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About Diane Tien

Diane Tien

Diane Tien

For Diane B. Tien, real estate isn’t just about properties — it’s about people, possibility, and solving puzzles with precision and heart.
 
A top producer for three years running, Diane brings a rare combination of deep expertise, strategic negotiation, and genuine care to every client she serves. She holds a Master of Negotiation Certification from Harvard Business School Online and a Certification in Real Estate Finance and Development from MIT, where she also studied Cryptocurrency.
 
With a background that spans technology, art history, start-up culture, and global travel, Diane’s approach is both analytical and human-centered. Whether guiding a first-time buyer, assisting in complex relocations, or advising sellers on maximizing value, she listens deeply, thinks critically, and advocates fiercely.
 
Based on Mercer Island, Diane is deeply invested in her community. She serves on the board of Mercer Island Rotary, is a founding board member of Mercer Island Rowing Club, sponsors Mercer Island Youth and Family Services, and supports a range of efforts to strengthen and enrich lives locally.
 
Outside of real estate, Diane is an accomplished athlete and a believer in lifelong energy. She is a national silver medalist in pickleball, an active tennis player, and embraces challenges with the same passion she brings to her clients.
 
She lives with her three sons and their wonder dog, Kent, and writes about life’s journeys with her sister at Barrett-Sisters.

Contact Details

Email address [email protected]
Primary phone 206.673.7206
Address 7605 SE 27th St Ste 101 Mercer Island WA, 98040
License #21007492
What Clients Are Saying

Testimonials

Hear from the people Diane has guided — through milestones, moves, and meaningful transitions.

"I first met Diane in early 2022, as she was the selling broker on a condo I purchased in Belltown. From the beginning, to this day, Diane remains a consummate professional. She is informed, balanced, kind, intuitive and really works to provide a thoughtful perspective as to what may be the countervailing motivating forces between buyer and seller. Even in the most intense of circumstances, Diane has never wavered from a true sense of kind professionalism. She is the only broker I work with, and that is for a reason. I highly recommend her, and I am no pushover."
"I first met Diane in early 2022, as she was the selling broker on a condo I purchased in Belltown. From the beginning, to this day, Diane remains a consummate professional. She is informed, balanced, kind, intuitive and really works to provide a thoughtful perspective as to what may be the countervailing motivating forces between buyer and seller. Even in the most intense of circumstances, Diane has never wavered from a true sense of kind professionalism. She is the only broker I work with, and that is for a reason. I highly recommend her, and I am no pushover."
Lawrence G.
"Diane helped us buy our first home. We couldn't have dream of a better guide for the experience. She is knowledgeable, generous with her time and expertise, and extremely adaptable to the communication style and home search needs of her clients. She is a tireless advocate, a proactive communicator, and an excellent listener. We were continually bowled over by her integrity and follow-through. She really goes the extra mile and then one more. We would recommend her to anyone— she's not just an incredible real estate agent, but also an incredible person."
"Diane helped us buy our first home. We couldn't have dream of a better guide for the experience. She is knowledgeable, generous with her time and expertise, and extremely adaptable to the communication style and home search needs of her clients. She is a tireless advocate, a proactive communicator, and an excellent listener. We were continually bowled over by her integrity and follow-through. She really goes the extra mile and then one more. We would recommend her to anyone— she's not just an incredible real estate agent, but also an incredible person."
Z
"Diane was simply marvelous! She worked with us from deciding to list through the final sale. She listened to us and counseled us when we needed it. I would highly recommend her for anyone looking for an agent. If we need an agent in the area again, she is the one we will use!"
"Diane was simply marvelous! She worked with us from deciding to list through the final sale. She listened to us and counseled us when we needed it. I would highly recommend her for anyone looking for an agent. If we need an agent in the area again, she is the one we will use!"
Shelia N.
"Working with Diane was a breath of fresh air. She takes her commitment to her clients seriously, and her communication is top notch. Standing by her clients every step of the way, she is a gem of a real estate agent."
"Working with Diane was a breath of fresh air. She takes her commitment to her clients seriously, and her communication is top notch. Standing by her clients every step of the way, she is a gem of a real estate agent."
Janice F.
"We were so lucky to work with Diane! Her responsiveness, attention to detail, and wealth of experience made everything go smoothly. Could not recommend highly enough!"
"We were so lucky to work with Diane! Her responsiveness, attention to detail, and wealth of experience made everything go smoothly. Could not recommend highly enough!"
Harrison O.

Exceptional Homes, Expertly Presented

Featured Listings

Explore standout properties across Mercer Island, Seattle, and the Eastside — curated and marketed with vision and precision.

  • 3208 89th Place SE For Sale

    $2,750,000

    3208 89th Place SE, Mercer Island, WA 98040

    Provided by NWMLS, Realogics Sotheby's Int'l Rlty

    • 5 Beds
    • 5 Baths
    • 3,310 Sq.Ft.
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Based on information submitted to the MLS GRID as of . All data is obtained from various sources and may not have been verified by the broker or MLS GRID. Supplied Open House Information is subject to change without notice. All information should be independently reviewed and verified for accuracy. Properties may or may not be listed by the office/agent presenting the information.

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