I gotta throw the BS flag on this one.
MNGRR is NOT moving anytime soon.
The "landlord" for the property occupied by the Museum is Phineas Sprague, the same guy that brought them there from EDAville.
You (or whoever told you,) may be confusing stories, as before the collection moved to Portland there were many rumors of "Ocean Spray" not wanting to renew the lease for EDAville. Exactly how true any of these particular rumors was at any one given time generaly depended upon who was asking who.
The only place MNGRR is moving now is "FORWARD!"
Cosmo
"It belongs in a MUSEUM!"
-Indiana Jones