There is no detail offered here to explain the extent of the proposal. But, shade sail cloth should not be allowed in front of highly significant heritage buildings because (a) they are buildings that have not needed such structures for the past 150 years of their existence (b) they negatively impact the appreciation of the building by residents and visitors, especially those who take photographs.
Visual clutter in highly significant heritage precincts is to be avoided. Already in this location is a plastic flapping sign in the street advertising the markets which is cheap and tacky and should be removed.
The negative impact of such sail cloth can be seen in North Fremantle in front of the former primary school there on Stirling Highway where sail cloth has obliterated the view of the attractive heritage building.