A reader alerted us to the fact that a new billboard is up on the side of the Richard Meier design overlooking Prospect Park. Turns out everyon’s had the name wrong all along. Rather than One Prospect Park, it appears to be going by On Prospect Park (sounds more like a new TV show). There’s even a website where, if you’ve got well over a $1,000 a foot to spend, you can sign up to be on the building’s preview list.