About Mark Middleton

For more than 20 years, Mark Middleton, Managing Partner of The Agency Bainbridge Island, has helped shape the Bainbridge Island and Kitsap County real estate market. Widely recognized as a leading authority on waterfront properties, Mark has established and held multiple all-time sale price records while delivering exceptional results across the region’s diverse communities. With more than $500 million in career sales, he brings an uncommon depth of market knowledge, strategic insight, and negotiating expertise to every client relationship.

A decade-long recipient of RealTrends America’s Best and Washington’s Best Realtors® honors, Mark was Kitsap County’s highest-producing broker by sales volume in 2024 and 2025 and has earned The Agency’s Chairman Award annually since 2024. His approach combines data-driven pricing and positioning with sophisticated local, national, and global marketing strategies. Just as important is his ability to navigate complex negotiations with preparation, perspective, and conviction—recognizing opportunity, protecting his clients’ interests, and pursuing the strongest possible outcome.

A nearly lifelong Bainbridge Island resident, Mark possesses an intimate understanding of the region’s communities, waterfront, and evolving market dynamics. Alongside his wife, Suzy Legier Middleton, he owns and leads The Agency Bainbridge Island and The Agency Port Townsend. At the heart of his business is a collaborative approach to real estate, built around the belief that exceptional results come from bringing the right expertise together at every stage of the process.

Mark leads a dedicated team whose combined strengths extend well beyond the transaction itself. Suzy, a Master Stager, brings design vision and staging expertise to help clients present their properties to their fullest potential. Amber Wong contributes extensive real estate experience through strategic oversight, marketing, and operational leadership, while Shannon Morgan coordinates listing preparation and execution with thoughtful attention to detail. Together, they unite local knowledge, considered strategy, distinctive property presentation, and coordinated service in support of each client’s goals

For Mark, exceptional representation begins with understanding what matters most to each client. Every property, financial decision, and next chapter comes with its own considerations, and he approaches each with the same commitment to preparation, sound strategy, and thoughtful negotiation. Whether representing a landmark waterfront estate, advising on a strategic sale, or helping a homeowner navigate a significant transition, Mark brings the experience to recognize opportunity, the perspective to guide important decisions, and the conviction to advocate for his clients’ best interests.

His nearly lifelong ties to Bainbridge Island have shaped not only his understanding of the market, but also his appreciation for the people and relationships that make this community distinctive. He believes exceptional service is measured not simply by the result at closing, but by the confidence clients have in the decisions they make along the way—and the trust that remains long after the transaction is complete. A former board member of the Kitsap County Association of REALTORS® and a steadfast supporter of local charitable organizations, Mark leads with integrity, conviction, and a genuine commitment to the community he serves.