Mark O'Brien

Mark

Mark O’Brien is the Sales Manager of Richardson & Wrench Castlecrag, a licensed real estate agent and one of the Lower North Shore’s most respected property professionals.

The key to Mark’s success is a genuine enthusiasm for working with people, which is reflected in his outstanding achievements. After spending his formative years in the racing industry as a horse breaker and trainer, Mark decided in 1983 that real estate offered him the opportunity to apply and develop his interpersonal skills to their full potential.
Mark joined Richardson & Wrench Northbridge & Castlecrag in 1992 and quickly established himself as the area’s premier agent. He believes the Lower North Shore, in particular the Middle Harbour peninsula suburbs, offer unique features and therefore demand specialist attention, which is where Mark feels his experience and expertise often result in record breaking prices and testimony to these results are a string of outstanding Sales Awards.

Mark recognizes that being entrusted with a family’s major transaction is indeed a great responsibility and one which is treated with the utmost professionalism, dedication and care.

Where to from here

Mark O'Brien

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Properties

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FAQ

Do I need to be there for open homes or inspections?

Not at all. We’ll handle everything professionally, respecting your time and space while ensuring buyers feel welcome and informed.

How should I prepare my home for sale?

Presentation matters. From minor touch-ups to expert styling, we’ll guide you on how to showcase your home in its best light—inside and out.

What should I look for in a real estate agent?

Experience, communication, and local knowledge count. You want someone who listens, guides you with honesty, and knows how to get results—now and always.

What’s a property appraisal, and why does it matter?

A professional appraisal gives you a clear understanding of your home’s current market value—an essential first step in planning your sale with confidence.

When’s the right time to sell?

The ‘perfect’ time depends on your property, your goals, and the market. We’ll help you weigh the factors and decide what works best for you.

Will I need to pay Stamp Duty?

Stamp Duty usually applies to buyers, but rules can vary. We can connect you with trusted legal and financial advisors to make sure everything’s covered.

‘What’s the best way to market my property?’

The best marketing strategy is one that’s tailored—to your home, your audience, and the current market. It’s not about ticking boxes; it’s about standing out where it matters. That means combining strong digital reach with compelling visuals, authentic storytelling, and targeted strategy. If you’re thinking about selling Talk to us today.

DON’T MISS A MOMENT.