Vivmark Residential is a real estate investment trust (REIT) and S&P 500 company formed through the August 2026 merger of equals between Equity Residential and AvalonBay Communities. The company focuses on the ownership, development, and management of high-quality apartment communities in premier U.S. markets, including major coastal cities and high-growth metro areas. Vivmark's portfolio consists of over 184,000 apartment homes with a substantial development pipeline. [25, 28, 40]