Marcus Mahlen, CCIM, SIOR
President
NAI Sioux Falls
605 228 9744
mmahlen@naisiouxfalls.com
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Clients Represented
- Arise Church
- Dakota Holdings, LLC
- Essex Corporation
- First Interstate Bank
- Reikes Equipment
- Signature Companies
- Sioux Falls Audiology
- Associates
- Startup Sioux Falls
- Sterling Trust
- Chad Javers Construction Inc
- Lake Area Improvement Corp.
- Midwest Fidelity Partners
“Marcus did a fantastic job working with myself and the tenant to get a deal done that worked for all the parties involved. He was upfront and transparent about all the details regarding my commercial building. Very detail oriented and timely.”
Jason B.
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 the firm. Marcus’ accomplishments include being involved in the Deal of the Year for 2018 & 2023, and being named the Broker of the Year in 2022, 2023, & 2025.
Marcus has completed nearly over 450 sales and leases on behalf of his clients through 2025. These transactions have totaled over 3.44M square feet of building area, over 18.52M square feet (+/- 425 acres) of development land, totaling nearly $225M in sale/lease value. His expertise primarily involves investment sales and leasing in the industrial, office, retail, and land asset classes.
In 2024, Marcus started a podcast with his wife Alexis called 605 Founders. where they interview founders & executives based in South Dakota.
Personal
Marcus Mahlen, a fifth-generation South Dakotan from Webster, is deeply rooted in both his professional and personal life in the Sioux Falls community. He is married to Alexis Mahlen, a fellow commercial real estate broker. The couple has three sons: Jack, born in July 2021, Miles, born in May 2023, and Louie born April 2025.
Education
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 received his CCIM Designation in April of 2019.
Marcus received his SIOR Designation in September of 2022.
Professional Affiliations & Designations
- Licensed Real Estate Broker, State of South Dakota #16852
- SIOR (Society of Industrial and Office Realtors)
- CCIM (Certified Commercial Investment Member)
- International Council of Shopping Centers Member
- Minnesota/ Dakotas CCIM Chapter, Member
- Siouxfalls.Business 2023 30 Under 30 Read the Story Here
Community Involvement
- Harrisburg Economic Development Corporation Board Member (Dec. 2019 – Present) Vice Chair (Dec. 2022 – Dec. 2023) Chair (Jan. 2024 – present)
- Downtown Sioux Falls Rotary – Past Programming Committee Member
- Sioux Metro Growth Alliance Board Member (Mar. 2024 – Present) Vice Chair (Jan. 2025-Present)
- Sioux Falls Area Chamber of Commerce Issues Management Council Member
- South Dakota Historical Society Foundation Board Member (Jan. 2024 – Present) – Development Committee Chair (June 2025 – Present)
- Junior Achievement Volunteer (7 years & counting)
- Southeastern Development Foundation Board Member (Jan. 2021 – Dec. 2023)
- Sioux Falls Area Young Professional Network Steering Committee Board Member (Oct. 2017 – Oct. 2023)
- Vision Sioux Falls Strategic Council Member (2022 – 2023)
- YPN Civic Engagement Committee Co-Chair (May 2018 – May 2022)
- Sigma Alpha Epsilon Sioux Falls Area Alumni Association President (June 2017 – June 2022)
- Leadership South Dakota Class of 2019 Graduate
- Yelduz Shriner
- University of South Dakota 30 Under 30 Honoree (2018)
- 2018 Sioux Falls School Board Facilities Task Force Member
- Sioux Empire United Way Emerging Leader Board Member (May 2018 – May 2020)
- 2018 Sioux Council Friends of Scouting Co-Chair
- Sioux Council Executive Board Member (Nov. 2019 – Nov. 2020)