房子地基沉降問題求助

我們最近想在山裏買一個小度假屋.房子是建在一個比較陡的斜坡上麵的.seller disclose這個房子有地基沉降的問題.賣主提出會在close escrow之前修好.賣主正在請人打5根鋼柱還有注射一種polyurethane在房子的周圍.總共大概花費1.5萬.他們說保質15年.可是我們覺得這事情挺玄的.他們的檢查報告裏說的好像挺嚴重的.
我把他們的報告也貼在這裏.希望各位有經驗朋友給各意見.這房子我們能買嗎?


Findings
Engineering standard for an out-of-level home is 0.5” of settlement within 10’, and is
where cracking and/or damage to stucco, drywall and concrete will begin. The interior
elevations show a maximum variance of 4.7 inches across the area measured with over
2.5” within 10’. The variance suggests that there is general foundation distress and that
the present foundation and soil conditions have experienced settlement and is likely to
continue without additional support that can be obtained by underpinning the
foundation.