Clementi Crest HDB is really expensive. A 5 room flat (113sqm) is costing about $576K (2nd storey) to $725K (40th storey). Despite only 156 units of 5 room flat available, it was 10 times oversubscribed. My husband and I managed to get a queue number 198 but I doubt we are going to get a high floor unit which we always wanted.