The New Jersey teen accused of breaking in to the site of the World Trade Center earlier this year has plead guilty.
Justin Casquejo admitted in court that he broke a city misdemeanor law and scaled the nation's tallest building without permission.
The 16-year-old from Weehawken was arrested in March after he made his way up to the building's 104th floor, then went out onto the roof and climbed a ladder to the antenna.
Court papers say he slipped through a small gap in a construction fence.
His climb raised questions about the building's security, and an on-duty security guard was fired after the incident.
The teen is expected to be sentenced to 23 days of community service.
Since this breach and several others the building has altered their security measures.