The height that containers can be stacked on sites in Long Beach outside of the Port of Long Beach are governed by the city's zoning regulations. Until today the limit was 2 containers, and all of the sites were occupied so there was literally no more capacity in the entire city to store empty containers.

Today the 2 container limit was temporarily suspended which essentially raises the limit to 6 containers - the max height at which most stackers operate. That's a 3x increase in empty container storage capacity which should give the system some wiggle room.