A Port Authority of New York and New Jersey spokesman says the teen was arrested and charged with misdemeanor criminal trespass.
The spokesman, Joe Pentangelo, says the teen got onto the construction site of nearly completed tower through a small fence opening. He says the teen eluded an "inattentive" security guard on the 104th floor.
The guard has since been fired.
The teen was arrested on the premises at 6 a.m. Sunday. His camera and cellphone were seized after authorities obtained a search warrant. He was later released without bail.
The investigation into the security breach continues.