Render, podium

Someone help me!! Im test rendering and i noticed that the bottom of the walls look terrible.

That problem looks familiar, but I don’t recall the solution. If no one who can recall replies here, I’m sure someone will on their own bulletin board:

I don’t know especially about Podium, but I have seen these radiosity artifacts in other renderers. They used to happen when using either materials with no attached texture or then a very small texture.

In the real world this happens when the architect has decided to join the floor and wall with no trim and the cleaner uses damp instruments…

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Bleeding also happens when geometry does not close, whee a light is encapsuled by geometry etc.
Best if you upload the .skp file for inspection