[Eric in the Ozarks]

You know...I don't really know. I believe it is the "Henry A. Wallace State Office Building" on East Grand Avenue in Des Moines.
I'm a little ashamed to say I don't know which Wallace the building in named for. I do recall that the Wallace' were associated with Pioneer Seed Company and published a farm weekly newsletter called Wallace's Farmer. The building went up in the early 1970's.

[x]

The father was Henry C. Wallace, so the building must have been named after the son, a "useful idiot" in the old American tradition, like Harry Hopkins or many others.