Thinalbert,
Yes you've missed quite a lot.
1. Premises is responsible for all RBA buildings not just housing.
2. Buying is not an option for a Green IC holder.
3. Who would want to own a house in Brunei anyway? Not exactly an investment is it?
4. I could be wrong on this one and stand to be corrected but it may not be possible for an individual Green IC holder to rent a property with out the backing of a Bruneian sponsor (eg RBA).