Alkaff Oasis Sales Brochure: Site  Plan and Floor Plans bidadari-alkaff-oasis.pdf Under Period 8 Flying Star Feng Shui  (Year 2020) HDB Alkaff Oasis is considered a large neighbourhood as there are 1,594 units packed into this large plot of once "cemetry" land. Under Can or Cannot buy stage: for a start good to flag-out: 1. Precinct Pavilion(s) : especially lower units which has a birds eye view of the interior of the pavilion. 2. Hospitals (in this case Elder