Strange radial artifact

[Danielhruby]

Please note this image is only partially rendered here, but I can't seem to figure out why I am getting this strange radial Moire pattern on the wall by the window and on the mirror to right edge fo the image. I don't seem to hav the same problem when I render from the bathtub looking back away from the window. I recall having similar problems before when I had a light item coincident with light fixture geometry. But I check that and don't think that is the issue. Any ideas on what else I should check for? I have turned off all lights except the sun, I have turned off all geometry I can, except the building, I have tried mesh clean up and removing Vertex maps.

If I render with VRay RT, the problem goes away. But if I do a standard render, the problem rears its ugly head.

[Danielhruby]

Here is scene file:

[vladimir.nedev]

There is maybe overlapping polygons there. Check for that.

Greetings,
Vladimir Nedev