Artificial intelligence (AI) has influenced the design field, offering solutions to urban renewal design problems. This study aims to develop a stylized generation technology for building facade decoration in historic districts using conditional generative adversarial networks (CGANs). The research focuses on Putian, a historic district in Fujian Province. It includes image data acquisition, processing, screening, model training, image generation, and style matching. Findings show CGAN technology effectively generates historical district decorative styles, providing overall or partial facade design schemes. The method adapts to historical district reconstruction, facade renovation, and renovation design, especially for districts with distinct styles. It aids in determining facade decoration styles for specific historical buildings. The method learns internal laws of complex district styles, generating new designs with clear style attributes. It enhances stylized control in historical heritage protection, improving design efficiency.