Our home is a self-purchased building, and the developer detained my house number application procedure and asked me to pay the property management fee before returning it to me. Is it reasonable?

Property management fees should be collected by property companies, and developers have no right to collect them.

Buying land and building houses has nothing to do with developers, so the relevant procedures for detaining you are unfounded.

How did your application get to the developer?

Judging from your introduction above, the management fee should be paid in time, but there seems to be no basis for the property to deduct the passbook, as long as it is paid on time.