The daughter of real estate magnate Peter Kalikow was busted by undercover cops for possessing a “large quantity” of heroin on Craigslist in the Bronx Sunday night, according to police sources and court records.

Kathryn Kalikow, 27, was arrested for drug possession along with boyfriend Brian Whalen at 9:30 p.m. on Hoffman Street, sources said. The pair were allegedly found with a 30 bags of heroin after advertising the goods on Craigslist.

“High quality diesel pain relief available. Discreet & professional. No games; will only reply to likeminded individuals. Email name and number for response. Stamps, diesel, H train, dope, bundles, tickets, dog food,” the ad read, using coded words for heroin, according to a criminal complaint.

The ad caught the eye of an undercover officer who arranged to buy drugs from the pair near Fordham University, according to a criminal complaint.

The duo met the undercover cop outside an apartment building on Hoffman Street in a blue Volkswagon, the complaint states.

Both got out, walked to a nearby restaurant, and then Whalen returned to the car, the complaint states.

The undercover cop then got a text message that read, “I’m in front of the building in a Volkswagon,” the complaint states.

The cop went up to Whalen, who said, “I’m meeting someone here, but I don’t have anything,” according to the complaint.

Another undercover cop went up to Kalikow, whose father once owned the New York Post, and asked her if she had any drugs on her – she said yes, according to the court records.

She handed the cop three plastic bags stuffed with 10 small plastic bags of heroin each, according to the court papers.

“Yes I have drugs. He’s by boyfriend, I was holding on to it for him,” Kalikow told the cop, according to court records.

Both were arrested.

Whalen told cops he was selling the drugs to fuel his habit.

“It was my idea to go on Craigslist and post the ad. I need treatment. I am a heroin addict, and to afford the drug I agreed to sell some … on consignment for the person I buy from,” Whalen told cops, according to court records.

Both were arraigned on criminal possession of a controlled substance in Bronx Criminal court this afternoon. They were released on their own recognizance.

Peter Kalikow, 71, a former MTA chairman, helms his family’s successful real estate firm with a portfolio anchored by a blue chip commercial building at 101 Park Avenue.