So we claimed it, you can build it.. But upgrading is an issue. There were two admin cities rank 15 at the start and their markets were pre-loaded with materials. We started a city East of the Southern starter town but are waiting on crops for cereals.. Somehow the West player city was upgraded to rank 1 near the start of the test.. We're assuming admin intervention or those admin city markets had the materials to make cereals and they just bought them all.