Good discussion.

I have a similar experience and intend to file the CA 540NR. My problem is that I owned the home for 35 years with massive appreciation in value (~$4.5m over the original purchase cost). The Sale price and CA withholding doc shows the correct sale price just under $5m. My records as to improvements and thus the cost basis are very weak, partially due to a divorce 10+ years back where my Ex cleared out with some files. I'm wondering about my audit exposure and have some information that indicates that the FTB is very aggressive. What am I in for??