United do own large parcels of land around OT. They have bought the land up over the years. Apart from an annual income the land generates, it also stops property developers building buildings close to OT. If you remember, United put an objection in against Neville and Hotel football.
I don't know if United own the railway freight terminal land? But I do remember something about them having to share a stadium for a few years if they built a new stadium on the current OT site.
View attachment 94623