You gain access to SoDoSoPa on Day 3 of the story. You can still return after completing the story. There is some money on the floor and other objects you can loot. Carefully look behind every tent and look for the money on the ground. It can be hard to see so walk very slowly and keep pressing X. You do not need to Fartkour up the tower to collect loot. You only need the loot on the ground level directly in the homeless camp.