I had gone to the Michigan AB Grill, shortly after it opened in 1999. The food was good, they had lots of souvenirs for sale, and had re-creations of a couple of props (The "Rate-A-Record," board '60s style, and the "Top Ten," board '80s style).
I made the trip out there in November, 2000 to meet Dick Clark himself, but his visit was cut about an hour short of plans. I was disappointed, and hope to meet him someday, but first I hope he gets 100% well again!
I don't know exactly when it closed, but a year ago I was at the mall where the grill was located, and the signs and graphics were still up, and the entrance doors blocked.