Dutch wrote:it's costly to do new build
Big misnomer regarding LEED. If pursuing LEED from the project's inception, costs to achieve LEED (not Platinum obviously), can be the same as a comparable building or with a reasonable range (2-6%).
Now, although I'm a certified LEED professional, I'm not completely sold on LEED being the answer for a more sustainable built environment. As it is now however, it is the best option to convey to the public that your building has sustainable features.
Retrofitting doesn't have to be costly either, depending on where your mechanical systems are in their life cycle, the cost can likewise be negligible compared to a typical remodel. If your systems are in good shape and you choose to replace them, that is where the cost gets prohibitive.
I agree that Dallas Hall is probably not a candidate for an upper end LEED designation as that would require wholesale replacement of the buildings windows among other things. I am also an admirer of historic buildings and would hate to see the magnificent building's historic character altered.