A load storage system is provided for holding standardized containers including a first stocker for being positioned on a first story and a second stocker for being positioned on a second story. The first and second stockers each include at least one load support for supporting the standardized containers. A floor is positioned between the first and second stockers. The floor defines a portal between and directly connecting the first and second stockers. The portal is positioned in alignment with the load supports in the first and second stockers. A vertical transfer device is positioned in alignment with the load supports in the first and second stockers and is configured to move the standardized containers through the portal between the first and second stockers. A method of operating the load storage system is also provided.