The advantage for the owner is that he or she gets an immediate return on the investment they made building or purchasing the unit or land. For tenants, the pae jia makes seng less affordable than shortterm lease contracts, but it offers the advantage of long-term tenancy rights and freedom to build their own structure or to adapt the existing unit to suit their needs. When the lease period expires, tenants are often allowed to renew the contract. And some seng agreements come with an option to purchase the land or structure at the end of the lease period