I've put together a small demo in Sandcastle: http://cesiumjs.org/Cesium/Apps/Sandcastle/?src=Hello%20World.html&label=Showcases&gist=a79e5738fbc22b115c6d4cb3c5b42e88
Using Cesium.DistanceDisplayCondition(0, 1000) works properly, I think, though I haven't measured the exact distance. But at least the corridor is showing when zooming in.
When using Cesium.DistanceDisplayCondition(1000, 10000) though, the corridor is never shown.
Thanks in advance!