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Rombout
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When the sun is away you need to check all glass and reflective items i believe.
Benjamin76
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With the number of lights in the scene and lots of translucent materials in use (division panels, table lamp shrouds, etc.), I won't be surprised to see noise hard to clean up.

The Rhino Sun is another major contributor of fireflies.
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Bogdan
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Another example. This time on a very simple model. I tested with the glass object as polysurface and single surface. I assigned a thea material instead of rhino default material and I also changed HDRI maps. It is strange how the noise and fireflies are showing up on the curtain wall but not on the glass rail.
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Rombout
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What color is the interior? Did you also check physical sky, perhaps the other IBL also has hotspots?
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I notice problems when the light from the sun hits materials which are slightly glossy (like the concrete I used) and when those materials with their shiny areas are reflected in the glass. While in some materials this noise is not that visible, on the glass it becomes disturbing.
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fireflies in reflection.jpg
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