Slab leak  -  Level 5 to Level 3

The above water on level 5 may have been from someone washing their vehicle

Below are pics of the ceiling in level 3 (immediately below the above water on level 5) which evidence water dripping from level 5 above

The below pic is the ceiling of level 3 that was taken a few hours later still evidencing the remnants of the water from level 5

The below pic is the floor in level 5 that was taken a few hours later still evidencing the remnants of the water from level 3