No, you cannot create a super-ordinate object with reference to a sub-ordinate object. What I would recommend is you download the the building information change the building validity date to the appropriate date, make appropriate changes to that downloaded info'n and upload it as BE in the system.
All these mass changes can be achieved using existing BAPI's..You can find the BAPIs in BAPI (Tcode) -> Real Estate Management -> Flexible Real Estate Management