http://m.imgur.com/a/YmqbR this is the screenshot evidence. Note this test is completely isolated with no other actions happening during the test. I demolished willowick condos which was originally built when the wealth forecast was premium grade but had by now changed to luxurious. I put a new RZ in its place and upgraded to Elysian heights, which is luxurious grade. You can see population and hence tax revenue are identical between the two building types. (Note the pics are in reverse order but its still obvious. Be sure to scroll right down to the fourth image which is the first in sequence.)