房子地基沉降问题求助

我们最近想在山里买一个小度假屋.房子是建在一个比较陡的斜坡上面的.seller disclose这个房子有地基沉降的问题.卖主提出会在close escrow之前修好.卖主正在请人打5根钢柱还有注射一种polyurethane在房子的周围.总共大概花费1.5万.他们说保质15年.可是我们觉得这事情挺玄的.他们的检查报告里说的好像挺严重的.
我把他们的报告也贴在这里.希望各位有经验朋友给各意见.这房子我们能买吗?


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.