Some pay full owner 's rent , fees and fees up - rent to land properties . On average , desperate buyers in London pay over £ 200,000 to landlord . Figures also say average prime London home costs £ 3,500 a month to rent . Frenzy being caused by super - rich tenants and fears of income tax .
Some pay full year 's rent , deposit and fees up-front to land properties . On average , desperate buyers in London handing over £200,000 to landlord . Figures also say average prime London home costs £3,500 a week to rent . Frenzy being caused by super-rich Russians and fears of mansion tax .