I have a client who had a fire in her investment building in June 2016. It has rental apartments and she runs her business from that location. She received a check for around 600,000. She owes about 100k on the building and had depreciated it. Rather than fix it she decided to sell. The sale did not go through in 2016 but she did receive the check. We are looking at some serious gain. Can the casualty loss and gain be postponed until the sale is complete in 2017?