The side yard and the back yard of 423 Concord borders conservation land. If you look closely you can see a conservation marker on the tree in the center of the photo. The break in the stone wall is the beginning of the trail from Concord Road. The trail easement at this point is only about 30' wide until it reaches the main bulk of the 10-acre conservation park.
This view from 423 Concord's yard shows the distance of the easement which is between the wood fence in the background and the stone wall in the foreground.
Looking down the property line just to the left of the shed to see more of the conservation land.