If I already have a top-renovated kitchen and bathroom, does this still need to be replaced?
Yes, since the sewers, pressurized water pipes and plumbing have not been replaced, all apartments must be renovated. The impact on the kitchen will be small as you will only pull out new drains and pressurized pipes, which can be done without major demolition.
It is not possible to save a newly renovated bathroom because the pipes will be laid via new locations.