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Meet Diane

For Diane B. Tien, real estate is more than transactions — it's about people, potential, and solving intricate puzzles with both precision and heart. A top producer three years running, Diane offers an exceptional blend of strategic insight, expert negotiation, and genuine care that sets her apart in today’s market.

Diane 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 explored the emerging role of cryptocurrency in real estate. Her background spans technology, art history, start-up culture, and international travel — equipping her with a uniquely analytical and human-centered approach.

Whether working with first-time buyers, navigating complex relocations, or advising sellers on maximizing their home’s value, Diane listens deeply, thinks critically, and advocates fiercely on behalf of her clients.

PORTFOLIO

Exceptional Homes, Expertly Presented

Portfolio

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.

Real Estate Services

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Selling for Maximum Value

Selling for Maximum Value

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Let's Connect

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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.

Local Knowledge. Global Perspective.

Explore Mercer Island & Beyond

From the quiet charm of Mercer Island to the vibrant energy of Seattle and the Eastside, Diane offers insight that goes beyond ZIP codes — helping you find not just a house, but a lifestyle that fits.

  • Mercer Island
  • Medina
  • Bellevue
  • Beaux Arts Village
  • Seattle
  • Sammamish
  • Issaquah
  • Kirkland
  • Redmond
  • Woodinville
Instant property Valuation

Have Diane's Team Help You Find Out What Your Home is Really Worth Today

Discover your property's value through our accurate evaluation and tailored insights. 

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We'll be in touch with your free personalized report. It'll compare your home to nearby properties, taking into account market conditions, location, and features to accurately determine its value.
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