This study addresses the need for sustainable urban design, focusing on enhancing street-level interactions in line with the Sustainable Development Goals (SDG 11). The research specifically examines the evolving role of urban furniture and infrastructure in creating inclusive, resilient cities that respond to current challenges, such as climate adaptation and citizen accessibility. Using a qualitative mixed-methods approach, this study combines keyword analysis and semi-structured interviews with urban design experts, and comparative case studies in the Basque Country. Key themes emerged, including sustainable water management, Nature-based Solutions, technological integration, and pedestrian prioritization. These findings underscore a shift from static, object-oriented urban components to adaptable, modular designs that balance functionality with environmental and social sustainability. This study concludes with a checklist for urban furniture design, offering practical guidelines that will inform the next research phase: prototyping innovative urban furniture solutions to support more sustainable and inclusive city environments.