(Commenter Andrew sent in a link to a much better map [above], than the scan of the handout at the mall I originally used [below], and the numbers are the same, so I'm adding it).
Well, I finally had a chance to go looking in some old City Directories for information about Dutch Square. I was looking at about 5 year intervals, and only had time to get up to 1997 before the library closed, so rather than a "Dutch Square: Then & Now" post, this is a "Dutch Square: Then & Then" one.
The 1971 directory is the first one to list Dutch Square, but notice that it uses completely different suite numbers than the later listings I have here. And all the City Directory listings use different suite numbers than Dutch Square itself uses on its current handout map.
In any event, it's not always possible to do a complete mapping of the old numbers to the current floor-plan as there has been a good bit of remodeling over the years (for example, the Woolco space being broken up), and some of the old exterior-only slots like Jackson Camera and Baskin Robbins don't seem to be pictured on the current map. That said, here is a mapping of some of the City Directory to Map numbers that I'm pretty sure of:
|21||176 (part of)|
UPDATE 17 June 2011: Added the leaseplan map from a link provided by commenter Andrew.
UPDATE 21 June 2011: Added [at top] an artist's conception of the original Dutch Square from an old Chamber of Commerce promotional book.