Your network hierarchy must contain at least one site with the country code defined, before you can add buildings and floors.
Use this task to add a new building to your network plan.
Alternately, use Google Maps search to automatically populate the address. If you manually adjust the marker on the map, the address updates automatically.
While sites do not require addresses, it is expected that buildings have addresses.

Note
While State is a required field for the US address format, the Province/State/Region field is optional for the international address format.