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Detroit Office
2 Towne Square
Suite 450
Southfield, MI 48076
Office: (248) 415-2600

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Seth I. Barnett

Senior Managing Director Investments

Seth I. Barnett is part of the Affordable Housing Advisors (AHA), a specialty group of Marcus & Millichap that represents sellers and buyers of government-subsidized, multifamily properties. Seth oversees sales in the Midwest, West Coast, Mountain, Sunbelt and Southwest regions and also works with clients throughout the United States.

Seth joined AHA in 2006 and has been an integral part of the firm’s success, which includes a track record of over 250,000 units of government-subsidized, multifamily properties with an aggregate value of over $15 billion. Seth has represented clients ranging from original developers of individual Section 8 properties to institutional clients maintaining large portfolios.

Seth is a member of the National Multi-Housing Council (NMHC), a supporter of the Institute for Responsible Housing Preservation (IRHP), the National Leased Housing Association (NLHA) and the National Housing and Rehabilitation Association (NH&RA). In 2018, Midwest Real Estate News Magazine honored Seth by including him in their Commercial Real Estate Hall of Fame. Seth was inducted into Marcus & Millichap’s Chairman’s Circle of Excellence in 2020 and earned this achievement, yet again, in 2021. Additionally, Seth received Affordable Housing Finance's 2020 Young Leader Award.

License: MI: 6501346607


  • Chairman's Circle of Excellence (CCOE): 2022, 2021, 2020
  • Chairman's Club (CC): 2022, 2021, 2020, 2019, 2017
  • National Achievement Award: 2022, 2021, 2020, 2019, 2018, 2017, 2016, 2015, 2014, 2013, 2012
  • Sales Recognition Award: 2023, 2022, 2021, 2020, 2019, 2018, 2017, 2016, 2015, 2014, 2013, 2012
  • SIA Induction: 2014
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