If you some weirdo taking photos of things like doorsteps—well, now you know who it is. Any idea where I shot this one?

It’s the doorstep of Peter Townsend’s architecture firm, at 1 White Street, recently put on the market and in the news here. (You may know the building better as the home of Columbine.)

Previous “Where in Tribeca…?” entries:
• March 12: Twine sign
• March 8: Mosaic fire hydrant