Abstract: A shelving system having one or more shelving units is disclosed. In some embodiments, the shelving units include one or more corner shelving units and/or one or more rectangular shelving units, each of which has one or more shelves connected to and supported by uprights. Shelving units can be connected together by telescoping or non-telescoping rods. The rods can be connected to the shelving units by brackets connected to hanger rails on the uprights of the shelving units. In some embodiments, the components of different shelving units are the same, and can be interchanged, thereby reducing the number of different parts needed for construction of different shelving systems. Also, the free-standing nature of the shelving units (and resulting shelving system) can simplify installation and can enable shelving systems to be installed in otherwise unavailable locations.