This verges on Curbed territory, but Gothamist was very intrigued by a NY Times Real Estate mini-feature about an apartment for sale. Rather, apartments for sale - two apartments in two buildings, connected by a 40-foot traverse on the Upper East Side (you can find the listing on Fenwick-Keats if you do a search - sale, Upper East Side, 1 bedroom, between $500,000-999,000). We had recently admired the much-photographed traverse on Staple Street in TriBeCa (pictured, left); corie said the House of Relief building, one end of the traverse, is now apartments, but Gothamist hasn't mustered up the courage to knock on the door and ask about the traverse. So, when we saw this real estate listing, we thought we'd pose some questions to our readers, as we know there's someone out there who must know more:

- How many pedestrian traverses/skyways are there in the city?
- How many are still used?
- Was there a architectural trend back in the day where they imagined the cities of the future would be a flipped out modern version of Venice where all foot traffic would be done through these interbuilding corridors because of the piled up refuse that would clutter the streets?
- What happened that made these walkways fall out of favor with architects?

Thanks to Matte for the questions. And for more on flipped-out modern cities, see Metropolis.