Monomeath ave is in canterbury. Mont albert road is traditionally the golden mile but mainly due to the homes on its south side which are in canterbury. Within Balwyn proper, the 2 most expensive streets are definitely Winmalee Rd and Yarrbat ave which have the best views and most homes are on larger blocks. Both streets also are in the balwyn high zone which translates to slightly higher prices.
Yarrbat Avenue is a really nice location to reside in. Recently there is a lot of residential development - new mansions being built along the street. Land value has consistently been increasing and a number of offerings often did not make it to public auction and quickly been sold privately. Close to parks, close to Balwyn High School (top state school), close to private school (reachable by trams), and close to Whitehorse Rd shopping strip. But importantly away from high density development and noisy traffic on the main road.
Yarrbat Ave, Gordon St, Boston Rd, Narrak Rd and Monash Ave have the best tree-lined Pinoak avenues with large mega mansions. Prices in Balwyn are very expensive. It is seventh most expensive suburb in Melbourne with a median house price of $1.975 million that puts Balwyn in top 10 suburb. People who cannot afford Balwyn, Mont Albert and Surrey Hills will have to shift down south east to Burwood, Mount Waverley and Glen Waverley for a reasonable price if they want a mega French provincial mansion.