​Victoria Ave in Unley Park has been voted South Australia's most prestigious street in a survey of property experts conducted by The Advertiser.

• The survey polled 20 leading real estate agents to determine which streets they rated as the best address.

• They gave five points to their top pick through to one point for their fifth selection.

• Victoria Ave was the clear winner with 66 points.

Adelaide’s most prestigious address, Victoria Ave at Unley Park is home to some of our most successful South Australians

• — high-flying lawyers, doctors and business people all call the tree-lined street home.

• And then there’s the “old money” — the family dynasties who simply pass their grand home from one generation to the next.

As a result, sales on the plane tree-lined street are few and far between, each new listing triggering action among SA’s elite who fight to secure their slice of the South Australian real estate dream.

• It is often ranked as Adelaide’s top address, but new research has revealed many of the mansions that line Victoria Ave at Unley Park have little or no protection from demolition.

Master of Architecture student Kenan Henderson has found many of the houses in the well-known precinct, which includes Northgate St and Rutland and Miegunyah avenues, were built by architect Henry Cowell, mostly for wealthy landowner Simon Harvey.

• Despite their national significance, the research assistant claims few of the properties are state heritage-listed.

• Rutland Hall or ‘Yerna Yerna,’ 2A Rutland Ave (formerly 12 Victoria Ave).

• “Currently, many of these buildings are completely without any heritage protection and not even listed under local or contributory protection,” Mr Henderson, of Forestville, said.

• “Victoria Ave is legendary as a desirable street and this significant collection needs to be protected.

“Unley Council has a zone that provides some level of protection but doesn’t guarantee it in its current state. “I suspect most Adelaide residents will be shocked to learn they are under threat.”