McDowell said the behavior is criminal and if it happens again, the teen would go to jail.
In October, two other young men involved in the incident spent two weekends in the Washington County Detention Center. They also paid $1,000 each.
Ryan Bradley Moats, 21, of 12930 Oak Hill Ave., and Bryan Thomas Ingram, 20, of 13915 Green Mountain Drive, Maugansville, each pleaded guilty in Washington County District Court to two counts of malicious destruction of property.
Each was fined $250, ordered to perform 48 hours of community service and placed on two years of probation.
The charges came after a citizen called police on June 21 after seeing three young men painting the Smith, Elliott, Kearns and Co. building at 480 N. Potomac St. at 3 a.m.
Officer Bradley Helman arrived within minutes and apprehended Ingram at the scene, court records said.
Some of the other incidents occurred at the Turnover Shop, at 22 Wayside Ave., and Dennis Monn's Hair Studio, at 600 Potomac Ave.
Other victims included Richards World of Travel, Allegany Electronics, Repairs Unlimited, Dixie Millwork, County Supermarket and Four Seasons RV.
In Maryland, graffiti damage under $300 could result in fines of $500 and/or 60 days in jail. Over $300, the penalty is $2,500 and/or three years in jail.
Graffiti of a religious or ethnic nature can bring penalties of up to $5,000 in fines and/or three years in jail, police said.