The bidders include mega developers, i.e. Fraser Centrepoint, City Developments, GuocoLand, UOL and Hoi Hup. The highest bid came from a joint-consortium which comprises of Fraser Centrepoint, Sekisui House (who are also the developers for two other very popular projects - North Park Residences and Rivertree Residences) and Keong Hong Holdings, at S$624.18m or S$858 psf ppr.
The price of S$858 psf ppr for this Siglap Road GLS site rivals that of the GLS site next to Redhill MRT Station at S$851 psf ppr won by Tang Skyline Pte Ltd in November 2015.
http://www.latestprojectlaunch.com/siglap-road-gls-land-parcel.html