This thesis examines how community archives in Southern California negotiate the built environment through practices of spatial care. Based on ethnographic fieldwork at the June L. Mazer Lesbian Archives, La Historia Society, and the Chinese Historical Society of Southern California, it explores how physical space becomes an active medium for sustaining community presence, relational belonging, and memory. Findings reveal that community archives reshape non-purpose-built environments through practices of anchoring, inviting, and transmitting. Anchoring roots archives materially and relationally within neighborhoods; inviting fosters emotional connection and participatory use of space; transmitting carries embodied memory and relational knowledge across time. This study argues that spatial care is fundamental to the endurance of community archives. In adapting inherited physical spaces to meet archival and community needs, community archivists challenge systems of exclusion and erasure, demonstrating how memory work is embedded not only in collections, but also in the built spaces that hold them.