Garrett Curran wants to combine the properties on 34-38 Pont Street, a Grade II listed building, into one "mega mansion" over two floors that will be worth approximately £10 million according to the Telegraph.
But to get his project pushed through, Curran is also proposing to renovate an old house elsewhere in the same borough - just to keep the council happy.
Kensington and Chelsea council, which oversees the Belgravia property, has a planning rule that forbids changes that will result in the loss of homes.
So Curran's property developers, Savills, are planning to convert the old house in West Kensington into 4 flats to even out the Credit Suisse boss's plans.
The council will decide by October 5 on the plans - check them out below.