It is the procedure/requirements to attest a housing contract / rental agreement. As per the law it is required to register a contract with the municipality,even though we don't the same normally. The attested contract will be required only if any dispute arises between the landlord and tenant.

However MOI has insisted to have the rental agreement attested by the Municipality. The requirements are the same with them whether you use it for obtaining a new family residence permit or not.

If all the required documents in place, the process will be finished in less than an hour.(from my personal experience)