Found it! I have driven past there every day for the last week and my hunch has told me that it is the rather unremarkable building that is now home to the Phoenix Boys' Choir on Missouri just west of 12th.
The tip-off was the idea of re-claimed columns. I looked for them and boy did I ever find them. They are ornate and twisted-swirly so not Haver-esque except for one quality: they are reclaimed.
I asked Bucky tonight and he confirmed that yes, it is the Boys' Choir building now. I mentioned that it was pretty unremarkable on the outside and he nodded in agreement, but that they were classic Ralph style in that they used cast off materials, Ralph never being one to waste. True.
As for myself, I like the lighting store (?) just south of Missouri on 12th with the funky interlocking circles on the 2nd story railing and huge masonry volume to the south. Kudos to whomever designed that beauty.