Inherited real property still in EIN grantor trust

Our father died 5 years ago. 

His home and assets remain in his  trust which was assigned an EIN after his death and 1041 is prepared each year. 

The home is intended for passive income but needed extensive repairs and has accumulated a huge carry forward loss.

As trustee and owners, but not the grantors, can we transfer another of our passive income properties into the trust to absorb the carry forward loss or would that constitute ownership change since the trust has an EIN?

We are both recorded with the county assessor's office as rightful owners.

As trustee I have authority to aquire assets for the trust. 

Thanks,