Mutual enforceability clauses A mutual enforceability clause in a lease is a mechanism for a tenant to enforce covenants by other tenants in the same building. The clause may provide that a landlord will, if requested by a tenant, take action to enforce a breach of covenant committed by another tenant. See: Enforcement of covenants in flats: Halsbury's Laws of England [330]. For an example of a mutual enforceability clause, see Precedent: Lease of flat at clause 20.3: '20.3 Enforce obligations 20.3.1 The Landlord may and will, if so requested by the Tenant, enforce the obligations on the part of the tenant of every Other Flat 20.3.2 The Tenant will repay to the Landlord on demand the full amount of all costs and expenses of the Landlord of doing this 20.3.3 The Tenant must provide, before any step to enforce those obligations is taken, such security for the Landlord's costs and expenses as the