Domain Completes Acquisition of Simpson Property Group
Simpson's residential arm holds more than 23,000 multifamily units.
Domain Capital Group has closed on the acquisition of Denver-based Simpson Property Group for an undisclosed price. The State of Michigan Retirement Systems sold the firm for an undisclosed price.
Simpson is a commercial and multifamily property management, development and construction firm. The company’s residential arm, Simpson Housing, is one of the largest privately held residential developers and managers in the nation, holding more than 23,000 multifamily units.
Simpson will continue to operate under its established brand, led by current CEO Frank Rooney Jr. and the existing executive staff. Day-to-day operations are expected to continue uninterrupted, with Domain’s acquisition providing additional resources to facilitate Simpson’s further growth.
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Domain plans, along with Simpson’s executive team, to expand its institutional investment offerings, including new commingled fund vehicles and separately managed accounts for institutional investors. Domain says it will also support continued portfolio expansion in targeted U.S. markets.
Simpson has holdings from coast to coast, including sizable portfolios in Southern California, Texas and the Mid-Atlantic region. Domain has about $8.3 billion in assets under management, including more than 41,500 apartment units.
The companies are no strangers to each other. Senior executives at Domain first began advising Simpson more than 30 years ago, during their time at PwC. Domain has served as Simpson’s investment advisor, overseeing the latter firm’s operations and investment strategy, since 2008.
M&A gains steam, including landlord deals
The U.S. mergers and acquisitions market regained momentum in the fourth quarter of 2025 after a mid-year slowdown, reaching $23.5 billion in announced deals. This pushed full-year activity to $65 billion, analytics firm Enverus reported.
The Domain-Simpson deal comes on the heels of another major merger among residential landlords. In February, a group of investors led by Affinius Capital and Vista Hill Partners acquired Veris Residential in a $3.4 billion, all-cash transaction. Veris had previously spent years transforming itself into a pure-play multifamily-focused REIT, selling off its office assets.
