What is the civil construction cost of a 2000 square meter civil air defense basement?

It should be more than 1000 yuan, but to be honest, the design of civil air defense basements varies from place to place. Some local design institutes calculate very carefully, so they save money. Some small design institutes are particularly conservative, so their prices are high. Why do you say that? There are three kinds of basements, artificial, steel and concrete, because the steel content designed by conservative design institutes is particularly high, and the design of good design institutes is just favorable.