Hello @Vince Light
I understand that you want to retain some proceeds and expect to pay taxes on it. To help explain things, though, let me start with how to have full tax deferral and work my way to that.
When doing an exchange, for tax deferral there are three numbers to keep in mind. You also what to think 'exchange up'.
1- Buy replacement property that is equal or greater in value (less allowable closing costs) than what you sold. This can be done by buying more than one property, if needed.
2- Acquire debt on the replacement property(ies) in an amount that is equal or greater than what will be paid off of the relinquished property. This can be accomplished with a loan and/or bringing cash to the table.
3- Put all of the proceeds from the sale of the relinquished property into the exchange account and then use it towards the purchase of the replacement property(ies).
Any difference to any of these numbers is taxable boot.
So, if you sell for $750k and your closing costs are an estimated $50k, then you need to buy something worth $700k or more (again this can be across more than one property.) If your debt pay off is $315k, then you need to get a loan or bring cash to the table that is $315k or more. And, if after the debt and closing costs are paid you have $385k in proceeds, then you would need to use all of them towards the replacement property(ies) purchase. Again, any difference in any of those numbers is taxable, so you'll want to make sure that doing an exchange makes sense. If you're only reinvesting $70k and buying one $350k property, then it doesn't. If you're going to buy more properties and put more of the proceeds down, then it might. If you reach the purchase and debt numbers but only want to reinvest say $300k of your proceeds and retain $85k for a personal cushion, then I think it makes sense.