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It is my opinion that you do not have to pay the capital gains tax, provided the tax is below $250,000
You would only be able to avoid tax on your $250,000 not the marital $500,000 because your wife did not live there and it was not her personal residence
The homestead exemption only deals with your real estate property taxes
For federal tax purposes, a home is your primary residence if you live in it for 2 out of the last 5 years