It depends on how many missiles that can reach Israel Iran has. If it's 3,000 missiles as it's estimated, I would say Iran can almost guarantee the destruction of 30 to 100 buildings anywhere in Israel, with lower probabilities of taking out more buildings.
Here you can see that the Iranian missile missed the Mossad HQ by like 300 meters, and probably 450 meters from the center of the building. If that's the CEP, you would need quite a few missiles for a high probability of hitting even a large building like the Mossad HQ. (Also imo hitting it would be purely symbolic)
Keep in mind this might be the effect of Israeli GPS jammers and not a rocket engineering problem.