Commercial loan contracts are generally in quadruplicate, one for individual customers, one for the handling bank, one for the real estate developer and one for the Housing Authority.

Customers need to use this as proof of house purchase and loan relationship with banks, real estate developers need to use this as proof of title certificate, banks need to use this as proof of loan relationship with customers, and housing mortgage registration of Housing Authority also needs to be filed (generally it can be obtained within 10 to 20 days after signing the contract).