This is more of a housekeeping matter than anything. It indicates the government's intention that this monument, after the funds have been raised and after it has been installed and built and properly located according to the terms of the act, will then become the property of the National Capital Commission, which obviously means the National Capital Commission at that stage will be dealing with most of the requirements of the monument itself.
The second part of that deals with the fact that once it becomes the property of the National Capital Commission, any additional funds that would be raised would become the property of the National Capital Commission at that time.