What American Thoroughbred horse race facility in Elmont, New York opened on May 4, 1905 and has a $500,000 purse starting in 2016?
Belmont Park: Belmont Park is a major Thoroughbred horse-racing facility located in Elmont, New York, just outside New York City limits. Belmont Park:  It first opened on May 4, 1905.
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