You guys must have me on ignore or something. I've explained Parcel B development constraints before. It looks suburban because of the P2 parking overlay which is suburban, more or less. Don't blame the developer, blame city hall. Bieter is no Kempthorne.
A 10 story building would require a huge amount of parking. Probably an economically infeasible amount. I could do the math, number of required spots is based on square footage of building, but I'm guessing no one cares about the actual nitty gritty details of planning and zoning regulations. I'm not sure why Gardner doesn't request a rezone.
So again, there is a big difference between P1 and P2 parking zoning law.
Here's the 2006 parking overlay map again: (if I'm not mistaken, the only thing that's changed: Fairview/Main now have P2)
Pages 128 and 210-226 here:
http://cityclerk.cityofboise.org/med.../11-entire.pdf