Subordination and Attornment Upon request of the Lessor, Lessee will subordinate its rights hereunder to the lien of any mortgage now or hereafter in force against the property or any portion thereof, and to all advances made or hereafter to be made upon the security thereof, and to any ground or underlying lease of the property provided, however, that in such case the holder of such mortgage, or the Lessor under such Lease shall agree that this Lease shall not be divested or in any way affected by foreclosure, or other default proceedings under said mortgage, obligation secured thereby, or Lease, so long as the Lessee shall not be in default under the terms of this Lease. Lessee agrees that this Lease shall remain in full force and effect notwithstanding any such default proceedings under said mortgage or obligation secured thereby. Lessee shall, in the event of the sale or assignment of Lessor's interest in the building of which the Premises form a part, or in the event of any proceedings brought for the foreclosure of, or in the event of exercise of the power of sale under any mortgage made by Lessor covering the Premises, attorn to the purchaser and recognize such purchaser as Lessor under this Lease.