Kastle Systems International LLC is in talks to go public through a special purpose acquisition company started by Simon Property Group Inc., according to a person with knowledge of the matter. Kastle, backed by veteran SPAC investor Mark Ein’s Venturehouse Group, is discussing a business combination with Simon Property Group Acquisition Holdings, Inc. (NYSE:SPGS), the person said, asking not to be identified discussing private information. A deal hasn’t been reached and the terms could change or talks could end without an agreement, the person said.