The study examined spatial bridging ties that develop between members of a subdivision, and the relationship of such ties to different aspects of the built environment. We suggest that spatial bridging ties are important to the development of social capital within a community, as they help to overcome a tendency for ties to be spatially proximate (the propinquity effect). Using ego-based network data, we examined the formation of spatial bridging ties within a new urbanist subdivision (NUS) and also identified specific design features of the NUS that were associated with such ties. We found an association between spatial bridging ties and the use of mixed-use amenities, suggesting that mixed-use amenities (e.g., local shops and restaurants) may be facilitating spatial bridging ties between residents in NUS communities. The results also provide some evidence of a positive relationship between spatial bridging ties and social capital.