Sanders sign Blast from the Past...

[bust]

So it turns out the new radios on the facade are an anachronism. The Grinnell building was built in 1908, well before cathedral radio was thought of. The ankhs are too, in a way, because the Egyptian craze wasn't until the 1920's. I wonder if the facade designers told the owner?

According to the photo on "souvenir program" from the Grinnell building's opening in 1908 the ankhs and what you're interpreting as cathedral radios were part of the original design.

Historicdetroit.org has it here:
http://www.historicdetroit.org/galleries/grinnell-brothers-music-house-artifacts/

I hope those bricks that stick out above the windows mean more is coming to restore the original design. Are they supports to attach more fiberglass replicas? It would be odd if it were intended as is.