There haven't been any comps on Olympic Blvd. near Wilton/Arlington for this type of big, new building. Condos in smaller properties on side streets in the area have been going for about $280 s.f., and listings in similar buildings in the area on Wilshire have been going for abot $380 s.f.. $320 s.f. doesn't seem out of line.
Please feel free to contact me if you'd like more information. Best of luck.