Around 300 people gathered at Caves House to rally against a development earmarked for Smiths Beach in Yallingup.
The development has faced criticism from community members who are concerned about new state government laws which would see the application skip the local government approval process.
The site has been marred with controversy since the early 2000's when previous developers Canal Rocks Pty Ltd first put forward a proposal to develop the area.
Related content: Residents speak up about Smiths Beach development
Saves Smiths Beach spokesperson David Mitchell said if the developer believed his proposal was far better than what planning laws allowed for than why was he using the approval "fast-track" pathway.
"What is he hiding?" Mr Mitchell said.
"If he was simply transparent with the community and the local council there wouldn't be a such a negative response to his approach.
"'The council, local MP's and the community have all publicly stated that this development is not appropriate to be rushed through the fast-track' planning approval pathway.
"We have a unique situation here where the only two people wanting to bypass the local planning laws are the developer and the Planning Minister who has the power to stop the application."
A Smiths Beach Project spokesperson said in order for the development to be delivered they must obtain more than 40 separate approvals, management plans and clearances.
"These extensive and rigorous approvals relate to a range of planning, environmental and construction requirements," the spokesperson said.
"Obtaining the approvals is a time and resource intensive process that requires coordination across a wide range of State and Federal Government agencies.
"From our perspective, the State Development Assessment Unit simply enables better coordination of inputs from a wide range of government agencies and local government that will be referred the application as part of the assessment process.
There is a public consultation period and public input into the process remains significant.- Smiths Beach Project spokesperson
"There is a public consultation period and public input into the process remains significant.
"The project will be ready to commence as soon as approvals are received because the most important work has been done up front, including the design of every potential building and holiday home, which is unheard of for an application of this nature."
The spokesperson said the proposal was being prepared and submitted by the landowners, which comprised of Adrian Fini and three other Western Australian families, and not Hesperia.
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