Districts 4 and 5 have shown healthy capital appreciation due to unique attributes and future development potential. D4 (Harbourfront, Sentosa, Telok Blangah) offers luxury waterfront condos with price stability and selective appreciation. D5 (Buona Vista, Pasir Panjang, West Coast, Clementi) benefits from spillover demand, strong rental demand, and varied price points. Both districts are well positioned for further capital gains, especially with the Greater Southern Waterfront development.