Zone 4 (Winterberry) - Construction Progress - September 18, 2011 (View Gallery) D+25 Concreting of Basement 1 slab, 100% completed. D+25, D+26, D+27 Concreting of Raft slab at Basement 2 completed. Concreting of columns & corewalls from Basement 2 to Basement 1, 100% completed. Concreting of retaining walls at Basement 2, 100% completed. E24 Concreting of slab at Basement 1 completed. Concreting of columns from Basement 1 to Ground Floor, 50% completed. Concreting of retaining wall at Basement 1,  20% completed. E27 Basement 1 Post Tension slab casted.