Выражение встречается в следующем контексте:
7.2.4 Tenancy Splits
The location of the two stairs in Towers 1 and 2 will allow individual floors to be split between tenants, with each tenant having access to both stairs through a common lobby or corridor.

The location of a central stair in Tower 3 will allow individual floors to be split between tenants, with each tenant having access to one stair in its own area and to the central stair via a common lobby or corridor.

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