For you to have a reset, your husband must have owned the property solely and you inherited it. Otherwise, you owned a building that for your half was fully depreciated and only his half that you inherited had a stepped up basis. All of the prior depreciation should have been removed from the basis of the house when you entered it as a rental property.
The IRS requires you to deduct all allowable depreciation from the basis when you sell. If you have owned the property very long, the depreciation will wipe out the house and leave just the land. You may have passive losses that were disallowed over the years due to income that needs to be added back in. You need to go through all the years and see what basis was used when, depreciation taken, passive losses not allowed and determine what your real basis was in 2018 then move forward.
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