@Jimandpatti , in short you will pay ordinary income tax on the recapture portion of the gain and capital gain tax on any residual gain.  Your basis for  gain computation  is the acquisition basis  plus cost of improvements over the years LESS accumulated depreciation.

You can use TurboTax 2020 to compute your  gain and taxes thereon -- save the  filed return under a different name  and then make the changes --- I am assuming here  that you have the desktop version and preferably Home and  Business

Does that answer your query or do you need more help ?

have been renting it since 2010. If we sell it do we have to pay capital gains

Yes, with the assumption that you were/are not military and moved out in 2009-10 because of official PCS orders requiring you to relocate.

would we use the beginning value of the property of when we started using it as an investment or the original value when we built it in 1987?

Your cost basis for the purpose of determining taxable gain on the sale is what you paid for the property originally, plus the cost of any property improvements, minus the total amount of depreciation taken on the property during the entire period of time you owned it.

If you report the sale in the SCH E section of the program, then the program will take care of depreciation recapture "for you", so that it's taxed correctly. Remember, recaptured depreciation is taxed at a maximum rate of 25%, even if your AGI increase resulting from the gain on the sale puts you into a higher tax bracket.