1031 Exchange is to exchange one income producing property for another. This is generally determined to be some type of real estate.
Further, if you are exchanging something worth $700,000 for something worth $250,000, that isn't going to help you. You would normally want to exchange for something of greater value.
If you're willing to take that much of a loss on your business, you don't need to do an exchange.
See a tax professional.
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