For a better direct comparison, take a look at this report: http://issuu.com/ccdphila/docs/defin...724344/5035693

DC's CBD rates 4th behind Midtown, Downtown NYC and Chicago at 0 mile, half mile, and 1 mile buffers. The look at Census LED data rather than official designations. For example: Chicago v DC. To pick up all if the areas you mentioned falling within the DC CBD, you need to look at the Hal mile buffer number. You'd need to do the same for Chicago, because...