This is the configuration of the apartments of The Factory, the Universal Apartment series reworked for conventional construction and new norms of social distance. The main innovation is a double-sided elevator directly accessing the apartments, obviating the need for the secondary staircase. 

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This elevator uses the designated floor reservation system of operation whereby persons are conveyed to their destination floors one trip at a time. The elevator is never shared with others except when accompanying them to their apartment. Such a system also works for unattended deliveries. 

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The desired for naturally-ventilated unenclosed spaces pushed this elevator to the outside where it accesses a private balcony from which the apartment is entered either via the kitchen or bathroom. 

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The slideshow shows the derivation, culminating in Version 4.2. There is a fundamental conflict between the elevator having both natural ventilation and privacy.