In micro-renewal practices of historical districts

stark material contrasts at building interfaces often lead to a disconnection in the place's spirit. While existing research predominantly focuses on overall spatial configurations and functional integrations

systematic exploration of material transformation at these "minimum intervention units" remains lacking. Using Beijing's Lanman Hutong as a case study

this paper employs theories of place spirit and architectural semiotics to analyze the perceptual fracture between its original blue-brick facade and modern metallic materials alongside vibrant painted walls prior to renovation. It proposes a three-tier restoration strategy: "material minimally invasive suturing—vertical interface purification—cultural symbol re-emergence." The study reveals that interfaces serve not merely as visual facades but as silent carriers of place spirit. By reconstructing systematic material hierarchies and implementing layered perceptual restoration

this approach effectively restores historical districts' cultural fabric and community identity while preserving modern functionality

providing actionable pathways and evaluation benchmarks for revitalizing similar aging neighborhoods.