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FOURTH AMENDMENT TO FIXED BASE OPERATION LEASE - AMEND LEASE BY ADDING AN ADDITIONAL AREA, KNOWN AS PARCEL B-16, AMEND LEASED PREMISES BY CHANGING "12.656 ACRES" TO READ "13.576 ACRES", BASED RENT FOR ADDITIONAL LEASED PREMISES TO BE $2,579.92 PER MONTH & AMEND OTHER CERTAIN SECTIONS OF THE AMENDMENT, EFFECTIVE 12/11/2006