Back in 1995, I was involved in a major restoration of a house that was on the national registry in Summit,NJ
The master bedroom which was rather large and directly above the dining room was totally out of level.
The correction was made by pouring ultra light concrete on the bedroom floor, on end was 4" higher than the other.
No structural reinforcement was need.
This was done by James Downs of the Downs Group
Go to Downs Group and take a look @ some of the projects he & I did
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