These paragraphs are from Wiki.At year-end 2009, a total of some 50,000 self storage facilities, owned by 30,235 companies, have been developed in the United States on industrial and commercial land parcels. There is more than 2.35 billion square feet of self storage in the U.S., or a land area equivalent to three times Manhattan Island under roof. The five large publicly traded storage operators (four REITs and U-Haul) own or operate approximately 9% of self storage facilities. More recently, in many metropolitan cities where competition among storage companies is fierce, better parcels of land near residential and commercial areas are being converted into self-storage once approved by zoning panels.
According to the "Self Storage Demand Study - 2007" (published by the SSA) one in ten U.S. households now rent a self storage unit. The growing demand for self storage in the U.S. is created by people moving (some 40 million Americans move each year according to U.S. Census data), and by various lifestyle transitions, such as marriage, divorce, retirement, a death in the family, etc.
The next time you get a personal jet in a locker you can hop aboard and go WAY out of state !