Change the function of the lease and its consequences on the laid down law in Iran

According to the law of relations between the lessor and the lessee, the latter can not change the function of the lease arbitrarily. This function is defined by determining the kind and haracteristics of the usage which can be made of the lease. Now, if that kind or those characteristics change, the function of the lease will be changed. On the other hand, such changes have always no legal consequences, and there must be standards on the basis of which it can be recognized that which of them, if occurred, has any legal consequences. The change of function in various laws has different legal consequences some of which can be executed in any lease contracts while others can only be executed in some of them. The authors, in the present paper, try to present some standards for recognizing the change of function and that whether this change brings legal consequences or not. Finally, these consequences are dealt with.