In November 2017, GMF’s Urban and Regional Policy Program convened 150 of its transatlantic leaders for our annual BUILD conference, which took place in Detroit, MI. GMF partnered with AARP on a breakout session entitled, Multigenerational Cities: Aging as Innovation. This session brought together a cross sector group to discuss the importance of building multigenerational cities, and to share thoughts on the policies, plans, and practices that contribute to age-friendly cities. As a follow-up to BUILD, GMF and AARP decided to convene a small group of transatlantic experts from our networks where they explored a specific dimension of multi-generational housing in transatlantic cities: how can the existing housing stock in established communities be adapted with new housing models and technological innovations, as an important part of the solution to the affordable and accessible housing challenges faced in many cities. They discussed new housing models, such as shared housing and accessory dwelling units, which offer the opportunity to connect multiple generations, reduce isolation, and improve integration. While technological innovations from smart home devices to apps are enabling people to age in place and stay connected, there is a need for increased access for older generations to affordable and future proof technologies and a need for partnerships among community, small builders, and local government to provide inclusive housing options. While technology and new housing models are distinct, they are shaped by policy, planning, and regulation at the local level.