LUCY is a decentralized rental community which is based on blockchain. In a decentralized blockchain network, globally idle apartments and consumers are linked in a shared way. Relying on the market needs of long-term and short-term rents in the global rental field, it needs to increase the utilization rate of idle residential resources. LUCY aims to provide authentic, transparent, and verifiable multi-party cooperation solutions and realizes high-yield, high-efficiency and high-quality win-win goals for apartment owners, apartment operators, and apartment consumers. LUCY offers a kind of free SaaS management system of apartment management for apartment owners and apartment operators to streamline offline listings and room status. It supplies the complete loT products, including intelligent door lock, intelligent electronic saving, intelligent furniture and intelligent fire protection, to standardize online information. Providing IoT devices to collect trusted data on the blockchain, which is collected from the rental behavior, creates distributed operating books in the global rental sector. The services of crowdfunding, supply chain finance, and upstream and downstream collaboration are offered for operators. Lucia also provides consumers some high quality, cost-effective, safer and more reliable rental products.