the knightsbridge flat , london , which is on sale for a fraction of the price of neighbouring homes , has just three years left on the lease .
the cost would work out at £ 191,000 per year , or £ 15,000 per month - which is around the going rate for renting a three-bedroom flat in the area that the entrance to the flats in one of the most expensive areas to live in britain where a three-bedroom apartment has been put on the market for just £ 575,000 .