In order to optimize the allocation of urban functions, improve the efficiency of urban space resource utilization and comprehensive carrying capacity, develop and utilize urban underground space in a reasonable and orderly manner, and protect the legitimate rights and interests of urban underground space rights holders, Haining City, in accordance with relevant laws and regulations and the spirit of relevant documents and in light of the city's actual conditions, recently issued the Several Opinions on Strengthening the Management of Urban Underground Space Development and Utilization in Haining City, to promote the transformation of the economic development pattern and the sustainable development of the city.

It is understood that the urban underground space referred to in the Opinions means permanent buildings or specific spaces within the urban planning area of Haining City that are located underground or semi-underground, with a depth generally within 30 meters, a clear height greater than 2.2 meters (including 2.2 meters), clear boundaries, and that can be registered as basic units. The development and utilization of underground space includes combined underground space and standalone underground space. Combined underground space refers to underground space developed and constructed together with ground buildings by the same entity, while standalone underground space refers to underground space developed and constructed independently. The Opinions require that the management of underground space development and utilization should implement the principles of unified planning, rational development, public priority, and comprehensive utilization, and adhere to the combination of social benefits, economic benefits, environmental benefits, and national defense readiness benefits.

According to the needs of urban development, Haining City further strengthens the planning management of underground space development and utilization. The urban underground space development and utilization plan is a special plan of the urban master plan, compiled according to the development direction and strategic goals of the urban master plan, with a planning period consistent with the urban master plan and linked with land use planning and various urban special plans. Regulatory detailed plans for underground space are prepared for important urban areas, specifically stipulating the scale, functions, layout, transportation and public facility support, and passage connections with underground space in surrounding blocks for the development and utilization of underground space in important urban areas, and proposing various control indicators for the comprehensive development and utilization of underground space resources. At the same time, Haining City has established and improved the underground space ownership management system, starting from the acquisition of the right to use underground space construction land, the term of transfer of the right to use underground space construction land, and the registration and management of ownership of underground space construction projects.

The Opinions require strengthening safety supervision over the development and utilization of underground space and accelerating the construction of a public information management platform for underground space development and utilization. It is necessary to strengthen the management of construction projects for underground space development and utilization, strictly control the qualifications of underground engineering construction enterprises, and urge construction enterprises to strictly comply with safety construction specifications. It is necessary to strengthen the construction of a safety emergency system for the use of underground space, improve various emergency plans, enhance emergency response capabilities, establish and improve safety management rules and regulations and responsibility systems, and do a good job in the daily management, maintenance, and renewal of urban underground engineering facilities. At the same time, it is necessary to strengthen the collection and organization of data and information on underground space development and utilization, accelerate the establishment of an archive information platform for underground space development and utilization, and realize the integration and sharing of information resources.

In order to encourage land users to develop underground space and improve utilization efficiency, Haining City has further increased policy support for the development and utilization of underground space. For the right to use underground space construction land for commercial purposes obtained by bidding, auction, or listing, the starting price for the first underground floor shall be determined at 20% of the floor price of the corresponding use in the benchmark land price; the land transfer fee for the second underground floor shall be determined at half of the standard for the first underground floor; and the land transfer fee may be exempted for the third underground floor and below (including the third floor). The right to use underground space construction land for combined projects shall be transferred together with the ground land use right in one valuation. For the right to use underground space construction land obtained by agreement transfer, the transfer price for the first underground floor shall be determined at 20% of the floor price of the corresponding use in the benchmark land price; the land transfer fee for the second underground floor shall be determined at half of the standard for the first underground floor; and the land transfer fee may be exempted for the third underground floor and below (including the third floor). For the right to use underground space construction land obtained by administrative allocation, no separate allocation price shall be charged for combined underground space, and for standalone underground space, 20% of the allocation equity price for the same location and same use at the time of allocation shall be charged. At the same time, Haining City also encourages and guides social funds to participate in the development and construction of urban underground space. For social funds investing in the construction of air defense and disaster prevention sites and facilities, underground parking lots (garages), underground pedestrian passages, and other underground urban infrastructure and public service facilities, preferential treatment shall be given in relevant taxes and fees.