rose between 6% and 8% in those same months.

Revenue collected at non-casino Atlantic City hotels dropped 3% in April compared to the previous year, according to the Stockton research. However, these hotels then recovered the next two months with a 1% jump in May and 5% rise in June.

Atlantic City suffered four casino closures in 2014 including Atlantic Club, Showboat, Revel and Trump Plaza. The struggling New Jersey city has been under emergency manager control since late January and is rated Caa1 by Moody's Investors Service and B by Standard & Poor's.

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