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Company

Sotheby’s International Realty

Position

Head of department

Index

Property Brokers

Location

London

Advice type

Lettings

Property buying

Property selling

Asset Class

Prime property – London

Real estate

Residential

Client type

Celebrities

Family offices

HNW

UHNW

Sector Focus

Real Estate

Marcus O'Brien

Spear’s Review

Marcus O’Brien has brokered three of the five most expensive residential property transactions ever recorded, including the sale of Providence House, Chelsea, for more than £270 million in 2026, the most valuable private residential sale completed globally, and 2-8a Rutland Gate, Knightsbridge, for £225 million. His record also includes The Holme in Regent’s Park. In addition, O’Brien reports having secured what is thought to be Britain’s most significant rental contract. 

He acts for a small number of clients on acquisitions, disposals and long-term investment strategy, in a market where discretion is as much the service as the result.

Alongside his role as the head of the family office division at UK Sotheby’s International Realty, O’Brien is the founder of OBVC, which backs early-stage technology companies, including those changing how property is bought, financed and managed.

Read next: UK Sotheby’s International Realty launches one-stop-shop family office division

Rank: Top Flight

Top Flight 2026, Property Brokers

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