Hey how often do new walkups open? The ones I've been too look like they've been around for centuries. Do walkups just creep into a building one-by-one? Or does the landlord wake up with a boner one day and decide to convert his building?
Here's the point: if new walkup buildings do open from time-to-time, is there a way to know and give these places a spin? All in the spirit of exploration!