I have actually looked at this site for a few of my clients. The zoning is R25 as it is a corner site in the Town of Bassendean TPS. Most people would look at this site and assume four units at R25 (1654/350 = 4.72), however I'm fairly confident of squeezing an extra block on this site.
The sellers are seeking above $1.2m, and it is going to auction. That works out to being $240k a block. some unrealistic vendor is trying to sell blocks next door for $600k, which I doubt they are going to get - mind you I'm sometimes surprised in this market.
http://www.realestate.com.au/property-residential+land-wa-ashfield-200573283
My rough feaso looks like:
Land: $1,200,000
Cost in: $55,000
Holding: $70,000
Subdivision: $120,000
Cost Out: $47,500
Contingency: $15,000
Costs: $1,507,500
End Sale:
2 blocks facing River: 350,000
3 other: 300,000
total: $1,600,000
No GST included.
$100k seems pretty light on for a $1.5m land subdivision, I would be wanting closer to 25% - 30% on cost. However, a builder will probably take on this site and also make the margin in the build.
One big concern is the proximity to the river, I would be getting a Geotech in that area!