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The Team

Successful real estate professionals know they must be collaborative to respond to the 24/7 nature of the business. 


Tyler Koski

Principal Broker


Throughout his life, Tyler has always valued genuine and authentic connections with the people he meets and believes that, in addition to his passion for real estate and the community, this is what stands out to the clients he represents.

Being a real estate agent was a natural move for Tyler’s career. With his expansive background in the industry and his compassionate, genuine personality, Tyler brings a different experience for his clients when buying or selling a home.

Tyler is a native of the Portland area. He grew up in Southeast Portland and graduated from Cleveland High School and later attended the University of Oregon where he received his B.A. in Philosophy. 

In 2013, Tyler joined Proud Ground, the largest Community Land Trust in the Pacific Northwest.  While there, he worked as a Project Manager for home repair & rehabilitation, in addition to serving as their Principal Broker in Oregon and Managing Broker in Washington.

Tyler has expansive experience in buying and selling homes including short sales, foreclosures, and investment properties in Multnomah County, Washington County, Lincoln County, and Clark County.

Tyler knows it’s important to give back to the community. Prior to his time at Proud Ground, Tyler worked as the Club Director for the Boys & Girls Club before going on to work as the Site Supervisor for Multnomah Education Service District’s Outdoor School.  


Crosby Case

Licensed Agent


Crosby Case is passionate about connecting with community members. When it concerns her clients, Crosby believes in a philosophy of transparency. Leading with integrity is how she creates value for her clients and creates a solid foundation to do great business together. A career in real estate is a wonderful way to help meet, unite and work with neighbors, and why Grand Union Real Estate is the perfect place for her. 

Crosby is a 3rd generation Portlander. Growing up in Northeast and graduating from the Japanese Immersion Program at Grant High School, she knows the ins and outs of the city. Crosby understands the passion and care residents have for Portland and the importance of loving where you live. A graduate of the University of Oregon with a B.A. in History and a Master’s of Arts in Teaching from Concordia University led Crosby to a career as an educator.  Teaching in the traditional (Salem-Keizer School District and with Oregon Virtual Academy) and the non-traditional setting (The MESD Outdoor School, The Oregon Zoo and The Oregon Museum of Science & Industry) for over 17 years has truly set Crosby up to connect, relate and assist humans of every age and walk of life.


Crosby has always been very interested in architecture, the design and flow of houses and never missed a biography on Frank Lloyd Wright. As time went on, she realized the aspect of architecture she loved the most was finding spaces that worked for people and their families. With her intimate knowledge of the Portland-Metro area she has the drive and confidence to find the best home for you and your family. Real estate combines Crosby’s passions, experience and ability in one arena.


Michael Harris

Licensed Agent


A Realtor that combines his vast business acumen with superior knowledge of his hometown. What a grand union!


Mike provides a seamless client experience in buying and selling homes built on communication, dedication, fiducial responsibility, and transparency. 

A Portland native, Mike, has always felt a deep connection to the Northwest and loves to share local history and be a defining part in shaping its future. In his early years he was able to join the Boys and Girls Club, meeting lifelong friends, playing sports, and developing the morals that define him today. After graduating from Cleveland High School, he started working at the Boys and Girls Club as summer staff and then was promoted to Athletic Director. It was a tremendous honor to serve the community and be a positive influence with the Boys and Girls Club youth, just as he had experienced years earlier.

While attending George Fox University, Mike worked at Central Drugs Pharmacy. Starting as a Clerk then promoted to Manager of the 100-year-old business. Attending MBA classes in advanced business practices and managing the pharmacy was the merging of “book” education and real-life education that shaped his business acumen. After graduation Mike consulted small business owners as they navigated the struggles of growth, development, and long-term strategies. All while starting his own successful business with those same friends so many years ago from the Boys and Girls Club.

Michael Harris is thrilled to join the Grand Union team. You will see Mike around town with his wife Linda and two kiddos - Lincoln and Henry, maybe the pup Stella will be with them too!

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