The permitted use clause is one of the most consequential provisions in a commercial lease. Landlords want a narrow, specific use (e.g., "retail sale of women's apparel only") to preserve their right to consent to any business change. Tenants want a broad use clause (e.g., "retail and/or office use for any lawful purpose") to preserve operational flexibility. A use that falls outside the permitted use clause constitutes a default, even if the new use is otherwise legal. In lease abstracts, the permitted use must be captured verbatim - particularly in retail leases where it interacts with exclusive use clauses, co-tenancy rights, and percentage rent calculations.