If any of the Mortgaged Property shall be sold, transferred or otherwise disposed of by Mortgagor in a transaction permitted by the Purchase Agreement, such Mortgaged Property shall be automatically released from the Lien of this Mortgage without further action on the part of Mortgagor or the Mortgagee, and shall cease to constitute collateral hereunder, and then Mortgagee, at the request and sole expense of Mortgagor, shall execute and deliver to Mortgagor all releases or other documents reasonably necessary or desirable for the release of the Liens created hereby on such Mortgaged Property. Last Dollars Secured; Priority.