About Us

Our Story

Started in 2018, Sage Door Group, LLC is aiming to be the best real estate company in the Kansas City Area. Founded by Owner/Broker Nicki Thiessen, we pride ourselves in being a company that works extremely hard at upholding a reputation of integrity and excellence in our daily practices. Our staff is committed to continuous improvement and education, rolling up our sleeves to get the job done, and being transparent and ethical in all business practices. We believe that housing can affect every aspect of a person’s life and that is what drives us to help people make the best decisions possible for their family. With decades of experience collectively in multiple trades, our staff is not only knowledgeable but also passionate about assisting people in real estate. No matter if you are looking to rent, buy or sell your home, or ready to dive into the investment world; We Have A Door That Fits Your Future.


Nicki Thiessen


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Owner and Broker of Sage Door Group, Nicki Thiessen was driven to create something that would help people find better housing solutions by fronting her company with integrity. More than 20 years ago she began her path in real estate as a mortgage loan processor. With her love of numbers and analyzing data she obtained her Real Estate Appraiser license and started a successful Real Estate Appraisal company in 1998. She sold that business when her family moved but continued in Real Estate, and held her Certified Residential Appraiser License in 5 states; giving her a wide variety of marking conditions. In 2016 Nicki received her Realtor license in the state of Missouri and began flipping houses, purchasing rental properties, and helping friends and neighbors buy and sell their homes. In 2018 she continued her education and has received her Missouri Broker’s License. Her love and passion for everything real estate continues to grow every day and she is excited to share her knowledge with other realtors, investors, homeowners, employees, and anyone who wants to listen!  Nicki and her husband live in Grain Valley and are active in their 4 children’s lives.  Their oldest son attends William Jewell where he plays soccer and is studying law and politics.  Their daughter played hockey at the AAA level for several years, and is now pursuing a career in Real Estate with ambitious goals.  Their youngest 2 children attend Grain Valley schools and are very involved in sports including baseball, Soccer, and basketball.  Nicki and her family enjoy taking summer vacations together, attending sporting events (obviously!),  and just relaxing at home together on rare occasions.  Nicki believes that the foundation of family, business, and all things should be faith in God.  That belief, along with her passion for Real Estate and work ethic created Sage Door Group!

Brian Stanke

VP, Construction and Maintenance 

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Brian Stanke is our company VP and has a passion for fixing things. With over 25 years of experience in the industry he serves our company with knowledge and a friendly smile. Brian is very meticulous with his jobs: making sure every job tied to his name is completed to the absolute best. He seeks out the thrill of being thrifty! When not working on various projects at the office or one of our rental properties he can be found soaking up lake life, or enjoying his Harley Davidson with his wonderful wife Gina, two daughters, and new baby grandson. 

Alicia Sasyk

Operations Manager

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Alicia Sasyk has always had a heart for people. She lives in Blue Springs with her husband and 3 young children. When she isn’t at the office or driving around the little ones to activities and sports, she will typically be found serving at her church in youth ministry, and in missions; both local and abroad. Alicia and her husband have traveled on multiple missions trips to South America where she fell in love with other cultures. Her fun and energetic spirit will make you feel like you have a friend on the inside of the real estate world to help you through a sometimes stressful process!

Katie Thiessen

Administrative Assistant

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Katie is our Administrative Assistant and will be the smiling face that welcomes you to our office when you stop by! Katie played AAA ice hockey up until 2017 and currently has two cats named Calvin & Killer who were both rescued. When she’s not in the office or playing with her cats, you can find Katie hanging out with her friends or at the gym doing arm day.

Steven Sieleman

Field Maintenance Agent

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As a Field Maintenance Agent, Steven is the helping hand to all our tenant’s maintenance needs. Steven and his wife Holly live in Independence with their 3 dogs Teddy, Annie, and Molly. He holds a degree in criminal justice with emphasis in law enforcement from College of the Ozarks. In his free time, Steven enjoys local sports, outdoors, hunting and fishing.

We Have A Door That Fits Your Future