You will need to figure the basis and the depreciation to accurately record the sale of this rental property.
Your prior tax returns tell the depreciation story. Go to the IRS, www.irs.gov, scroll down slightly to find the heading Tools and Applications, click the blue arrow to move through the list, on the box labeled your account click the link to go to your account, from there you'll be able to set up your taxpayer account. You will find your tax records in your account.
Other resources are the country website where the home is located. You will need to contact them directly for the sale records due to the age but if you make a request they should be able to get them to you. You will need what you paid for the property broken into the land portion and the improvement portion.
Other records you'll just have to do your best to find or piece together. If you absolutely can not find a record I would advise leaving that information out.
