You probably do not have a reportable transaction, but you will want to have all the records in order to prove you do not owe tax. The number one thing you need is your basis.
Your basis would be the fair market value on the date of death (or alternative valuation date) so it would be the 2019 value, so you will want to find records. You may be able to find "comps" for neighboring properties sold near the date. I would recommend finding a qualified appraiser, the fees will be worth the tax savings.
If there is tax due, you may be able to get a credit for the taxes paid, but once again, this would be contingent on the amount of gain if any.
You are correct that you would not have to file the 3520.
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