(MI-81-79) in Ann Arbor, Washtenaw County, MI. Plymouth Rd. NE 0.2 miles from jct with Broadway St., left on Willowtree Ln. 150’, right on unnamed road 100 yds to the bldg. This is the east most turret. (N42 18.004 W83 42.945) Photo by Mark Comstock 5-23-22.