A-1 Self Storage is one of the leading providers of self storage in California with 53 locations across California. A-1 is the Self Storage division of the Caster Group, a third generation family-owned company headquartered in Southern California since 1959. The Caster Group specializes in acquisitions, development, and management of A-1 Self Storage, and other commercial properties in California. Its real estate portfolio includes over 4.8 million square feet in real estate properties. It is one of California’s fastest growing companies.