@Tim Kunz
Thanks! The house was built in 2001. So, its not that old. I noticed the crack about a year back (before the recent rain). And got the floor measured recently. Although there are no other signs like sticky doors, etc. My guess is that drought conditions for last 3-4 yrs have caused the soil to move and that's why the foundation seems to have moved. Its a 1592 sq ft two story home that makes me think that the 1.5 inch drop may be significant.
I agree with you that the price seems fair. After researching this topic a little bit more my main concern now is that underpinning with piers, etc may not necessarily fix the problem completely. I am now considering getting a soil evaluation done. So that I can try to fix the problem and then consider underpinning if the problem worsens. What do you think?
I called up a few geo-tech companies for soil evaluation but many of them don't do individual residential homes anymore. Do you know a few that do?