On two occasions, employees said they have come to work in the morning and found bullets and glass everywhere.
The shootings happened less than a week apart.
Owner Mark McDougal thinks someone is pulling over on the West Loop and shooting either a 9-millimeter gun or a 45 into his building.
McDougal said it's going to cost more than $15,000 to fix the damage, but he knows it could be worse.
"We have cleaning people up here until all hours. Sometimes they may not show up here until 2 or 3 in the morning and you know-- we certainly don't need a stray bullet intended just to break a window, to go through an office. If this door wouldn't have been shut it could've gone through this whole building-- and catch somebody," McDougal said.
If you have any information about this call CrimeLine at 741-1000.
McDougal put a $5,000 reward up-- if your information leads to an arrest.
And CrimeLine added $500 to that bringing the reward total to $5,500.