Some $1.7 billion in collective sales have been transacted so far this year.
According to property consultant Credo Real Estate, the figure is almost the same as the collective sales transacted last year.
One of the latest transactions is a 40-unit walk-up apartment development on River Valley Road, which fetched $70.5 million.
Credo said successful deals over the past 18 months have been relatively small.
Mr Singh said: "The outlook for the collective sales market for the rest of 2011 is positive.
Source: Channel News Asia