Here’s how using a Self-Directed IRA (SDIRA) to invest in real estate enhances these benefits, especially for those looking to diversify their retirement portfolio: Tax-Advantaged Growth: Real estate investments inside a self-directed account grow tax-deferred (traditional SDIRA) or tax-free (Roth SDIRA), meaning rental income, appreciation, and even gains from selling the property stay shielded from taxes until withdrawal—or forever in the case of a Roth!

(Anything that isn’t your primwry first is only tax free on a pro-rated basis.)I don’t know how you could swing it but…If they gifted you the kand they would avoid their capital gains tax.

This is most of the depreciation you are taking year one.You can calculate your depreciation recapture by taking the sale price of the asset and subtracting the adjusted cost basis.The adjusted cost basis is what you paid for the asset plus any improvements you made along the way minus the depreciation you took along the way.The profit above this original cost is taxed as a capital gain, but the part linked to depreciation is taxed at a maximum rate of 25% under the unrecaptured gains of section 1250.To recap the tax rates are:- Sec. 1250 real property: 25%- Sec. 1245 property and 15 year 1250 property: Ordinary Tax RatesThere are ways to minimize depreciation recapture especially if you know how to work smart with your CPA.1) Asset Valuation at Time of Sale - Sellers can minimize recapture by reallocating the price of the assets on sale.

This defers capital gains and depreciation recapture taxes on the sale of your fourplex.After converting it into your primary residence, you may qualify for the primary residence capital gains exclusion ($250K single/$500K married), but only for appreciation after the conversion; gains from the rental period remain taxable.

Selling at FMV avoids the gift tax but provides your child with a higher tax basis, reducing their future capital gains liability.A better strategy for selling below FMV is to sell the house at FMV on an installment note, then forgive interest and principal annually up to the gift tax exclusion amount.

However, the depreciation claimed while the property was a rental must be accounted for upon the future sale of the personal residence, which could increase your capital gains tax liability.The adjusted basis of the property (original cost minus depreciation) will be used to calculate gains or losses at the time of sale.

No capital gains! 

So there might not be enough gain to need a 1031 exchange.If there is enough gain to justify the 1031 exchange then simply treat your replacement property as you would any other investment like @Daniel Osman said. 

@Edgar Duarte Selling now under the primary residence exclusion avoids capital gains taxes, allowing you to reinvest the $500K equity in diversified assets like index funds or additional rental properties.

Is it better to sell, pay off mortgage and capital gains and take the cash to invest in another property or is it better to refi/ETO and take the cash to invest in another property?