Yeah, regarding I-35 and Ben White, that's what I originally meant when I said 35 and William Cannon. It (71/35) seems like the most logical area to urbanize, with its access to the airport and freeways and plenty of under-utilized land. Is there any kind of zoning to encourage urbanization outside of downtown? I recall some kind of designation that was made several years ago but I don't know what form that took and whether it's likely to encourage vertical growth or merely to permit it.
That triangle between Koenig, 35, and Airport, does seem like prime real estate for intense development, unless the sad little residential neighborhood has its own association that would fight for preservation of its sad little status.