Today's mosaics are mountd in the lobby of the Downey Civic Theater on Firestone Blvd. (or 2nd, at Brookshire) in Downey. The 748-seat theater is part of the Downey Civic Center and Embassy Suites Hotel.
The Downey Theater (the word "Civic" seems to be optional) had its gala opening with a performance of "The Sound of Music" in late October, 1970, according to the Los Angeles Times. It's history goes back a bit further: for fourteen years, a Downey Children's Theater Group had operated out of a school auditorium. Eventually the city raised $1.9 million through cigarette and hotel taxes, specifically to build the theater.
The Times was impressed by the local participation: Downey residents assembled two 70-member casts for the musical, each complete cast playing alternate shows (except for John Woods, who played Capt. von Trapp in all shows. He was that good.) Local residents also made up the 35-piece orchestra. No mention of the lobby mosaics is made, though.
In March 1971, astronauts Alan Shephard, Edgar Mitchell, and Stuart Roosa landed by helicopter in Downey and spoke at the theater. It was a busy place--looks like everything from beauty pagents to opera to marionettes have played there.
The theater's had its ups and downs over the years, and I've looked over dozens of articles. But nowhere do I see a mention of the mosaics!
I suspect--since they deal so much with history--that they were added either during the nation's Bicentennial (1976) or Downey's Centennial, a few years ago. But that's a guess.
This last picture is added to give a sense of the lobby--the mosaics are upper right. The photos are in a Flicker stream presented by the Downey Historic Conservancy.
If someone can enlighten me, tell me when the mosaics were installed and who the artist is, etc. I will gladly post that information along with your favorite picture (as long as it's not obscene).