The Landlord's right to forfeit this Lease is not affected by any acceptance of or demand for rent or any action which would affirm this Lease by the Landlord with knowledge of a breach of any of the Tenant's covenants contained in this Lease and the Tenant is not in any proceedings for forfeiture or otherwise entitled to rely upon any such acceptance demand or affirmation as aforesaid as a defence provided that this provision only applies to any acceptance of or demand for rent or affirmation of this Lease made during such period as may in all the circumstances be reasonable for enabling the Landlord to conduct negotiations with the Tenant for remedying the breach.