Can someone tell me why they would withhold apartments from the...

Can someone tell me why they would withhold apartments from the market?

Surely it would have made sense to sell when built (and during boom time prices) and pay creditors such as waearth or return capital to shareholders?

http://www.realestate.com.au/property-apartment-wa-perth-123705238
29/101 Murray Street Perth WA 6000 3x2x2
This apartment is BRAND NEW and has never been lived in. It is being sold direct from the developer as it was withheld from the market during construction. As a result there is a high chance that a non-Australian resident will be approved by the Foreign Investment Review Board (FIRB) of Australia to purchase this apartment.