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cantilever rigid diaphragm analysis

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In a concrete deck mezzanine (in a tilt-up building) w/ shearwall missing in 2 side along the perimeter ("1" and "2" in the drawing below), what are the localized check to be done in the rigid diaphragm in area "a", for seismic analysis?
 
Any other considerations besides the rigid diaphragm analysis?
 
Thanks in advance.
 
Luca Musacchio P.E.
 
sw indicates shearwall along the line
 
!                                             !
!                                             !
!                                             !
!____1___                               !
!             ! 2                             !
!       a    !__________________!
!                           sw              !
!                                             !
!              concrete                   !
! sw            deck               sw  !
!              mezzanine               !
!                                             !
!___________sw ____________!