So I can't see of the previous owner opted in/out for OCS?
I saved this text from another forum. Think this is what you asking about?
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These will be stated in the units list when the package is released.
e.g. #12-123 (FF)
FF – Flats with Floor Finishes These flats are provided with floor finishes in the living/dining rooms and bedrooms.
OK – "Open Kitchen" concept This flat has an "open kitchen" concept, in which there is no partition wall between the living/dining area and the kitchen.
OF – "Open Kitchen" concept with floor finishes This flat has an "open kitchen" concept, in which there is no partition wall between the living/dining area and the kitchen. The flat is also provided with floor finishes in the living/dining rooms and bedrooms.
If not stated, means
default
Flooring and wall tiles for kitchen and bathroom
Flooring for service yard and household shelter
All internal doors (rooms plus toilets plus household shelter)
All sanitary fittings in bathrooms (means HDB sink, tap, toilet bowl, shower head)
Reason being as they are SBF flats you don't have the option to opt in or out of anything therefore the default HDB flat will be as above. All these will also be included in the cost of the flat already.