HMS really seems to know what s/he is talking about. This article is clearly not valid. Of course average Park Slope rents didn't go up from $1k to $3k in two years....the fact that the author used different sets of data for comparison was the tip off that something was wrong, and then HMS filled in the details. Since the author is reading these comments, I'd like to see him respond to that, and maybe try to go back and re-report the story comparing apples to apples.