Capital gain investment property with mortgage?

I am selling my property for 1.5M and owe to the bank about 1,050,000 which is a mix of default and principal. About 300 of default. This is my investment property that I've owned since 2005. I am single. How much would my capital gains tax be? The loan will be paid off during escrow. I bought the property in 2005 for around 700k

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