your gain is sales price reduced by the cost and sales commission and increased by all the depreciation you've taken which is recaptured as section 1250 gain. from 2018 through 2021 you took 12969 thru 2020 +4221 for 2021 = 17190
218669+21331-186000-13000+17190=58190
you did nothing wrong. the gain is the 51k+
