Real estate question concerning a possible 1031 exchange.  We entered into an installment sale of a commercial property and have been paying the taxes on the money received.  The buyer wants to now payoff the property and we would like to reinvest it in another property without having to pay the taxes on the remainder ($500,000)  If we can't do the exchange, can we take back a Note with the property as security and just pay the taxes over time?