Twin real-estate heirs Oren and Alon Alexander allegedly sexually assaulted two women — including one they took turns raping in a Hamptons castle, according to explosive Manhattan lawsuits

A lawyer for the powerhouse businessmen quickly dismissed the allegations to The Post on Monday, saying they are nothing more than a multimillion-dollar shakedown attempt.

The two civil complaints, filed in March, center around alleged heinous attacks that occurred in 2010 and 2012.

Oren, a prominent figure in the Side-backed brokerage firm Official, and his twin brother Alon, a private security firm executive, are named by two women who claim the brothers have a disturbing history of committing assaults together.

High-powered twins Oren and Alon Alexander attend NASCAR legend Jeff Gordon’s retirement party in Miami in 2015. Aaron Davidson

One of the women claims in court papers that the brothers raped her at infamous party palace “Sir Ivan’s Castle” in Watermill, LI, and while the other says she was just 18 when she was attacked after being drugged by the twins at a Meatpacking district hot spot.

The lawsuits landed after New York’s law allowing alleged survivors to sue for old sexual assaults was extended.

The lawsuits paint a chilling alleged picture of Alon and Oren, the latter of whom helms the high-flying Alexander Team along with a third sibling. The venture has overseen more than $7 billion in real-estate deals across New York, South Florida and beyond since Oren left his longtime firm Douglas Elliman in 2022 to start the business.

The legal filings allege harrowing instances of violence by the twins — including taking turns raping the plaintiffs, leaving the victims with lasting trauma.

The twins get in the patriotic spirit at “Sir Ivan’s Castle” in the Hamptons on July 3, 2011. Steven Henry

The Alexanders’ lawyer, Jim Ferraro of the Ferraro Law Firm, vehemently denied the accusations.

“This suit was brought public after [the Alexanders] chose not to give in to a demand in the tens of millions of dollars,” Ferarro said in a statement to The Post. “We are confident this matter will be resolved in [their] favor given an extensive collection of powerful evidence including, phone records, text messages, emails and other documents whose content clearly debunks these claims.”

The New York Adult Survivors Act — which took effect Nov. 24, 2022, and was supposed to end Nov. 24, 2023 — allowed alleged survivors of sexual assault to seek justice regardless of when the assaults occurred. The window for filing lawsuits was then extended to March 2025, enabled the lawsuits against the Alexanders.

The filings indicate that the women did not file police reports at the time of the alleged assaults.

The lawyers representing the women, from New York-based Torgan Cooper & Aaron, did not immediately respond to a Post request for comment.

“Sir Ivan” Wilzig performs at his flamboyant birthday party at his equally extravagant Long Island home in 2016. Jerritt Clark

Rebecca Mandel’s complaint recounts her alleged nightmare encounter with the twins.

The then-18-year-old says in her suit that she met Oren and Alon at the now-defunct Meatpacking District club SL in 2009 and that in 2010, Alon spiked her drink. The brothers later raped her in their apartment after luring her there under false pretenses, her lawsuit says.

The twins assured her they would “just hang out for a little bit,” her complaint states. Once inside, Mandel claims in her suit, the twins pinned her down and raped her in an act described as “extreme and outrageous to such an extent that the action was atrocious and intolerable in a civilized society.”

In another lawsuit filed the same day in March, Kate Whiteman alleges a 2012 assault at the infamous party palace “Sir Ivan’s Castle” in the Hamptons, a home owned by recording artist Ivan Wilzig, who is also named in the suit for negligence. Wilzig did not immediately respond to a Post request for comment.

Kate Whiteman alleges she was assaulted by the Alexander brothers in 2012 at “Sir Ivan’s Castle.” Jerritt Clark

Whiteman’s lawsuit recounts her allegedly being dragged by Alon into an SUV where Oren awaited, taken to the castle and assaulted by the brothers despite her attempts to escape.

Ferraro told the web site The Real Deal, which first reported the lawsuits, that the case is “totally made up” and predicted it will crumble after Whitman’s deposition.

Ferraro also labeled Mandel’s lawsuit as “very bizarre,” expressing his longstanding trust in the Alexanders, having used Oren as his real-estate agent for years.

Oren Alexander celebrates the return of The Raleigh, a Rosewood Hotel and Residences, at The Carlyle in Manhattan on May 8, 2024. Darian DiCianno/BFA.com/Shutterstock

Lawyers for Wilzig have moved to transfer Whiteman’s case against him to Suffolk County, where his home is located.

The Alexander twins, who now live in Miami Beach, hail from a real-estate dynasty led by their father, Shlomy Alexander. Their brother Tal, another top broker, remains uninvolved in these allegations, focusing on their projects such as the Rosewood-branded condo at the Raleigh in Miami Beach and the Dolce & Gabbana-branded condo in Brickell.

The twins have until Aug. 19 to respond to the lawsuit.

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