sitting tenant 
noun British
A tenant already in occupation of premises, especially when there is a change of owner.The defendant, at the time of the transfer, was a sitting tenant of Poplar and it was intended that she would be treated no better and no worse than if she remained a tenant of Tower Hamlets....
- We are taking legal action to evict a sitting tenant.
- The company has bought the house, but failed to evict the sitting tenant.
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