Exchanges where you have a total 180 day exchange period and 45 day ID period.
Close your Relinquished Property and all Replacement Properties on the same day.
Buy the Replacement Property before you sell your Relinquished Property.
New construction or improvements added to the Replacement Property.
A combined Reverse and Deferred Exchange. Sometimes with improvements.
Integrating an option to go past the 180 day safe harbor. Requires planning