The exchange value of your appartment will never be higher than it is now. If you want to change your apartment with someone else, please start the process now because it can take time.
In the application for change you have to have a considerable reason for the change (closer to work/school/family, bigger etc.).
The person you’re changing with has to be on the contract on the day that the assosiation buys the property (”tillträdesdagen”) if the new tenant wants to buy the apartment for the cheaper price, 70 % of the valuation.