YOu don't "update" anything. You have an outright purchase/acquisition to report. I assume you closed on the purchase in 2023?
You need to provide more details too, as I'm not clear why you would need to amend a prior year return because of a purchase/acquisition you made in 2023.
Also need details of how things were "before" the separation/divorce/buyout. Was only one unit rented out? If so, when was the property originally acquired or first placed into service? Maybe both units were rented out and you lived elsewhere? Maybe neither unit was a rental until some point during or after the separation/divorce?
Lots of variables here. So need details, mainly on the historic use of the property, along with how it was reported in the past.
What was the last tax year a joint return was filed, on which this property or any portion of it was reported on SCH E?
