Hundreds of cars and an estimated 1,000 people reportedly descended on a historic Monroe, New York, mansion on July 11 after organizers promoted a large "Project X" pool party. Homeowner Osher Zelik says he was misled into renting to a supposed family; the event left severe damage including a septic backup, smashed windows, broken cabinets and a destroyed 150-year-old baby grand piano. Monroe's status as an unincorporated town limited local enforcement, and officials urge stronger host screening, tighter permits and faster platform responses to prevent similar incidents.
Historic Monroe Mansion Turned Into Massive 'Project X' Party, Owner Says — Septic, Piano and Windows Ruined
Photo Credit: iStock
Neighbors say a weekend short-term rental in Monroe, New York, spiraled into an enormous overnight party that left a historic mansion badly damaged and littered with trash.
The homeowner, Osher Zelik, says he believed he was renting the property to a young family for a quiet weekend. Instead, Yahoo News reports that the July 11 gathering drew hundreds of cars and an estimated 1,000 people to 64 Sapphire Road, clogging a normally quiet Hudson Valley street.
Extensive Damage and Public-Health Concerns
Locals say Zelik spent years restoring the 19th-century house before it was reportedly transformed into a chaotic mass event. By the time the party ended around 5 a.m., the damage was severe: the septic system had backed up into the home, several windows were smashed, cabinets were destroyed, and a roughly 150-year-old baby grand piano was ruined.
"It is like a nightmare. Just a nightmare," Zelik told reporters, calling the episode "an organized scam." Across the street, neighbor Cristina Kiesel said she felt sympathy for the owner: "He had no idea. He was told it was a young family renting for the weekend. He was really duped."
How It Happened
A social-media flyer promoted what it called "the biggest Project X mansion pool party in the world," and organizers reportedly withheld the address until the day of the event. Monroe Town Supervisor Maureen Richardson said Zelik was in the process of applying for a town short-term rental permit when the house was listed on Booking.com.
Residents described the area as remote and ill-equipped for a crowd of that size. "We're not equipped to handle that many people at once. Thankfully, no one got hurt," neighbor Andrea Forlini said, noting how local roads and emergency services were overwhelmed.
Law Enforcement And Liability
Monroe is unincorporated and does not maintain its own police department, which limited local enforcement options. A State Police spokesperson said troopers who responded that night determined none of the incidents "were criminal in nature and no criminality was alleged." Richardson said she was shocked the State Police did not deem the situation to require breaking up the gathering.
Prevention And Policy Recommendations
Experts and local officials recommend steps hosts and officials can take to reduce risk: verify guest identities, require detailed rental agreements and security deposits, set strict occupancy limits, and explicitly ban parties. Municipalities can tighten permit rules and improve event-enforcement capacity. Rental platforms should flag suspicious reservations, act quickly on complaints, and support hosts facing fraud or major damage.
When septic systems fail, the consequences are costly and create serious sanitation concerns for homes and neighbors. Cleanup and repair costs, potential insurance disputes, and the loss of irreplaceable historic items — like the 150-year-old piano — underscore the stakes for property owners and communities.
"He was really duped," said neighbor Cristina Kiesel. "It's an organized scam," Zelik added.
The physical destruction and cleanup needs remain clear to Zelik and his neighbors as investigations and repairs continue.
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