The City of Stirling lodged Amendment 32 in September last year after officers identified that continued high-density development on land coded below R60 would be unsustainable.
The City identified the possibility of more than 250,000 dwellings being built in suburban areas of Stirling.
Ms Harvey said she had resolved to support Amendment 32 after meeting with locals concerned with the long-term impact of high-density development in Scarborough.
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"I have also been contacted by land owners who are supportive of the multiple dwelling zoning as it does have the potential to increase residential property values for those whose properties it applies to.
"I am supportive of the intent of Amendment 32, which is currently with the WAPC, that will limit the multiple dwelling zoning to densities R60 and above because I know that the City has an active program to achieve its infill targets,"
Mirrabooka MLA Janine Freeman questioned Planning Minister John Day in Parliament last week on the delay to a decision on Amendment 32.
"Balga residents are being overrun by developers trying to beat the changes to zoning on the basis of this amendment; an amendment the minister has been considering for just short of 12 months," she said.
Mr Day said it was still with the WA Planning Commission but he expected a recommendation soon.
Stirling Mayor Giovanni Italiano urged Mr Day to come to a decision on the matter in March, after identifying a push from developers to receive approval on R40 blocks before the Amendment was enacted.