Housed in a 1920s light industrial building at the Southern end of the square, the gallery was designed by MRJ Rundell and Associates, and has a large uninterrupted exhibition space downstairs, and a smaller upstairs area.
Your author used to live right behind the White Cube, and as such it was his 'local' when it came to art galleries. In his, uneducated, opinion the exhibitions were patchy. Sometimes excellent, sometimes rubbish, but always free. Readers should consider, however, that art is subjective, so they may love or hate it all.
Nowadays, the gallery is one of two White Cubes, with a newer sister gallery in West London, but your author will save that one for another post. For more, see http://www.whitecube.com/