I completed a reverse 1031 exchange last year, with a bridge loan to buy replacement properties first. Does the loan interest go to cost basis, or as rental expense?

Because it was a reverse 1031, the EAT needed fund to buy the replacement property first. Thus I got a personal loan. Then after the exchange closed, I paid off the loan, then rented out the replacement properties. I know normal mortgage interests would be rental expenses, but this bridge loan was only for the exchange process, not secured by the properties. So intuitively I would think it should be closing cost and add to the new cost basis?

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