Against the backdrop of the deepening urbanization drive in China, the continuous expansion of urban community scales, and the increasingly diversified living service demands of residents, China’s property service industry is undergoing a profound transformation—shifting from the traditional basic service model of the “Four Guarantees and One Service” (security, cleaning, maintenance, greening, and customer service) to the expansion of diversified services including community elderly care, child care, and housekeeping. This transformation has forged a new development paradigm of consolidating the foundation with basic services and strengthening the industry with value-added services. At present, the property service industry presents a distinct hierarchical pattern in social responsibility fulfillment: leading property service enterprises have deeply integrated social responsibility into their strategic systems and achieved initial synergy between social responsibility and business development; in contrast, small, medium and micro enterprises (SMMEs), which constitute the majority of the industry, generally regard social responsibility as a passive compliance cost or an additional burden, falling into a dual lag in both cognitive and practical dimensions. This structural differentiation has made the synergy between corporate social responsibility (CSR) and commercial value a key bottleneck hindering the sustainable upgrading of the entire industry. Based on the realistic context of the diversified transformation of China’s property service industry, this paper systematically analyzes the differentiated predicaments faced by property service enterprises of different scales at the cognitive, governance and institutional levels, and further proposes a construction path for a hierarchical synergistic development mechanism featuring in-depth leadership by leading enterprises, precise empowerment of SMMEs, and joint construction of the industry ecosystem. It aims to provide an insightful and operable analytical framework and practical guidance for the property service industry.