Landowner path
Find out whether subdivision, a granny flat, dual occupancy or townhouses are plausible.
Start with zoning, but do not stop there
Zoning points you toward possible uses. The real answer also depends on overlays, built-form controls, minimum lot sizes, access, slope, services, approvals history and market value.
Developer path
Test the highest and best use, then calculate the max price to pay.
Fast check
Use the zoning lookup for the first pass.