Core contents of the rules: First, tripartite sharing model specification, clarifying that the total cost of elevator installation is shared by 40% government subsidy, 30% enterprise investment and 30% resident investment. The resident investment part is shared according to floor gradient, and residents on the 1st floor do not contribute; Second, government subsidy policy, government subsidy funds are composed of central financial subsidies for old community transformation and Xi'an municipal financial special subsidies, and the subsidy funds are directly allocated to enterprises; Third, enterprise investment requirements, enterprises participating in the model are responsible for the whole process of elevator construction, installation and 20-year maintenance, and the elevator property right is transferred to all owners of the community free of charge after 20 years; Fourth, resident rights protection, clarifying that residents have the right to use and own the elevator, and the elevator must be equipped with barrier-free facilities and emergency rescue systems; Fifth, enterprise access requirements, clarifying that enterprises participating in the model must have A-level qualifications for elevator production, installation and maintenance, with a registered capital of no less than 100 million yuan.