The incident happened in Ulster County on Monday, May 1 in the town of Ulster at the I Park 87 property (former IBM campus) on Enterprise Drive.
The teens, all from Dutchess County, ranging in age from 17 to 19, were arrested over the past week by the Ulster Police following a month-long investigation, said Chief Kyle S. Berardi of the Ulster Police.
The investigation found the teens forcibly entered one of the buildings on the property and intentionally caused approximately $30,000 in damage to the building, Beradi said.
Six were charged with felonies of burglary and criminal mischief, the chief said.
Two were charged with conspiracy and one was charged with criminal trespass.
All nine were processed and released on appearance tickets to either Ulster County Family Court or the town of Ulster Court to answer the charges.
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