You could do what is called a section 1031 exchange to defer the gains but, you must hire a 1031 qualified intermediary... you would have to have it as rental for rental. So possibly convert primary to rental first. TT article:https://turbotax.intuit.com/tax-tips/investments-and-taxes/what-is-irs-form-8824-like-kind-exchange/...
IRS regs: https://www.law.cornell.edu/uscode/text/26/1031
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