In reading the BCO, however, I think the local congregation does indeed have a strong argument: there are clauses that make the local congregation responsible for buying, insuring, paying for, and maintaining property. However, paragraph G-4.02 is written contrary to this and declares that no matter who holds the mortgage - even if it is a corporation acting in the name of the local church body - the PCUSA claims is as being held "in trust" for their purposes. Nice to be able to claim something that they have no financial interest in. I suspect that this is counter to the corporate laws of most states, so a lawyer will be required to fight this battle -- for sure the national general assembly will want to fight it.
Also, there is a clause that the local church must get written permission from a presbytery before buying property. If this was never done, then I would expect that the national org would have even less of a claim.
Anyway, here is the BCO, for what it's worth.
Virginia.