Battersea Power Station
Famed as an album cover to Pink Floyd's 1977 album "Animals", this building has been admired as a piece of heritage architecture, but is under threat (see http://bps.fika.org/ ).
Built as a coal burning power station in the 1930s, the four tall chimneys gave a very distinguished landmark to this part of London. The power station ceased producing electricity in 1983, the building having been declared a heritage site in 1980.
There have been plans to convert the site to a theme park and an arts centre.
Another power station which successfully changed its use is now the Tate Modern gallery.