Domain Capital Group Acquires Simpson Property Group, Expanding Multifamily Real Estate Platform

ATLANTA — Domain Capital Group has completed its acquisition of Denver-based Simpson Property Group from the State of Michigan Retirement Systems (SMRS), the Atlanta-based investment management firm announced March 9, 2026. The acquisition marks a strategic shift for Domain, expanding its role from long-standing investment advisor to direct owner of one of the nation's largest privately held multifamily real estate platforms.

Simpson Property Group is a fully integrated real estate firm providing services in commercial and multifamily property management, real estate development, and construction. Headquartered in Denver, Simpson Housing and Simpson Property Group were established to build and operate quality residential communities and have since grown into one of the largest privately held residential developers and managers in the United States, operating across key markets nationwide.

A Three-Decade Relationship Formalized

Domain's relationship with Simpson spans more than 30 years. Senior executives at Domain first began advising Simpson during their time at PwC. Since 2008, Domain has served as investment advisor to Simpson on behalf of SMRS, overseeing operations and investment strategy across the multifamily platform.

"We are incredibly excited to formalize what has already been a deeply integrated and successful partnership," said Patrick R. Leardo, CEO of Domain Capital Group. "We are grateful for the trust The State of Michigan Retirement Systems has placed in Domain over many years and appreciative of the collaboration with Simpson's leadership team. This transaction reflects our shared confidence in the platform and its long-term growth trajectory."

Frank Rooney Jr., CEO of Simpson Property Group, added: "We are thrilled to be working even more closely with Domain as we enter this next chapter of growth. Its long-standing involvement with our platform provides continuity and alignment, and we look forward to expanding our investment capabilities while continuing to deliver exceptional service to our residents and institutional investors."

Scaling a Vertically Integrated Multifamily Platform

With the acquisition complete, Domain intends to work alongside Simpson's existing executive team to expand institutional investment offerings, including new commingled fund vehicles and separately managed accounts for institutional investors. The firm said it will seek to enhance capital formation capabilities, broaden investor access, and support continued portfolio expansion across targeted U.S. markets.

Simpson will continue to operate under its established brand and disciplined investment philosophy, led by Rooney and the existing executive team. Day-to-day operations are expected to continue without interruption. Domain said the acquisition is expected to provide additional strategic resources, capital flexibility, and long-term alignment to support growth initiatives.

The move reflects Domain's stated commitment to growing its real estate platform through vertically integrated operating businesses with strong institutional pedigrees.

Simpson Property Group: A National Multifamily Operator

Headquartered in Denver, Colorado, Simpson Housing has built its reputation on disciplined site selection, resort-style amenities, thoughtfully designed residential buildings, and a service-first approach to resident experience. The company was recognized as a 2025 USA Top Workplaces honoree by USA Today. Since 1948, Simpson's mission of "Commitment to Excellence" has defined its culture and operating philosophy, with the Simpson name becoming synonymous with quality apartment living across the multifamily industry. The company continues to expand its footprint across key U.S. markets.

Domain Capital Group: A Multi-Strategy Platform

Domain Capital Group is a multi-strategy investment management firm serving institutional and private investors, with approximately $8.3 billion in assets under management. The firm invests across private markets including real estate, media, entertainment and technology, timberland and natural capital, and special situations.

Financial terms of the transaction were not disclosed.

Sources

Domain Capital Group — Official Announcement, March 9, 2026