Fionnuala O’Sullivan

Fionnuala has sold four of our homes over the past 8 years. All have been well priced and have sold within the first three days of listing! Fionnuala is respectful of her client’s wishes, and never pushes her agenda. She is patient, very friendly and easy to work with. She is knowledgeable about staging, obtaining workers to fix up your house, and how to present your home in the best possible light. She is just the best! 

– Mary E.

Fionnuala was recommended to us by a friend who always uses her. And we know why – she was fabulous. Everything went smoothly, she was always available, knew the answers to our questions (and if she didn’t she found out) and a joy to work with. We strongly recommend her. 

Band K.

If I had only word to describe Fionnuala’s knowledge, high level of service, professionalism, and attention to detail, that word would be, “Outstanding”. In helping us find and purchase the perfect home there was absolutely nothing she could have done better. It is rare that I can say this about anyone. She left us alone when needed and was immediately in the trenches with us when needed. She is second to none. 

Chris S.
Fionnuala O’Sullivan

Fionnuala O’Sullivan

Designated Broker – Owner


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Born in Africa and raised in Ireland, I have been a Seattle resident since the early 1990s. I am an owner and the Designated Broker of GBK Realtors: an independent, full service company and one of Seattle’s most successful brokerages. I am a full-time professional Broker with two decades of experience. Today’s Real Estate market is fast moving and complex. I have the expertise and experience to help you navigate it.

My number one goal is to help my clients successfully navigate the process of buying or selling a home. By choosing to work with fewer clients, I can offer a personalized service and my undivided attention, which allows my client base to remain largely referral based.

I strongly believe that any good relationship is built on trust. Buying or selling a home can be an extremely personal and sensitive process, and is best achieved within a collaborative, understanding environment.

GBK has a significant percentage of the luxury market. We are a member of Who’s Who in Luxury Real Estate: a compendium of the finest residential real estate firms and brokers that collectively sells over $300 billion of real estate annually both nationally and internationally.

Community involvement is important to me. I have served on many boards and as a volunteer. I donate a portion of my commission to a local non-profit.

My clients (and their families) typically use my services for every real estate transaction that they consider, or actually engage in. I have been through many housing cycles and look forward to discussing your Real Estate needs with you.

Experience- I have been in this industry for almost two decades. Buying or selling a home is a huge financial decision and I have a breadth of knowledge that I will put to work for you.

My client list is largely referral based and I am always happy to discuss your real estate needs! Thank you to all my clients who have been part of this success.

Fionnuala's Featured Sales