Yep. Judging by Detroit's zoning maps, the city boundary goes through the backyards of homes fronting Hazelton.
And also, the boundary doesn't follow the railroad tracks but instead lines up directly to the southern edge of those homes on what would be Fullerton if it [[or did) continue.
The administrative building of Detroit Diesel should be on the Detroit side of the border with the rest of the facility within Redford.
You can tell where the divide is by the pavement changes. It may actually be off the line by a few feet on some streets but otherwise should be pretty close.
http://goo.gl/maps/A9JNa
http://goo.gl/maps/2SILA
http://goo.gl/maps/OdHOL
http://goo.gl/maps/hYlN3 [[trees actually are on the divide here)