@rhodion , assuming that the situation you are describing is as follows :
1. you and your spouse ( because "we" in your post ) were resident of CA till 06/30/2021 ( ? ) and then moved to WA on 07/01/2021.
2. You took steps to establish your residency in WA ( closer connection, home, banking, voter reg., driver's license, car reg etc. ).
3. You had a second home in WA ( from before ? ) which you now sold. The capital gain is substantial (?).
4. The question now is -- do you have to include this income in a part year resident CA return. Generally, absent any other facts and circumstances to the contrary ( to my assumptions above ) and that your purpose in establishing residency in WA was not solely to avoid paying taxes to CA, the capital gain is not CA sourced income and therefore not taxable by CA during the non-resident period.
Does that answer your question ?
Is there more I can do for you ?
