Eastern Black Walnut
Valleybrook Drive, Lancaster PA (across from 250 Valleybrook Drive, near swimming pool)
This tree, growing at a protected and competition-free site, is the largest Black Walnut in Lancaster County and the fifth largest in the state of Pennsylvania. In 2013 it measured 187 inches in trunk circumference, 85 feet in height, and 82 feet in spread (pabigtrees.com).
This amazing species, highly prized for its timber, nuts and beauty, has occasionally brought $10-20K for a single mature tree. As a result, large specimens have been nearly eliminated (through harvesting) in some parts of the country. [The first two photos are from pabigtrees.com]