Marcus Mahlen, CCIM

Office: (605) 444-7116

Fax: (605) 357-7102

Mobile: (605) 228-9744

Scope of Service

Marcus Mahlen joined NAI Sioux Falls in February of 2017 as a broker associate. Since the beginning of his time at NAI Sioux Falls, negotiating his first deal at the age of 23, Marcus has shown a passion for putting his client first. His  strong work ethic and ability to form strong personal connections in the community has allowed him to work on a number of significant projects for NAI Sioux Falls, including being involved in the Deal of the Year for 2018.

Marcus has completed nearly 100 sales and leases on behalf of his clients through 2019. These transactions have totaled nearly $1.25M square feet of building area, and over $45,500,000 in sale/lease value. His expertise primarily involves investment sales and leasing in the retail, office, & industrial asset classes.

Education & Professional Experience

Marcus received his Bachelor of Business Administration with an emphasis in Business Marketing from the University of South Dakota in May of 2015.  He also received a minor in Political Science.

In June 2018, Marcus attended NAI University in Baltimore, MD, completing and receiving his MiCP designation – Masters in Commercial Property from The Lipsey Company.

Marcus also received his CCIM designation in April of 2019. The CCIM designation is the most prestigious designation to receive in the field of Commercial Real Estate. It involves four core education courses:

  • CI 101: Financial Analysis of Commercial Investment Real Estate – Completed June 2017
  • CI 102: Market Analysis for Commercial Investment Real Estate – Completed September 2017
  • Negotiations Training: CCIM Interest-Based Negotiations Model – Completed April 2018
  • CI 103: User Decision Analysis for Commercial Investment Real Estate – Completed April 2018
  • CI 104: Investment Analysis for Commercial Investment Real Estate – Completed August 2018
  • Online Ethics Course – Completed January 2019
  • Comprehensive Course Review & Final Comprehensive Exam – Completed April 2019

Professional Affiliations & Designations

Community Involvement

  • Leadership South Dakota Class of 2019 Graduate
  • University of South Dakota 30 Under 30 Honoree (2018)
  • Sioux Falls Area Young Professional Network Steering Committee Board Member (October 2017 – Present)
  • YPN Civic Engagement Committee Co-Chair (May 2018 – Present)
  • Sioux Falls Area Chamber of Commerce Issues Management Council Member (June 2018 – Present)
  • 2018 Sioux Falls School Board Facilities Task Force Member
  • Sigma Alpha Epsilon Sioux Falls Area Alumni Association President (June 2017 – Present)
  • Sioux Empire United Way Emerging Leader Board Member (May 2018 – Present)
  • 2018 Sioux Council Friends of Scouting Co-Chair
  • Active Yelduz Shriner
  • Sioux Council Executive Board Member (November 2019 - Present)
  • Harrisburg Economic Development Corporation Board Member (December 2019 - Present)

What People Are Saying About Marcus

"We needed a specific type of warehouse space, Marcus continued searching until he found one that worked for our needs. He is a true professional."  

Keith Auch
Reclamation Technologies, Inc

"When it comes to real estate deals, my office was small potatoes. Even though the deal was not big, and the negotiations were a little tense, Marcus was cooler than a trillion ton iceberg and got the deal everyone was happy with."

Josh Tordsen
Gigastrand Technologies

"As a church we have very specific needs, strict budgets, and lots of red tape to get through when it comes to real estate transactions. Marcus and NAI were phenomenal every step of the way - they were patient, easy to work with, and got things done promptly. We couldn't have had a better experience."


Jeff Mueller, Pastor

Restore Church - Yankton

Jeff Mueller, Pastor
Restore Church - Yankton

“I had been searching for the right office for my small business for several months and had worked with a few different property management companies without any success. That was until I worked with Marcus [Mahlen]. Marcus took an entirely different approach from other commercial real estate brokers and took the time to precisely understand what our needs were and provided an office solution that exceeded my expectations. What is more, Marcus made the entire process of leasing an office space straight forward and effortless. I could not recommend Marcus and NAI highly enough." 

Nathan Fredrickson
EPI - Director of Investigations & Risk Management

“Our Church made a difficult decision to not build a new building but rather look for an existing building or space to remodel instead.  Finding an existing building or space to fit a church can be extremely difficult.  Marcus took the time to listen to the specific needs and wants of the church before attempting to locate properties.  That approached help narrow the search for him and helped us keep an open mind on the options presented.  In the end we found the right fit and Marcus made it happen.  We are very appreciative of Marcus’ thorough approach and professionalism.” 

Galen Van Otterloo
Arise Church

"Thank you Marcus for your efforts on the sale of our property in Ipswich SD. NAI of Sioux Falls, and yourself, were a great team to help us with this sale. Everything was very professional, and the communication was superb. It is so nice to get answers when needed, and in a timely manner. We will certainly use you in our next need for selling one of our properties. I will not hesitate to refer you to anyone looking for help as well!"

Dirk Swanson
Double L Investments - Aberdeen, SD

“Marcus was informative and kept us in the loop throughout the whole process, which made the transaction that much easier. We couldn’t have asked for a better agent!”

Mandy Rounseville
Sioux Falls Audiology Associates

"Marcus is a true team player that puts client needs over his own! I had a tight timeline to find an office and not much knowledge of downtown office space and what I actually wanted or needed. However Marcus made himself available immediately and he quickly understood my needs, making them his focus. Even though the properties he was currently responsible for didn't meet my needs, Marcus made sure that NAI did by unselfishly connecting me with another team member who represented a more appropriate space. His market knowledge, willingness to collaborate, and focus on understanding/meeting client needs with urgency really simplified the process for me. I would highly recommend Marcus!"

Brandon Eastman
Top Talent Connection, LLC

"Marcus did a great job coming up with various options to try to fit our needs and once we zero'd in on an option, he was great at negotiating with the lessor and us for terms that worked for both parties."

Patrick Sweetman

Archit Shah
OrangeTheory Fitness Sioux Falls

Rave reviews for Marcus Mahlen from Emily at Encompass Mental Health, LLC in Sioux Falls. 

Emily Learing
Encompass Mental Health, LLC

Stacey Tieszen
CASA Sioux Falls

Reed Burson
Short Staffed, Inc.