Prosecutors say a Harlem real estate hustler tried to sell a prime property he didn’t own to the group that oversees the New York City Marathon, and the organization spent $300,000 in fees before the deal unraveled.

Henry Vargas was being held without bail after pleading not guilty Wednesday to charges including grand larceny.

Prosecutors say the 35-year-old Vargas forged documents showing he had a 60-percent stake in a commercial building near Central Park.

They say he pocketed $1 million from a developer for an option to buy the supposed 60-percent share — and then agreed to sell the property to New York Road Runners for $8.5 million.

Spokesman Richard Finn says the group is seeking another spot for a planned running center.