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!

Brent Thiessen | Sage Door Group Owner / Project Manager

Brent Thiessen

 Owner/ Project Manager

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Brent Thiessen is the Co-Owner and Project Manager at Sage Door. He was born and raised in Littleton, Colorado, and attended the University of Northern Colorado where he played hockey and baseball and received his bachelor’s degree in Finance. Brent has an extensive professional background in sports management which spans over the past two decades, including prominent roles such as the Chairman of the ECHL, President and General Manager of the Missouri Mavericks Hockey Organization, Director of Corporate Marketing for the NHL’s Florida Panthers, President of the Arizona Sundogs hockey team, and Vice President of the Colorado Eagles hockey team.  After leaving the Mavericks organization in 2021, Brent has played a crucial role in the growth and development of Sage Door. As the Owner and Project Manager of Sage Door, he is a very insightful leader and ensures that things are completed efficiently and to the highest quality of standards. Brent and his wife, Nicki, live in Grain Valley with two of their four children still living at home. Their eldest child works for the US Senate in Washington DC, while the second-oldest lives on the plaza in KC and is the Executive Marketing Analyst for a law firm. Their two youngest children attend Grain Valley Schools and are actively involved in sports such as baseball, soccer, tennis, and basketball. They also have four dogs named Hope, Faith, Grace, and Fred. When not in the office, Brent and his wife enjoy taking summer vacations, attending sporting events, and attending church.

Brian Stanke

VP, Construction and Maintenance 

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Brian Stanke is our company Vice President 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. 

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Adrian Jones

Real Estate Agent
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As a new agent, Adrian is looking to learn something new with each client. With an enthusiastic personality, he is always prepared for whatever task may be thrown at him. When becoming an agent, his goal was to assist and guide people through some of their larger and most important investments. When he is not in the office, Adrian enjoys going on runs, hanging out with friends and family, and going to the gym. Fun fact: His body has a built in alarm clock! 

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Jaren Stutzman

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Jaren is extremely driven with high energy and passion for the game of baseball. He has a large history with the game, with 6 years of coaching college ball, 5 high school, and 8 years of working with major and minor league players during their off-season. He attended Adrian College to play baseball and majored in Elementary Education. He also got his masters at the University of Findlay in Human Resources. His goal is to make an impact on as many people’s lives as he can by being able to teach each player life-lessons through the great game of baseball. 

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Krystel Perez

Property Manager – Owner Advocate / Real Estate Agent
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With over 11 years of property management experience from Florida to Missouri, Krystel brings a lot of insight and dedication to her role. Her experience working with Housing Authority and Section 8 as well as conventional multi-family housing have contributed to her knowledge of property management and it’s fast paced processes. Krystel is on the path to becoming a licensed real estate agent in an effort to continue her drive for knowledge in furthering her career here with us at Sage Door.
When she is not working or studying you will find her spending time with her son and fiancé on any outdoor adventure including fishing, hiking, road trips and camping to name a few. Family time also includes game nights or a good movie with their dogs, Clyde and Abba and cat, Lunito.

Steven Sieleman

Field Maintenance Agent

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