How on Earth redevelopments like those were ever approved is beyond me.
I've never actually seen anything quite like it, but the architects and local authority planning committees should be ashamed of themselves.
Here's how it should be done, although others might take a contrary view.
The Ovaltine company ceased production at its factory in King's Langley, Hertfordshire in 2002.
The site was redeveloped into luxury flats but the facade of the factory was retained and incorporated in the new building.
Now, despite my loathing for Art Deco architecture, I think that they made a good job of it. YMMV.
Street View Sep 2009
Can you see the join?