The flaw with such data as this is that it is extracted from whatever prime developments that the compilers choose to assess. CBD houses various developments of proportionate size and exclusivity , so it is a false impression that this data represents the district as a whole.
That's true but they do that for every city -- so the data is roughly comparable across cities, and the prime rates tend to "set the market" -- aka even second-tier developments will command higher rates in desirable areas when they see what the bigwigs are charging.