Who should pay structural engineer in this case?

[Tarik Hodzic]

Hello,

I am in the process of buying my first investment property, a triplex.  The triplex was a complete renovation by the seller.  After inspection, the inspector noted concerns about the foundation and the caving floors.  I asked the seller if they had the building inspected by an engineer and if not if they would pay for one to check out the foundation and floors.  They came back and said it has not been inspected and he wouldn't pay for one.  Should I just bite the bullet and pay for one?