Brennan Investment Group is a Chicago-based private real estate investment firm founded in 2010 by Michael Brennan and Kevin Brennan. Michael Brennan previously co-founded and served as CEO of First Industrial Realty Trust from 1994 to 2008 before launching Brennan Investment Group. The firm operates as the second-largest privately held industrial real estate owner in the United States. The company's portfolio spans approximately 57 million square feet across 29 states, representing over $6.5 billion in assets under management. Since inception, Brennan has been involved in over $20 billion in industrial real estate transactions. The firm's investment strategy focuses on acquiring, developing, and operating industrial properties through multiple channels, including shallow-bay facilities, multi-tenant portfolios, corporate real estate acquisitions, build-to-suit developments, and sale-leaseback transactions. Brennan targets functional industrial assets in land-constrained, high-growth markets with transaction sizes ranging from $5 million to $1 billion. The company operates with regional offices across 14 markets and maintains a 96.4% occupancy rate as of August 2025. Brennan co-invests with private and institutional capital partners to achieve risk-adjusted returns for investors.