The significant factors contribute to meeting the green requirements are the P5, P3 and penthouses roof space that is inaccessible to the residents. This means the change won't effectively reduce the current accessible space.
A good transition without traffic abruptness from the inside to the outside is essential to fuses the space utilization.
Greening inaccessible area also means better building insulation in addition to $ received from city?
Is this the canvass that missed being noticed?
An open space in contrast to over-cramped corridor!