If the attic or garage are packed, Public Storage can help. The real estate investment trust (REIT) is one of the largest self-storage companies in the US. It operates more than 2,250 storage facilities comprising some 146 million sq. ft. of storage space in the US and more than 190 facilities in Europe (through its Shurgard Europe affiliate). The firm's self-storage properties, located in densely populated areas, generate more than 90% of the company's sales. Public Storage, which was founded in 1980, also rents trucks, and sells moving supplies such as locks, boxes, and packing supplies. It also owns part of publicly traded PS Business Parks, an office building REIT.