Ultimately, I doubt we'll ever know since I doubt Disney will ever release any agreement. Doing a little bit more research, I think my opinion is now "I don't know."
My understanding of architectural copyright law, which, while I'm a lawyer, iI'm not an intellectual property lawyer, is limited to
what I found on NOLO. From that, it appears the chinese theater's design cannot be copyrighted because it was built before 1990. However, it may be trademarked. From the linked article:
Building owners have claimed building appearances as a trademark when used in connection with the sale of goods and services -- think White Castle and the Sears Tower. But in order for a trademark owner to stop you, the following would have to be true: (1) the building would have to have an identifiable, distinctive appearance; (2) the building would have to be publicly associated with certain goods or services; (3) your use would have to be commercial (not editorial); and (4) your use would have to be linked to an offer or endorsement of similar goods or services.
So, examining these elements:
(1) Does the original Chinese theater have an identifiable, distinctive appearance? YES.
(2) Is it publicly associated with certain goods or services? YES (more about this in a moment).
(3) Would Disney's use be commercial? YES
(4) Would Disney's use be linked to an offer or endorsement of similar goods or services?
That fourth element is probably what we lawyers would fight over. I would argue that no, it would not be an endorsement of similar goods or services. After all, in the studios, it houses a rideThe Great Movie Ridebut a ride, nonetheless. The original theater is just that, a theater.
But a good lawyer for the other side would argue that the original theater is more than just a theater, it is a tourist attraction unto itself. It is well known for the handprints and footprints in front of it. And, in the early days of the studios, events were held where celebrities did this, just as at the real Chinese theater.
I think the ultimate question would come down to something I don't know about the real Chinese theater. If it obtains any income from tourists coming to see its exterior or the handprints/footprints, then it can be said that it is associated with those goods and services, which Disney was attempting to recreate. Then, we have a case of trademark infringement.