PS Business Parks, Inc. is a real estate investment trust (REIT) which owns, acquires, develops and operates commercial real estate properties, especially multi-tenant flex, office and industrial. Flex space is defined as properties that are configured with a combination of office and warehouse space. These spaces can be designed to fit a number of uses, such as light manufacturing, office, showroom, laboratory, assembly and warehouse. The company's multi-tenant commercial properties are positioned in markets that have witnessed long-term economic growth. Also, there is a certain concentration on small and medium-sized customers.