This stamp (and a second one a short distance away, probably the other end of a run of sidewalk replacement) is on the east side of South Clemens Avenue south of Michigan. It’s next to the parking lot behind the infamous Venue at East Town. I know the date is hard to read in this night photo, but I inspected it closely with my flashlight and it is 1980.
According to Open Corporates, the Ken Roberts Construction Co. of DeWitt incorporated in 1965 and dissolved in 1989. Its practical end probably actually came a bit earlier than that. A large classified advertisement in the June 27, 1982, Lansing State Journal heralds an upcoming auction of heavy machinery, concrete equipment, and miscellaneous items “too numerous to mention” from the Ken Roberts Construction Company. It certainly looks like a liquidation auction.
From the above advertisement I also learned that there used to be an airport outside East Lansing, since it gives the auction site as “across the street from Davis Airport.” I had to look up where the heck Davis Airport was and I learned to my surprise that it was still extent (though in a very diminished form) as late as 2000 and is now buried under the gigantic student apartment complex known as Chandler Crossings.