Climb onto the single crate just to the left (when facing the door with the lion). From there, jump to grab the edge of the two stacked crates. Pull up.
Turn right, head toward the end of the container and take a running jump to grab the air conditioning unit mounted high on the wall. Pull up. Now turn right and take another running jump to the top of the brick wall where there's a small gap to the left of the walkway. To get onto the walkway, stand on the small mesh box to the left and jump over the railing.
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