By Stella Qiu

SYDNEY (Reuters) -Australia’s affordable housing push has arrived in the wealthy Sydney suburb of Mosman, where new planning laws now challenge longstanding resistance to development in the leafy area known for mansions and sweeping harbour views.

State authorities in Sydney and Melbourne – Australia’s two biggest cities – are stripping some planning powers from suburban councils, including ones like Mosman that have created national headlines over opposition to new housing from older, wealthier constituents.

The broad policy shift comes as political deference to NIMBY (Not In My Backyard) sentiment gives way to demands for more housing from younger voters whose electoral heft now rivals the traditionally powerful baby boomer bloc.

In Mosman, there are fears the reforms w

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