Also, your question for a state that allows itemized deductions, but don't include state income taxes on its Sch A. If the 10k that are used on the federal are RE tax, then all 10k are allowed on the state.

If the 10k allowed on the federal are all state income tax, then NONE are allowed on the state.

Otherwise, in your situation, two-thirds on the federal are income taxes and one-third are RE tax.

Some states, like NY, have standard deductions so it doesn't matter.