Not so good news as it is going to cost you legal fees and you will also need to pay for a survey. If they are on your property sounds like a no-brainer that you would win the case but that is where your attorney comes in. Call one IMMEDIATELY. If you need a name and number send me a separate email.
Ian Halpin / Broker
Jameson Sothebyâ€™s International Realty
425 W. North Ave. / Chicago, IL 60610
O: 312.335.3220 / F: 312.229.9190 / C: 773.531.4479
email@example.com | http://www.jamesonsir.com
did you just watch as the building, or portion thereof, was erected/finished on your property???
regardless of the reason you didn't take any action, now it's time to contact your lawyer.