What is the difference between Jian 'an cost and unit area cost?

Jian 'an cost is the cost of building installation. Generally speaking, the cost per unit area also includes other expenses, including supervision fees, construction unit management fees, land fees, design fees, cost consulting fees, civil air defense relocation fees and so on. If the design has decoration, then both include decoration. Total cost = construction and installation expenses+equipment purchase and installation expenses+other expenses+reserve expenses.