Brownstone renovation costs – why $100k per floor?

I have seen quotes on here several times that as a ballpark figure, you can budget for $100k per floor (not including kitchens and baths).

Can anyone break that down for me? I’m having trouble figuring out how it comes to $100k per floor MINUS the kitchens and baths.

Based on rough quotes I’ve been given from contractors, it seems that these are the main components:
-$15-20k electric + plumbing
-$15k new floors (if we go with pre-fab floors on a roughly 900sq ft place)
-$15-20k new interior walls and doors

Even being generous, that doesn’t come close to $100k. Where am I off in my estimates, or what else am I missing?

Thank you!

By U510545 |