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About Marcus O'Brien

Marcus

Agent Details

Meet Marcus

Marcus O’Brien is a trusted advisor to ultra-high-net-worth clients, known for handling some of the United Kingdom’s most significant residential transactions. Over the past decade, he has represented record-breaking sales, including the highest-priced residential property and the most valuable rental contract in British history. Respected by leading private banks, family offices, and law firms, Marcus is recognized for his discretion, strategic insight, and ability to deliver measurable value.

His refined, relationship-driven approach ensures clients receive expert guidance and exceptional representation at the highest levels of the luxury market.

My Portfolio Collection

Manresa Road, London, ENG
For Sale

Manresa Road, London, ENG

6 Beds | 6 Baths | 8,155 Sq.Ft.
$50,720,800
Ormonde Gate Chelsea, London, ENG
For Sale

Ormonde Gate Chelsea, London, ENG

6 Beds | 6 Baths | 5,425 Sq.Ft.
$28,697,300
Lyall Street, London, ENG
For Sale

Lyall Street, London, ENG

5 Beds | 4 Baths | 5,456 Sq.Ft.
$22,624,100
Charles Street, London, ENG
For Sale

Charles Street, London, ENG

6 Beds | 5 Baths | 7,511 Sq.Ft.
$19,954,600
Eaton Square, London, ENG
For Sale

Eaton Square, London, ENG

4 Beds | 3 Baths | 4,015 Sq.Ft.
$15,950,300
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Contact Details

Sotheby's International Realty Market Leaders

At this level, nothing is casual. Every decision is calculated, every move is intentional, and every relationship must add measurable value. You’re not looking for someone to simply open a door. You’re looking for someone who knows which door matters, how to get you there first, and how to secure it on terms that protect both your asset and your objectives. That is what a Market Leader delivers.

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By providing your contact information to Sotheby's International Realty Market Leaders, your personal information will be processed in accordance with Sotheby's International Realty Market Leaders's Privacy Policy. By checking the box(es) below, you expressly consent to receive marketing or promotional real estate communication from Sotheby's International Realty Market Leaders in the manner selected by you. For SMS text messages, message frequency varies. Message and data rates may apply. Consent is not a condition of purchase of any goods or services. You may opt out of receiving further communications from Sotheby's International Realty Market Leaders at any time. To opt out of receiving SMS text messages, reply STOP to unsubscribe. SMS text messaging is subject to our Terms of Use.

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