1st BRRRR/the floors aren't level and need structural resupport.

We are looking to do our first BRRRR. My local market has gone up considerably in the past 3-5 years. Back then you could get a livable, rent-ready 3/2 home for around 100k... today, the gnarly ones are around 120k. We just got an accepted offer for 85k on a house where the floors are uneven, and in need of some structural resupporting. I had a contractor come out who said he could properly resupport the floors, but trying to make floors level again would likely open up a lot of other problems... anyone have an experience or advice? We don't want our first BRRRR to be our last.