Before You Build... Be Sure to Call Harmsen!

This is a classic example of why having your property surveyed before you build is valuable, inexpensive insurance:

At one of the popular parks in Seattle, adjacent home owners thought the fence around the park was the boundary.  As a result, one of the homeowners added on to their house.  They then found out that the park property actually runs through the middle of their new addition.  That could mean that they would have to remove the addition or negotiate with the City...