the look back period being five years, and as you say you have had the property for rent for all of those five years -- therefore it will be classed as income property --- no gains exclusion allowed. Where it gets troublesome when you convert a home ( main residence ) to income property, you need to keep track of both the original basis ( acquision cost plus cost of improvements during qualified use) and the FMV at the time of comnversion. Gain or loss is computed using both , further adjusted for allowable depreciation , improvements etc. But TurboTax will walk you through all of these issues. If you need more & specific help, please add your questions as comment
