Serum Institute of India's (SII) CEO Adar Poonawalla has rented a property in London's Mayfair for about 50,000 pounds (around ₹50 lakh) a week, Bloomberg reported. The rent agreed upon by Poonawalla is a record for the exclusive London neighbourhood, it added. The 25,000 square feet mansion, equivalent to about 24 average English homes, comes with an adjoining guest house.