I found the first one back in the fall, on W. Pratt at California.
It's nothing special in plan or massing, just an ordinary Chicago apartment block, a bit lacking for windows. But it's clothed in the crazed spirit of the 1960s, when pastels were fine and spots of random color were king.
The entry is a confection of 1960s geometrical exuberance, with patterns in blue glazed brick laid against a cream brick background, and accents in colored tile. Blue piers highlight the building's corners and are used in a decorative grid of squares on an otherwise blank wall.
(Pratt, by the way, is a terrific shortcut for bicyclists looking to head west out of Rogers Park. There's enough stop signs that the traffic isn't roaring by too terribly fast, and it runs all the way out to the river without interruption.)
Then I bumped into another one while tooling around Rogers Park. Number 2 is at 1322 W. Chase Avenue, not far from the lake. It doesn't take much to see the connection. One's an oddity; two's a reproduction.
Sure enough, hidden behind shrubs and the neighbor's fence, there's that same entry detail. But wait! It's not quite the same -- the colors are different, and the tiles are separated by a soldier course of brick. Variations on a geometric theme -- sound familiar?
Then as the day wound down, I found a third one -- 7241 N. Claremont Avenue, just off of Touhy. If three buildings do it, then, folks, it's a organization!
This one's the clear winner of the bunch. In addition to the blue brick piers, the limestone outlines, and the blue brick squares, it's got porch railing screens in the same spirit of exalted geometry. It's had an unfortunate gabled entry cover tacked on, which really should be a flat canopy, but otherwise it's still looking 60s snazzy.
But the real shocker came at the entrance, where, lo and behold...
...there stood none other than the elusive geometric pattern blocks! Could this trio be yet another construct of my mystery suburban builder? The M.O. certainly fits. Stay tuned!
Edit: I've since found another half dozen of these buildings; photos may be seen here.