Final answer:
A termination clause in a percentage lease allows the landlord to regain the premises if the tenant does not meet a stated gross sales figure.
Step-by-step explanation:
A clause in a percentage lease whereby the landlord has a right to regain the premises if the tenant fails to achieve a stated gross would be known as a termination clause.
This type of clause allows the landlord to terminate the lease agreement under certain conditions, such as the tenant's failure to meet specific financial benchmarks. It serves as a form of protection for the landlord to ensure that the investment is yielding the anticipated financial return.