I cannot answer the CA questions.
If the land tax is a property tax (unrelated to the sale) you cannot deduct it all all for a federal return. It might be different if you had rental income. See https://www.journalofaccountancy.com/issues/2018/dec/foreign-real-property-taxes/
For federal, you cannot remove the $200k foreign capital gain tax from the proceeds. Think of it as you got the $200k and then had to pay it. The net proceeds of the sale are $1M - $10k (only if related to the sale like a US stamp tax, foreign tax not based on income) - $90k broker fee = $900k.
Your income is $900k - your basis. That is a capital gain. Call that $G.
You will not get back the $200k in foreign tax. What you will get back is the US tax on the $G capital gain, sort of. The US tax may be much less than $200k because US capital gains rates are so low. Sometimes, they are zero. So you won't pay twice. You will pay once (usually), but you will pay the higher of the US or foreign income tax.
1. if you itemize you can claim an itemized deduction for income taxes paid. I am not sure if the $10k SALT limit applies. But it's only a deduction.
2. The foreign-tax credit FTC will give you a credit for approx
the US capital gain tax on the property * [the foreign gain / your worldwide income)
That might be $200k. It might be less.
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