Intel #19) As soon as the mission starts, turn around to find Utopia's first intel on a reception desk.
Intel #20) After climbing out of the sewers, run through the streets and STAY ON THE LOWER LEVEL. Pass the first ramp on the left. Immediately before the second ramp on the left is a room with the second intel.
Intel #21) After grappling up three times to the first platform, look for the empty pool and the glass windows nearby concealing the third intel.