Sixteen-year-old Justin Casquejo, of Weehawken, is charged with misdemeanor trespassing.
He allegedly broke in around 4 a.m. Sunday. He had no identification, but may have been dressed like a construction worker.
Police say he accessed 1 World Trade Center, and an elevator operator took him to 88th floor. He then climbed to 104th floor and walked past a sleeping guard. That guard has since been fired.
Authorities say he climbed through a hole about 1 foot by 1 foot to reach unaccessable areas.
The teen apparently had little trouble getting past security. He was stopped by another construction worker as he attempted to leave the building, and police were called.
"We take security and these types of infractions extremely seriously and will prosecute violators," Port Authority Chief Joseph Dunne said. "We continue to reassess our security posture at the site and are constantly working to make this site as secure as possible."
Casquejo was detained by Port Authority police officers responding to a report of a unauthorized person on the site.
Casquejo was in possession of a camera and a cell phone and had apparently taken pictures from the top of the building, where he stayed for about two hours.
Port Authority officials said the breach and security at the site are all under investigation.
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