I say that one a lot, because it’s usually the line standing between a developer and a property they’ve already fallen for. The site has a story — a rezoning that “should” go through, a severance everyone “expects” to get approved, a use the owner swears is coming. None of that is a fact yet. Highest and best use is the framework that keeps you from paying for the story before it’s true.
The Four Tests, in Order
Highest and best use isn’t one question. It’s four, and they only count in sequence.
Legally permissible — what does the current zoning and policy framework actually allow, today, in writing? Not what a planner thinks council might approve. What’s permitted now.
Physically possible — could the use fit on this lot, given its dimensions, access, topography, and servicing? A use can be legal and still not fit the ground.
Financially feasible — does it pencil? A use can be legal and physical and still lose money once land cost, carrying cost, and construction cost are in the model.
Maximally productive — of everything that clears the first three tests, which produces the most value? This is the step people skip to, and it’s the one that means nothing without the other three underneath it.
A property can fail at any step. A use that’s profitable on paper but depends on an approval you don’t have isn’t a highest and best use — it’s a bet. Price the bet, don’t pay for it as if it’s already won.
Why the Zoning Label Isn’t the Answer
Two sites with the same zoning designation can have completely different development potential. Lot geometry, access, grade, servicing capacity, heritage overlays, environmental features — any one of these can turn an identical zoning label into a different answer. Pulling the zoning bylaw tells you the permission. It doesn’t tell you what the site will actually support.
That’s what a massing pass is for — not a design, and not an approval, just a reality check on how much could plausibly fit once setbacks, height, coverage, parking, and access are accounted for. Run it three ways: a conservative scenario that fits comfortably inside the existing framework, a target scenario that reflects what you’re actually trying to build, and an upside scenario that only works if a variance or policy change comes through. Keep those three separate. The upside number is the one people quietly let become the plan, and it’s the one with the least underneath it.
Turning It Into a Decision
Before you write an offer, you should be able to answer, in order: what’s permitted today, what fits the lot, what it costs against what it returns, and — only after those three hold up — what the strongest version of that use actually looks like. If you can’t answer the first one with a bylaw citation instead of a feeling, you’re not ready to answer the fourth.
The questions that usually still need a planner, surveyor, engineer, or municipal staffer before you can trust your own numbers: does the lot configuration actually work for the intended use, is the servicing capacity there or is it an assumption, and what’s the real gap between what’s zoned and what you’re hoping gets approved. Desktop research gets you most of the way. It doesn’t get you all the way.
This Is the Discipline, Not the Whole Deal
Highest and best use tells you what a site can become. It doesn’t tell you how to fund it, what the approvals will actually cost in time and dollars, or what your exit looks like if the market shifts mid-project — those are their own layers, and they come after this one, not instead of it.
That’s the real value of running this inside the Land Development Fast Track course and the LDA Community — testing a site against this framework with people who’ve already paid for skipping a step, instead of finding out the expensive way on your own first deal.
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