​The expert design review panel evaluating James Packer's proposed $1.2 billion hotel and casino resort at Barangaroo has a suggestion for the billionaire: tone down your corporate logo.

Sources confirm the panel scrutinising the development, convened by Planning Minister Rob Stokes, has suggested limiting the number of illuminated gold Crown logos on the building.

In its preliminary report on the Crown Resort building, the panel said it would consider its "visual impact on views and vistas" including "impacts of branding and logos located within iconic 'Australian' views".