Adaptive reuse is reshaping the future workplace—turning underperforming office buildings into vibrant, mixed-use destinations that restore urban vitality. This article explores how placemaking strategies (street-level activation, permeability, greenery, and shared amenities) can transform existing structures into social infrastructure, with 20 Massachusetts Ave NW in Washington, D.C. as a case study. By designing within what already exists, cities and developers can create more engaging, sustainable, and community-centered workplaces.