Ever since I moved to uptown and pass this home on my daily commute I've been waiting for a chance to see these duplexes. After touring it today, I'm pretty sure this is the "12th Street Gang Duplexes" mentioned in the Haver portfolios. I believe these may have been showcase homes for replication elsewhere, like as suggested Pueblo Bonita.
http://www.modernphoenix.net/pueblobonita.htmIf they look a little European in influence to you, you're spot on, this was the selling trend at the time. Greek, Mediterranean, Middle Eastern were all popular flavors in development in the late 60s and early 70s.
The details in the kitchen, bath, front door, back wall and front exterior lighting all point to the Haver firm's transition into multifamily housing, which is where the market led them. The greens are a creamy avocado and in the kitchen cabinets, almost a glistening emerald. The bath has marble with a green streak and the tile is spattered green glaze. Even the doorbell is stylish, and more uropean than modern. But it was the exterior lighting that had me at hello.
Around that time period, Haver's firm employed James Salter AIA as their interiors and finishes designer. Some say he was responsible for the total look of the Kon Tiki and the Cine Capri, and very much involved in the Arizona Bank (The Vig Uptown). Around that golden age of the early to mid 60s, they started doing in-house designs for lighting and chandeliers, much of which you can find streetside in Phoenix today, especially the Avenida Hermosa, Casa Hermosa and related complexes. You can also find them inside their furniture stores. A gigantic chandelier salvaged from another location is to be found in Jimmie Nunn's own Flagstaff chalet. It was so large, they had to cut it in two and then port it inside for reassembly.
After taking a look at these lanterns and the finishes, I am hedging my bets that this is the 12th Street Gang that I have been searching for, as a perfect bridge into the Pueblo Bonita duplexes. I think we have found a missing link here and I'll work toward validating it through my various channels. If I'm wrong, I'll gladly stand corrected.

What a fun experience and adventure to puzzle this out!