Sandship Docks:

Costs double price to upgrade market to tiers All desert count as highest tier roads available Docks contains a district slot which can only hold a market district Making the district costs double the build cost to construct within the docks -The Lower tiers only count if you are the head of the market Gets stronger with more nations in the market 5 - Grants 1 Trade range per era and allows import and export to be used as each other. 10 - Lowers market purchase price by 15% for owner 15 - Nations that have Allied relations with the owner have a chance to extend invites to other nations 20 - Merchants make +$50, and +1 import & export slots. Upkeep 1d4+1 Mounts a session