I don't have a simple answer for you. I think you'll have to report the sale...you should have received a F1099 for the sale. You state you sold the lot in 2018...did you report it on your 2018 return? If not, you many have to amend your 2018 return. Since the sale occurred in 2018, that is the year of reporting.
I'll provide you with links to two IRS publications. The first is selling your home. I don't think this qualifies as no home was built and you didn't reside on the property.
This is a link to Publication 544, Sales and Other Dispositions of Assets. Note that this pub and the prior pub are shown as 2018. As of the the time of this posting, no new pub for 2019 was available on the IRS site.
... View more