I am not sure what you are asking here but the federal long term capital gains was 20% plus another 3.8% investment surtax for capital gain income over $418,401 in 2017.
For California state income tax, I have been unable to find what the historical rates were in 2017 but I assume these were at 13.3%. So yes, you are taxed at 23.8% on your federal return and 13.3% on your California return.
According to this state of California publication, you will be taxed for the sale of your home in California because it is located in California. Residency has no relevance and there is no offset benefits.
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