[shaftway]

Not OP, but it's probably about inheritance rules. If you inherit a property then you inherit its tax basis. In fact, if I remember correctly, you inherit the tax basis, but the capital gains basis resets. You effectively inherit a property that has a low property tax, but face zero capital gains if you turn around and sell it.

All of this is subject to limits and rules and stuff. I think prop 19 made it so that you have to use it for your primary residence for the first year. And I think there's a cap on the difference between property value and tax basis of ~$1m.

[dragonwriter]

That's a soft cap, you get the full benefit if the value difference is up to $1m (in 2021, adjusted biennally for inflation since) or less, and if its greater you get the amount of value increase beyond the limit is added at full value (but the amount below the limit is still waived) in setting the tax basis value at transfer.