If memory serves, there's a pretty big flaw in the Singapore rental market. Obviously the population is relatively small as is but I believe that just under 90% of the population live in government subsidized / sponsored accommodation (they're the multi-coloured buildings you see everywhere). That leaves your rental base pretty thin. I would say there are areas of the city where there is strong rental demand, i.e. around Orchard Road but the prices are astronomical. Because it's a city state though, in the grand scheme of things, you would be unlikely to lose money.