When selling any property (whether real, personal, or intangible) the gain realized on the sale for federal and California income tax purposes is determined by subtracting the taxpayer's adjusted basis in the property from the net sales price (gross sales price less certain expenses of sale). In the case of purchased real estate the adjusted basis is generally the price the taxpayer paid for the property plus the costs any improvements made to the property and less any depreciation allowed or allowable.
However, the rules are different for property acquired either by gift or inheritance. In the case of a property interest that is inherited (which includes for this purpose property that passes by operation of law on the death of the owner, like property held as joint tenants with a right of survivorship) the person receiving that property gets a basis in the property equal to the fair market value (FMV) of that interest on the day the decedent died (or, in rare cases, the date six months after the date of death). Because that FMV is generally going to be higher than the decedent's adjusted basis in the property right before death the adjustment to basis that occurs when property is inherited/passed at death is generally known in the tax community as a "step up" in basis, i.e. the basis is stepped up from the previous adjusted basis to FMV.
Property held as community property has the unique potential to step up not just the basis of the decedent spouse's interest in the property, but also the surviving spouse's interest in the property. That is what the OP is seeking here.
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Yes, you are so correct. The difference between a 1/2 step-up where only the decedent is included and a full step-up where both of us are included is significant.