Split face block could almost be considered a perfect building material.Like other concrete block, it is formed of molded concrete, though the split face is formed with an extra-thick face shell.

Kurt Mitenbuler, who operates an eponymously named home inspection firm in Evanston, is among those inspectors who have been warning about split-face block for years.

Split-face concrete block residential buildings are the parking meter lease deal of Chicago architecture: ugly, regrettable—and something we’re stuck with for decades to come.

If you want to face off against the Ice King, you'll need to get past the door puzzle and the ice block puzzle first.