The configuration of office environments is related to worker satisfaction and can improve work efficiency. Although open offices promote communication among co-workers, privacy issues surface as well as increased risks from such health concerns as viral infections and pandemics. On the other hand, territorial offices protect worker privacy and reduce infection risks. Unfortunately, such arrangements often hinder communication among co-workers. Although a physical office must satisfy different needs under various scenarios with limited space, the lack of flexibility in furniture designs prevents dynamic space management. In this paper, we propose a self-actuated stretchable partition whose physical height, width, and position can dynamically change to create secure workplaces (e.g., against privacy and infectious risks) without inhibiting group collaboration. To support secure workplace layouts and space reconfigurations, the partitions' height, length, and position are adapted automatically and dynamically. First, we consider the design space of a self-actuated stretchable partition and implement a proof-of concept prototype with a height-adjustable stand, a roll-up screen, and a mobile robot. We then show some example application scenarios to discuss potential future actuated-territorial offices.