It is within 1000' of a freeway right of way, is a proposed bank so it is not an occupancy that falls under the exception, so CALGreen 5.507.4.1 requires that the envelope wall and roof-ceiling assembies have an STC rating of at least 50. Proximity to property line, type of construction and use do not mandate any fire-resistant construction, so it only the STC we are dealing with.
Both the GA manual and UL do not list STC ratings for exterior walls or roof assemblies. only fire-resistance ratings. The CBSC Non-res guide has a link that provides some wall and floor-ceiling assemblies, but does not include roof assemblies, http://www.toolbase.org/PDF/Ca.../stc_icc_ratings.pdf.
The architect has proposed an interior wall assembly with an STC rating of 51-54 for the exterior wall, and adding a 7/8" stucco to the exterior membrane. Their Acoustical consultant is proposing adding insulation to the ceiling assembly, but I can't find any quantifiable way to determine whether it meets code or not.