If you have gain, then it is likely unrecaptured 1250 and should show on page two of your Sch D. If you're using Land as your main disposition asset, that could be the problem. Use Building as the asset and then link land and leaseholds back to it. I usually abandon any fixtures with depreciation codes 57 and 53 that usually fully depreciated anyway. All the informational diagnostics regarding the  1031 election can be ignored. You only need to make the election on one asset.