@Elias Dagher We do not have an exact number or an estimate for the 3rd story, because we own the construction company that does the work. 

hahI read this article today (January home sales give rise to correction concerns) discussing market correction in the near future for Toronto and Vancouver, given that now even the condo market is seeing double digit growth month after month, without a shortage of supply unlike in home prices.My question is: Is there a way to estimate or calculate the ripple effect of that correction to the surrounding markets?

Why not just adjust your purchase price downward to reflect the inspector's estimated cost of the repairs in the inspection report?  

Scott The Book on Flipping Houses, The Book on Estimating ReHab Costs http://www.biggerpockets.com/flippingbookConsider checking out HUD homes for small multi's owner occupied gets first crack.

Scott The Book on Flipping Houses, The Book on Estimating ReHab Costs http://www.biggerpockets.com/flippingbookPaul

Scott The Book on Flipping Houses, The Book on Estimating ReHab Costs http://www.biggerpockets.com/flippingbookConsider checking out HUD homes for small multi's owner occupied gets first crack.

The Book On Flipping Houses & The Book on Estimating Rehab Costs by J.

Scott The Book on Flipping Houses, The Book on Estimating ReHab Costs http://www.biggerpockets.com/flippingbookConsider checking out HUD homes for small multi's owner occupied gets first crack.

Scott The Book on Flipping Houses, The Book on Estimating ReHab Costs http://www.biggerpockets.com/flippingbookConsider checking out HUD homes for small multi's owner occupied gets first crack.

I can tell you that your repair estimate is way way low.