This building is a research facility by the National Parks Board (NParks). This is used to test the growing conditions of plants from various parts of the world. This research will produce data for 2 cooled conservatories that will be built on the Marina Bay

There were many pretty plants in the glasshouse :)
More information can be found here:
http://www.greenmark.sg/public/greenmark/en/features/prototype_glasshouse.html