Agree with Master of Propertism that we should not be downplaying districts. There is no doubt D9 will always have a premium over D15 because of its prime location. But tat does not mean it's the most popular because of this premium price it charges. Nobody dreams to stay in a mickey mouse unit in Orchard Road. All we know that affordability comes into play.
To live in a mickey house hole with no place to store goods, so what if you stay in or behind Orchard Rd? Build storage in the ceiling?
Everyday can only do window shopping? Don't you feel very awkward to host parties because more than 3 persons in the hole is already super cramped? Sorry, I don't think many will envy such "upclass" living...
Then again, to each its own. Singapore is too small to talk about segregating what's prime and what's not prime, what's swatch and what's omega. Because the amount one pays for an omega, another can buy 10 x swatch watches. D9 prices is probably only twice of D15. It's more like a Rolex compared to Omega.
Please go and buy all D9 properties since it is super popular because it will eventually lead D15 prices to go higher.