(MI-81-80) 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 west most turret. (N42 18.001 W83 42.962) Photo by Mark Comstock 5-23-22.