Tricky Question: Lease Deed under TPA

Abdul Rehman leased his factory to X for 5 years, and X sub-leased it to Y for 3 years. Lease deed between Abdul Rehman and X mentioned that X can sub-lease the property but the sub-lessee would not be allowed to assign his rights. Y, however, assigned his rights to Z without getting prior permission from Abdul Rehman. The question is, whether Z is the lessee of Abdul Rehman or not? Assume that Z performed his duties and paid the rent promptly.

The correct approach is to remember that an assignment is different from sub-lease. An assignment is a transfer of the entire term, whereas sub-lease is a transfer of part of the term. In this case, Z got the assignment from Y, so Z is the lessee of Abdul Rehman.