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Yes, you must report it as a business sale since it is not your primary residence and you have used it as a rental in the past.  This will take care of the gain appropriately on your tax return.

1. Wages & Income at the top
2. Scroll down to Other Business Situations
3. Select Sale of Business Property
4. Select Sales of business or rental property that you haven't already reported.
5. Answer 'Yes' to Do all of the following apply...?
6. Enter your sales information, do not make an entry for depreciation (no zeros)
   1.  Description of the Property (Second Home/Previous Rental Home)
   2. Sales Price/Sales Expenses 
   3. Date acquired and date sold
   4. Sales Price
   5. Cost
   6. Depreciation
7. @tax_user_sb