Sub-sale properties are purchased in the open market, from the previous owner, most probably an individual.
When purchasing a sub-sale property, it is important to ensure that the owner is the legal owner of the property. You can obtain all relevant information on the property by conducting a search on the property at the relevant land office and get confirmation of the registered owner and as to whether the said property has any encumbrances. By investing in a sub-sale property, investors know what they are actually getting for the money they paid.
Buying a property from open market, you can see the unit, the view, the finishing and also your neighbours. On top of that, the real figures such as rental and transaction price will be available.