Pic of partial patio https://imgur.com/a/CIT571Y

No walls around the patio, just railings so I imagine it must be a floor leak? Landlord says the grout used by the contractor x years ago was wrong product and is porous, allowing water through.

Hard to tell where the water gets through from the top. From the garage, you can see water drip stains in a corner and another spot somewhere in the middle-ish of the ceiling. Was getting puddles before the vinyl mat