In response to the swathe of supertall luxury residential towers rising in New York, local studio Oiio has proposed a conceptual skyscraper that loops over to boast length rather than height. The Big Bend would be formed from a very thin structure that curves at the top and returns to the ground, creating what the architecture firm describes as the longest building in the world. Oiio, based in New York and Athens, came up with the proposal to highlight the race for height between Manhattan’s luxury condo developers. Real-estate companies are capitalising on a planning law that permits them to purchase air rights from neighbouring buildings, allowing for taller and taller towers on relatively small plots.