Your facts don't make sense, so hopefully after addressing @AmeliesUncle questions, things will be clearer.
But to add some commentary, the section 1250 gain is not additional gain. This is a portion of the gain that will be subject to a 25% tax rate (unrecaptured Section 1250 gain).
*A reminder that posts in a forum such as this do not constitute tax advice.
Also keep in mind the date of replies, as tax law changes.
