Adar Poonawalla, the head of Serum Institute of India, is splashing out on London’s priciest house of 2023. This mansion in Mayfair, spanning a massive 25,000 square feet, is the most expensive property to change hands in London this year. Poonawalla is shelling out a whopping £138 million (around Rs 1446 crore) for this property.


This huge purchase is not for Poonawalla’s permanent stay in London. Instead, it’s going to serve as a base for his company and family whenever they’re in the UK. Think of it as a guest house for the Serum Institute of India, used to host events, welcome donors, and collaborate with tech partners. This spot in London helps the Serum group grab global opportunities that they couldn’t access from India.

The deal’s going through Serum Life Sciences, a UK branch of Serum Institute of India. Besides the mansion, there’s also an adjoining guest house and access to one of Mayfair’s exclusive ‘Secret Gardens’.


This mansion’s jaw-dropping price of £138 million puts it as the second most expensive house ever sold in London. The top spot, at £210 million, still belongs to 2-8a Rutland Gate from back in 2020.

Where did Poonawalla get this prime property? From Dominika Kulczyk, a billionaire from Poland.

So, Poonawalla’s making a hefty investment in a London property to give his company and family a swanky place to stay and make connections when they’re in the UK.