Here's a picture of the 20 Blackfriars Road tower which has been rumoured for some time now.
The height is thought to be somewhere between 175 and 200m, and it would stand next to the Beetham Tower.
"...Modernist towers tend to be very perfect forms and rely on repetitive cladding. But in today’s
environmentally-conscious world it doesn’t make a lot of sense for the north elevation to be the same
as the south, so we try to create excuses to introduce difference. There are games you can play,
such as curves, but the client for the South Bank tower did not want curved forms, so we are looking
at a more angular geometry and breaking up the façade into planes. Putting diagonal crease lines in it
is the easiest description, like cars where a very fine crease line catches light differently so it changes
the appearance."
-- Chris Wilkinson, Wilkinson Eyre Architects
Location shown in green -