Macerich is a self-managed real estate investment trust (REIT) that focuses on the acquisition, leasing, management, development and redevelopment of regional malls throughout the United States. The company was founded in 1964 and is headquartered in Santa Monica, California. Macerich owns interests in 47 regional shopping centers, including 42 wholly owned centers and five centers in which it holds partial interests. The company's portfolio includes over 50 million square feet of leasable space.