Add a building visible on Bing Aerial Imagery and Esri World Imagery https://www.openstreetmap.org/way/1267346503
Probably linked to part of the underground culverted Markeaton Brook storm drain (or an ofshoot) from Ford Street to The Riverside Gardens and here.
Discussion in this changeset https://www.openstreetmap.org/changeset/148066918 is currently mapped in the wrong place https://www.openstreetmap.org/way/1256155771