Vacant office buildings in cities like Chicago and Washington, D.C., could be converted into affordable co-living units with private bedrooms and shared kitchens and bathrooms. This model suits older high-rises with challenging layouts, cutting development costs by up to 75% compared to new builds. Co-living offers affordable, amenity-rich housing for renters earning $20,000–$40,000 annually, addressing the shortage of small, centrally located homes.