Yes.
Many areas have had fluctuating fortunes. There are some areas in Victoria where the local Council, in an effort to maintain population, is offering free blocks of land to people prepared to build and live there.
Rexilla99, at the prices you are quoting these are fully developed blocks of land and obviously in an 'exclusive' area.
Be aware that 'specialist residential' is more fragile than bog standard residential. The bread and butter stuff moves slower through the cycle but maintains value as it has a larger market base than the exec stuff does.
Lenders look at market times as well as volume of sales and value of sales.
I you are asking 'should I hold off buying until market prices fall' you may be waiting a long time.
If you are asking 'as an investor, what are the chances that my purchase may fall in value (as well as rise in value)' the answer is that the value does not depend on you, the value depends on the overall economy and the overall market.
The domestic housing market is huge, demand is huge and supply is limited. If you are buying where other people are buying, and there is lots of building activity going on, that's quite different from buying in a place where nothing much is going on and there is no real reason for new people to want to come into the area.
At the end of the day, 'You pays your money and you takes your chance' - there are no guarantees and no limiters, either.
Good luck
Kristine