In a surprise move, the City of Subiaco has backed an amalgamation with the City of Perth and opted out of a western suburbs merger.
Subiaco mayor Heather Henderson said the council had decided to submit two proposals to the Local Government Advisory Board for consideration - a boundary change to annex the suburb of Jolimont from the Town of Cambridge and a merger with Perth "under perceived duress".
In the proposed merger with Perth, Subiaco supports Perth's submission to the LGAB which advocates boundaries encompassing the University of WA, Crown Perth, the QE2 Medical Centre and Kings Park as well as parts of Nedlands, Burswood and the Belmont Racecourse.
Under the plan, only a part of the City of Vincent would be included within the expanded capital city council.
The Subiaco council opted for this proposal despite a risk assessment which said a merger with an expanded Perth could lead to a loss of independence and a loss of community representation.
The assessment said also that the capital city's town planning objectives could threaten Subiaco's heritage fabric.
"We've taken the time to listen to and consult with our community," Ms Henderson said.
"Council believes that submitting these two proposals is in the best interests of our community."
The council's poll of residents found a merger with an expanded Perth was the least preferred option, with 71 per cent against.
The most preferred option was a merger with Cambridge.
Cambridge mayor Simon Withers said he was baffled by Subiaco's decision to go against the wishes of their residents.
Lord Mayor Lisa Scaffidi said Subiaco's proposal warranted consideration.
"On the surface, having Subiaco within the City of Perth appears to be more logical than having lower-density northern areas of Vincent," Ms Scaffidi said.