First, I assume everybody agrees they ARE Sharp-Shins?
They are on private property, and located about 20 metres up in a black cherry tree as well! You might be able to see them once they're flying, from the park next to St. Andrews Junior High School (may be Middle School now?) on Fenn Ave. Enter the park from Knollwood and walk in to where the wood, heading east and go in about as far as the wood steps that come down from the school. They're in trees on the other side of the valley from the school, but not right at the edge.
My experience in previous years is that once they're out of the nest, they will spend a week or two in the immediate area. Their screeching for the parents to bring them food is pretty easy to hear. You may also be able to see the parents come and go. They sometimes will perch in the open, on branches or fences, so you may get a look at them.