The Airport Changed Everything. The Motorway Did Not.

In Goldmate Property Luddenham No 1 Pty Ltd v Transport for NSW [2026] NSWLEC 22, the NSW Land and Environment Court awarded more than $38 million in compensation for land compulsorily acquired for the M12 Motorway. The decision is significant not only because of the amount of compensation, but because it confirms two important limits on the disregard provisions in the Land Acquisition (Just Terms Compensation) Act 1991 (NSW) (Act):

1. An acquiring authority cannot define the "public purpose" of an acquisition too broadly.

2. Causation must be assessed with close attention to the facts, not by mechanical application of a "but for" test.

The journey to that outcome began, improbably, with a nil determination.

The Background

Goldmate owned land at Luddenham, in Sydney's outer west. In June 2021, Transport for NSW acquired part of that land for construction, operation and maintenance of the toll-free M12 Motorway – the new link to Western Sydney International (Nancy-Bird Walton) Airport.

The Valuer-General, accepting arguments advanced by Transport for NSW, initially awarded nil market-value compensation. The reasoning was that the land's increased value, resulting from its rezoning from rural use to enterprise use in as part of the Aerotropolis, was caused by the same public purpose for as the acquisition, and therefore had to be disregarded under the Act.

Goldmate disagreed. In December 2024, the NSW Court of Appeal upheld its appeal, rejecting Transport for NSW's attempt to characterise the public purpose at a high level, remitting the matter to the Land and Environment Court for redetermination. Transport for NSW's application to the High Court for special leave was unsuccessful.

On remitter, Duggan J assessed compensation at $38,353,979.78 – which is significantly higher than the original nil determination.

What Gets Disregarded, and Why

Under the Act, when determining the market value of compulsorily acquired land, any increase or decrease in value caused by the carrying out of, or the proposal to carry out, the public purpose must be disregarded. The policy behind the provision is simple: a landowner should not receive a windfall from the very project that made the acquisition necessary.

But that principle depends entirely on identifying the correct public purpose. Define it too broadly, and you risk disregarding value changes that have nothing to do with the acquiring authority's project. That was the error at first instance.

The Court of Appeal on remitter, held that the relevant public purpose is limited to a purpose the acquiring authority is legally empowered to pursue. Transport for NSW derives its acquisition power from the Roads Act 1993 (NSW). Its purpose was therefore confined to the construction of the M12 Motorway, and nothing more.

Attempts to characterise the public purpose as encompassing the entire Western Sydney Infrastructure Plan, a coordinated package of road and planning measures spanning multiple government departments, was rejected.

The Causation Question

With the public purpose properly identified as the M12, the critical question became whether the M12 caused the rezoning of Goldmate's land from rural to enterprise use. If it did, the rezoning uplift would be disregarded If not, Goldmate was entitled to compensation based on the enterprise zoning that existed at the date of acquisition.

Transport for NSW advanced an ambitious argument. it argued that the M12 and the rezoning were "mutually directly causative": each was necessary for the other, and that either could therefore be treated as having caused the other for the purposes of the Act.

Duggan J rejected this. The evidence instead identified a single catalyst: the Federal Government's 2014 announcement that it would proceed with Western Sydney Airport.  That decision triggered coordinated State Government responses in infrastructure and planning, including the rezoning of land across the Aerotropolis and the planning of roads such as the M12.  

As her Honour put it, the motorway facilitated traffic movement from the rezoned land, but it was not the foundation for the rezoning decision. The increase in land value was attributable to the Federal Government's airport decision, not to Transport for NSW's road project.

Her Honour also emphasised that section 56 of the Act is concerned only with changes in value for which the acquiring authority itself is responsible. A broad "but for" analysis that ignored the specific factual context was inadequate.

Practical Significance

The Goldmate appellate and remitter decisions establish principles of real consequence for compulsory acquisitions, particularly in Western Sydney but more generally:

1. Public purpose must be properly confined. Acquiring authorities cannot aggregate value impacts caused by other arms of government, different statutory schemes, or broader policy initiatives simply because those initiative coexist with their project.

2. Causation is a factual inquiry, not a formula.  Where multiple government decisions have contributed to a change in land value, the question is which decision the acquiring authority was actually responsible for, and whether the causal link is direct rather than incidental.

For landowners in the Aerotropolis, these principles matter now. A number of acquisition matters remain on foot, and the Goldmate framework will shape how compensation is assessed across them. How the public purpose is characterised, and what truly caused changes in the value of your land, can have significant financial consequences – as Goldmate's journey from nil to $38 million makes clear.

If you would like to understand how these principles apply to your situation, please contact our people.

Eollyn Cortes 0478 727 395

Sagang Chung 0431 435 333

Helen Jeon 0457 811 882