This paper will articulate the conditions of thinking about the transition of Division II in Heidegger’s Being and Time in order to imagine the architecture of the missing Division III, which never appeared in the published Part I of Being and Time. The paper explores questions of temporality, historical temporality, and Heidegger’s confrontation with Hegel at the end of Being and Time while enlisting the resources of his very late lecture of 1962 – “On Time and Being” – to lay down the conditions of possibility to reconstruct the missing Division III. The paper argues that this feat has yet to be adequately accomplished given 90 years that have elapsed since the publication of Being and Time