As cities continue to densify, natural surfaces are increasingly replaced by impervious materials, reducing rainwater infiltration and increasing pluvial flood risk. Ground-based Blue-Green Infrastructure (BGI), applied to open spaces and ground surfaces, offers a way to regulate rainwater while providing additional urban benefits. However, existing approaches primarily evaluate BGI through flood hazard reduction and provide limited support for linking urban-scale adaptation with building-scale resilience to identify where adaptations can deliver the greatest benefits. Drawing on the concept of Grounded Resilience, this research introduces a receptor-based approach that uses building flood resilience to ‘ground’ the spatial design of ground-based BGI adaptation. A Grasshopper-based workflow integrating rainwater simulation, BGI design evaluation, and building-level resilience assessment is developed and applied to the Lijnbaan area in Rotterdam. The results demonstrate how connecting urban runoff behaviour with building resilience supports targeted, early-stage decisions on where ground-based BGI adaptations can deliver the greatest local resilience improvements.