After 99 years, the leasehold property typically reverts back to the freeholder, unless the lease is extended by the leaseholder. The ownership of the property, along with the land it is built on, returns to the freeholder once the lease expires. As a lease approaches its expiration, the property’s value may decrease, making it more challenging to sell or mortgage. It is advisable for leaseholders to consider extending their lease well before it reaches the 99-year mark to maintain the property’s value and their ownership rights.