The Work From Home policy which had been implemented during the COVID-19 pandemic demands a more flexible way of working. In which one of the approaches, co-working spaces are considered as a solution to issues related to productivity, cost efficiency, and collaboration. Co-working spaces commonly use an open plan concept which had been known for its minimal physical boundaries. Yet in this pandemic situation, boundaries are needed to create physical distancing that we do to prevent the spread of the COVID-19 virus. Thus a question arises, how do we create a sense of boundaries while keeping minimal existence of physical boundaries in an open plan co-working space? I argue that the sense of boundaries can be applied with threshold theory as a strategy to emerge a sense of boundaries to keep physical distancing related to the COVID-19 protocol. Eventually, the existence of a threshold space will be able to facilitate co-working spaces to achieve the goals of productivity, cost efficiency, and collaboration. In addition to the threshold as the main design approach, six strategies are proposed as secondary design approaches: workspace decentralization as a system to track and monitor the spread of the virus, natural ventilation as a system to support air exchange, a particular facade pattern design as a regulator of the amount of outdoor air coming into the building, roof exhaust fan as a system to draw hot air to the outside of the building, modular platform system as building development consideration, and an escape chute as an adequate building evacuation system approach. Instead of relying on physical boundaries, the new public ground in a post-pandemic can take advantage of the sense of boundaries through the threshold space concept as a support to the COVID-19 health protocol.