The process of downgrading from a private condominium to an HDB flat in Singapore involves strict eligibility and financial considerations. For Singapore citizens, a key requirement is to dispose of their private property within six months of completing the purchase of a new HDB flat. Those looking to buy a new BTO flat must sell their private property and observe a 30-month waiting period before they can apply. The financial benefits of downgrading can be significant, as selling a private property often frees up a substantial amount of capital, which can be utilized for retirement or other investments. However, there are complex rules to navigate, especially regarding the use of CPF and housing loans. For private property owners who are 55 years old and above, more info there is no waiting period to purchase a smaller resale HDB flat, but those under 55 who sell their private property must observe a 15-month waiting period before they can buy a non-subsidised HDB resale flat. This waiting period is waived for those who sell their private property and buy a one- or two-room resale flat. The LTV (Loan-to-Value) limit and eligibility for housing grants are also subject to individual circumstances and HDB's regulations.