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Memo to the Trudeau family: You’re smart to stay out of 24 Sussex Drive. Engineers say its walls might drop pieces of rock on those who live there.

Also, the walls have weakened enough to increase the chance of collapse in the event of an earthquake. Remember that day in 2010?

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Overall, the outer structure of grey limestone walls is in “poor to fair” condition. Some bits are “very poor.”

The venerable building with the killer view of the river is a victim to time, but also to the original choice of poor-quality limestone for its walls, mortar that varied in quality, and sub-par workmanship decades ago.

In some places, the mortar never made contact with the stones it was meant to hold in place. Some interior gaps never had mortar at all, while mortar in other spots has crumbled away.

And some of the limestone blocks are now “disaggregated,” or cracking apart under forces that include repeated freeze-thaw cycles, like a road with potholes.