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Looking for some general numbers ($/sf if possible) on doing a major renovation of a shell structure where the facade is to be saved, but everything inside is kaput.

This is a small 3-story semi-attached building that still has a nice limestone facade, but literally all the floors, joists, walls, everything inside has collapsed.

I’m trying to get a sense of rough numbers to basically build a new 3 story building behind the existing facade, and add a floor to the roof. I’m not even sure the back brick wall or party walls are structurally sound anymore.

Would love some input from anyone with this type of experience. I know it would be easier to knock it all down and start over, but I am very intent on saving the facade.