Know Before You Go
There is a "Private Property: Keep Out" sign that is hidden in the brush by the entrance. But if you ask the municipality for permission to enter and let them know you will be careful, and promise not to destroy the site, they are more than happy to talk to you about the history.
The building is to the left of 100 Thompson Street. No address is listed for it. You have to walk up the road a bit until you see a small stone wall. The site is past the chain blocking cars from pulling in. Walk up that. There is a path to the main structure that sets you in the middle of the property. There are two small gray structures that are straight ahead, the path to the middle structure is way before that to the left. Please be careful when you visit any abandoned sites. Always bring someone with you, tick repellent, and a camera.