The worlds of architecture and politics have been intersecting in Sydney recently, mostly in The Rocks.

A couple of months ago, Heritage Minister Mark Speakman took the unprecedented step of making a personal submission on architectural grounds against a proposed "glass box" development in the historic Sydney neighbourhood.

Then Finance Minister Dominic Perrottet took a similarly unusual step of rejoicing in the impending demise of the Sirius Building in The Rocks, declaring it as "about as sexy as the car park at my local supermarket".

Now another multimillion-dollar development proposal has been lodged for the area, which may again test the aesthetic judgments of Mike Baird's cabinet.