H.6. 20-1282 APPROVAL OF THE SIXTH AMENDMENT TO THE LICENSE AGREEMENT WITH NORTHROP GRUMMAN SYSTEMS CORPORATION FOR USE OF THE AVIATION PARK GYMNASIUM AND A RENTAL FEE PAID TO THE CITY IN THE AMOUNT OF $9,404 PER MONTH FOR THE TERM APRIL 1, 2021 THROUGH MARCH 31, 2024 AND A TOTAL VALUE OF $338,544, WITH OPTIONS TO EXTEND THROUGH MARCH 31, 2030.