A Manhattan judge has dismissed the charges against a real-estate broker accused of serving alcohol to a US ambassador’s underage daughter who fell to her death at his party last summer.

Nicole John, 17, had been drinking prior to the party at Ilan Nassimi’s Herald Square apartment, prosecutors explained yesterday in asking that the misdemeanor charges of serving alcohol to minors be tossed.

An investigation into the death of John — daughter of then-US ambassador to Thailand Eric John — yielded no solid proof that Nassimi served booze to minors, prosecutors said.

Nassimi declined to comment as he left court. He had faced up to a year jail if convicted.

John had been drinking at Meatpacking District nightclub Tenjune before hitting Nassimi’s party, cops said.

She’d climbed out onto a ledge at 4:14 a.m. at Nassimi’s 25th-story apartment, apparently to take a picture of the Empire State Building.