Piers Gough has objected to this extraordinary proposal for a new penthouse addition to his award-winning Bankside Lofts apartment building next to Tate Modern on the South Bank.
The proposal by Decoi Architects was rejected by Southwark's planning committee at the end of last year, but is now going to appeal.
It has triggered a storm of protests from the same local group that fought a passionate campaign two years ago to see Philip Gumuchdjian's plans for a neighbouring tower rejected.
But it is Gough, a principal of CZWG, who is most fiercely opposed. He said:'I felt bad about objecting because I always try to encourage young architects.
'However, this is a ghastly scheme and I don't want something that looks like a flat hat on top of the building.
'It is also an incredibly complex structure and unless the client is very, very, very, very, very
rich, it will almost certainly be badly built,' he added.
The project is currently awaiting confirmation of the appeal. It is understood that it will almost certainly be a written, not a full hearing.
Decoi Architects was unavailable for comment. by Ed Dorrell