Depending on where in the country a storage facility is built, the buildings may have to be constructed out of different materials. Storage in California has to be aware of earthquakes. The Midwest is more concerned with tornadoes. And the Gulf Coast states are on the look out for tropical storms and hurricanes. This dictates whether the buildings are made out of aluminum, concrete, or even carbon polymers. Some companies even choose to place solar panels on the roofs of their storage buildings to offer a green solution to energy consumption concerns.