I learned that Merge to HDR Pro can do a pretty decent job of aligning handheld exposures like this example. Because the phone wasn't braced, each original image is slightly misaligned from the other, but you wouldn't know it by looking at this shot. The only real giveaway is the cast shadow in the foreground. I think I can clean this up with Photoshop, though and the Healing/Clone Stamp tools. We'll see . . .
As with any HDR image I'd take the time to shoot with my DLSR, taking more exposures would have been a good idea. Doing so might have resolved the blue cast I was getting in the walkway.
This image might also be a good candidate for Luminosity masks. Ah, another project!