Here is a better look at the Muppet Stuff sign...
And here is a closer look at the Sesame Street items in the window display...
There are lunch boxes (with a small Snuffleupagus plush toy on top of one), place mats, two large plush Big Birds, a large plush cookie monster wearing a light blue shirt, some Snuffleupagus plush toys and Elmo from the Applause toy line, and a small Hasbro cookie monster plush toy wearing a red T-shirt. I can't make out much else, other than it looks like Big Bird is sitting on a children's slide.Later on in 1989 or 1990 a Muppet Stuff store opened at Bayshore Shopping Centre in Ottawa. I bought a good portion of my collection there!
It's hard to see the faded print, but this is my receipt from the Yonge Street Muppet Stuff store, dated 08/04/88. It confirms the address was 2588 Yonge St. The total shown is for $2.15 for an embroidered Muppet patch, shown below. I also kept the plastic Muppet Stuff store bags! I'll post them here eventually too. :)
I also bought this small Animal pin at the Toronto store, but it was a separate transaction than the one shown on the above receipt. In the very first photo above, you can see a white T-shirt above Big Bird that has this same graphic of Animal.