exhibit 10. 21 license agreement ( office space ) summary of terms contract no. doc646 airport 6n5 atlantic aviation metroport nyc, 499 east 34, h street, new york, ny 10016 operator macquarie aviation north america 2, inc. d / b / a / atlantic aviation metroport master lease agreement ( s ) concession agreement dated october 1, 2019 between the city of new york acting by and through the nyc department of small business services ( nycedc ) and macquarie aviation north america 2 inc. facility heliport located at 499 east 34th street ny, ny 10016 user name : blade urban air mobility, inc. contact : melissa tomkiel ( * * * @ * * * ) phone : # # # - # # # - # # # # email : * * * @ * * * description of space south terminal lounge and office space for helicopter passengers and staff to include storage. automobile or other vehicles are not permitted on the active ramp, parking for one vehicle included in facility parking lot on access road. purpose for use of space use for passenger lounge and reception for blade helicopter customers prior to flights. use of area to operate office staff and blade helicopter personnel during business hours of the heliport, 0800 am to 8 : 00pm monday through fridav. effective date december 1, 2019 initial term [ * * * ] with mutually agreeable option, not to be urueasonably withheld, of an additional [ * * * ] terms tbd user fees * space use fee ( monthly ) : year i [ * * * ] [ * * * ] [ * * * ] : tbd parking : included one space in access road lot janitorial : nia security : nia other : all maintenance related to tenninal electric, plumbing and construction is at the cost of the tenant blade inc. see attached terms * all fees and charges, including without limitation the space use fee is subject to an annual increase of a minimum of 10 % on each anniversary of the effective date. contract no. doc646 contract no. doc646 airport 6n5 atlantic aviation metroport nyc, 499 east 34, h street, new york, ny 10016 airport 6n5 atlantic aviation metroport nyc, 499 east 34, h street, new york, ny 10016 6n5 atlantic aviation metroport nyc, 499 east 34, h street, new york, ny 10016 operator