Timber Revitalization and Economic Enhancement (TREE) Act of 2007 - Amends the Internal Revenue Code to: (1) allow a tax deduction for 60% of qualified timber gains; (2) exempt deductible timber gains from the excise tax on the undistributed income of real estate investment trusts (REITs); (3) provide for the treatment of timber gains as qualifying REIT income and for mineral royalty income as qualifying income for timber REITs; and (4) provide special rules relating to income limitations and prohibited transactions for timber REITs.