PS Business Parks, Inc.
Market cap: $5,162,187,725
PS Business Parks, Inc. is a fully-integrated, self-advised, and self-managed real estate investment trust, which engages in the ownership, operation, acquisition, and development of commercial properties, primarily multi-tenant flex, office, and industrial space. Its commercial real estate properties include warehouse and office space. The company was founded in 1986 and is headquartered in Glendale, CA.