Rent space
Renting Storage Space is a rare mission that can be found in the Tavern's Side Room.

You are asked to provide storage space, for a price. You are not required to have enough warehouse capacity (just a trading office), though the profit will be smaller if you have to rent additional warehouses to store the goods.

Note that daily cost of renting additional warehouses is 1Gold per load (or 10Barrel), while own warehouses cost around 0,3Gold per day.