BTO flats typically come with a 99-year lease, and once you fulfill the required Minimum Occupation Period (usually five years), you may sell them on the open market. Short-lease 2-room Flexi flats, however, run from 15 to 45 years. These must be returned to HDB if you no longer wish to stay in them or become ineligible. You can check the lease details in the official sales documents or directly with HDB to confirm if you have a 99-year BTO flat or a short-lease 2-room Flexi flat.
