Fionnuala O'Sullivan

Fionnuala O'Sullivan

Designated Broker - Owner

Fionnuala O'Sullivan

Designated Broker - Owner



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.

Gerrard Beattie & Knapp

Fionnuala O'Sullivan
Click To Show Phone
Main: +1 206 779 4643

1313 East Pine Street
Seattle, Washington 98122
United States

Gerrard Beattie & Knapp
Click To Show Phone
Main: +1 206 322 8940
Fax: +1 206 328 4716


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  • 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.

    chris90127 — Feb 07, 2017

  • Fionnuala was so wonderful to work with, she made the whole process of buying a home so painless. I felt like Fionnuala was readily available and never made me feel like I was an idiot or a pest! She is incredibly knowledgeable and professional and I would work with her again in a heartbeat.

    sdiffe — Jun 02, 2016

  • We live in Australia and everything was done electronically (phone, web and e-mail) and with a seven-hour time difference. Our questions and concerns were responded to immediately and ways around glitches (ie when the signing software decided not to work properly) were promptly found. 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. The condo went on the market on Friday and the following Wednesday we had two offers. A month later the sale was complete with not a bump along the way

    bandk41 — Aug 10, 2015

  • Fionnuala is the best agent I have ever worked with and I have worked with 3 very experienced realtors in the past. She is energetic, accommodating and always on the top what it takes to close a sale in the Seattle market.

    user41827746 — Aug 07, 2015

  • Fionnuala helped us find a home during the peak of the roughest market possible--extremely low inventory. She learned our desires quickly and guided us to the types of home we desired efficiently. We were coming from Eugene, so she put together lists of places that had a shot with us, and we came up to Seattle when it was worthwhile. More than once, as we got more desperate, she cautioned us against homes that she thought were overpriced, even thought it would have meant more money for her. We finally found a place off market. She guided us through the grueling process with lenders, even negotiated with the builders on a few items, until our dream house was finally ours. She is smart, fun and wears snazzy hats and shoes. With her, even our kids enjoyed house hunting (and that's saying a lot!) We're so thankful to have found her

    middledog99 — Jul 09, 2015

  • We had a very unique large property to sell that included a historic home and build-able in-city land. Fionnuala went above and beyond the typical sales plan to research and analyze appropriate value with several specialized agents in her network and to come up with a strategic plan that fit our situation. It payed off to our advantage with a very quick sale at a price that certainly exceeded our expectations We turned around to buy in an extremely competitive market with very low inventory and her expertise paid off for us again. After months of looking we finally found 'the one' and followed her advice putting together our offer. Much to our delight ours was selected over multiple other offers and we now have the kind of home we only thought we could dream about. Aside from the fact that her extensive experience and professionalism worked to our financial advantage in both cases, her personality is also the winning and rare combination of warm, patient, charming and yet business like and even aggressive at the perfect moments that is needed. She is a working mom just like me but was somehow always available day or night. We have already recommended her to anyone who will listen. We already miss talking with her every day!

    zuser20140505220642416 — Jun 06, 2014

  • Fionnuala was the best!!! We went to an open house and met a couple that decided not to put a bid on a house that we wanted to and they recommended Fionnuala. We had been working with several Redfin agents, and once we met up with Fionnuala, we knew we would not be using Redfin any longer. She is personable and constantly plays devils advocate. She was always available and responsive. She did a lot of same day showings. The experience was better than we excepted and I highly recommend her.

    user8086825 — Aug 06, 2013

  • I just sold my house in Seattle and could not have asked for better service and representation than I received with Fionnuala O' Sullivan. First off, I live out of state. Fionnuala took care of each and every on-site detail necessary, from picking up the keys from the renters and looking over the house, to in installing a C02- alarm, evaluating what services were needed, recommending services and reviewing the results, going to the house to turn lights on and off, reading meters, ect.. Each time I approached her with a request her response was always " no problem", and it was taken care of. While the above is one aspect of excellent service, we all want a realtor who can sell houses and close deals. Fionnuala laid out her plan for selling my house and it sold in 10 days. I'm not aware of everything she did, but I know that she hired a professional photographer, accurately described my home in the MLS, and held at least two open houses. She was diligent about every aspect of the paperwork being in order before we went on the market and followed through with me until it was. When we received an offer, all I can say is that I am so thankful that it was she who was representing me because her negotiation skills must be as exceptional as her results. We were under contract in less than two hours with an offer that exceeded my greatest expectations. Finally, Fionnuala never stopped representing me until after the deal was closed. She was informed, and in contact with me every step of the way( including when she was out of town) until, and even after, we closed the deal. I can easily say that working with Fionnuala I had an excellent experience, in addition to having amazing representation and most importantly......results!

    user2464284 — Aug 03, 2013