After 100 years you (your grand children) will get a notice stating the lease is over. You would then have two options.The land development rights of the properties are given and sold to the developers for a lease period of 99 years. You need to register the lease within four months of signing the lease agreement. A 99-year lease is, under historic common law, the longest possible term of a lease of real property. When the development authority allots development rights of the land to the builder, it is usually for a lease of 99 years. The landowner allows the land for lease for 99 years which commences from the date the allotment was conducted. The development authority usually gives development rights of land to a builder for a 99-year lease. You flat will be leasehold only as you (or other flat owners) don't own the actual land. By default (unless otherwise mentioned) it is 99 years.