Interpretation 1. The platform and terrace belong to a specific person and can be used alone. But you must abide by the law (for example, you cannot build it illegally or use it for rent, etc.).
Interpretation 2. From now on, since this part has become a private part of your home, the maintenance responsibility will also be borne by you independently. That is to say, the maintenance fund cannot be used for the maintenance cost of this part, and you pay the full amount.
You agree with both of the above points and have no objection.