Is discoloration on the exterior wall harmful?

Hello everyone,
we might want to buy a house and have a question about the discoloration on the house.
The discoloration appears on every floor along the intermediate ceilings around the house and on the roller shutter boxes. The floor slabs are made of concrete, and I suspect that the concrete stays particularly cold for a long time compared to the rest of the masonry and that condensation forms exactly at these spots, causing organic deposits to accumulate over the years. Or do you think it is something "bigger"?

The house was built in 1995 and has no additional external insulation. Additionally, the previous owners apparently rarely ventilated and heated irregularly.

Would appreciate your helpful opinions.

Best regards, Scharlie

Hi,

looks like at our new house. There, stress cracks were repaired and the dear painter used a wrong RAL white tone so that it looks like there is water damage, like with you.

What does the owner say? Basically, you are asking questions about a house built in 1995. It would be advisable to spend a few euros and go through the house with an expert.

Some were grateful after such an inspection

Thank you for your reply. However, I do not believe that this is a wrong shade from a painter, as I know from the sellers that nothing has ever been done to the facade. It is also contradicted by the fact that the roller shutter boxes are also affected. What may not be so clear in the photo is that it does not look like it was caused by human hands.

Are there any other theories?

The inspection with the expert will probably still take place if the house makes the shortlist.

The window lintels were probably cast together with the ceiling. Therefore, at least the same external appearance here.

I don't believe there are any window recesses there at all. That is probably the roller shutter box.