Real estate feasibility study: a practical guide.

What a feasibility study really is

A feasibility study is a structured answer to a single question: given this site, this program, and today's market, does the math work? It blends three lenses — market, physical, and financial — and lands on a recommendation you can defend to partners, lenders, and yourself.

It is not a pitch deck. It is not a pro forma you optimize until the IRR clears the hurdle. Done well, it tells you when to walk away as often as it tells you when to push forward.

When to run one

The right moment is earlier than most people think — usually before you put the land under contract, or during a short inspection period. The whole point is to make the cheapest possible mistake: killing a bad deal in a spreadsheet instead of in entitlements.

1. Market analysis

Market work answers who pays, how much, and how often. For a multifamily deal that means achievable rents per unit type, absorption pace, comparable concessions, and the supply pipeline within the trade area. For for-sale residential, it's price per square foot, days on market, and the price band the neighborhood actually clears.

Three habits separate a useful market section from a decorative one:

• Comp like-for-like. Match vintage, finish level, unit mix, and amenity tier. A 2015 mid-rise is not a comp for a 2026 podium.
• Pressure-test the pipeline. Pull permits and active construction within a 1–3 mile ring depending on density. New supply landing the same quarter you do is the single biggest threat to your rent assumption.
• Write down what would change your mind. If rents are 8% below your underwrite, do you kill it, redesign, or accept it? Decide before the data comes in.

2. Physical and regulatory feasibility

Before the financial model is worth anything, the building has to be legal and constructible. That means zoning (use, height, FAR, setbacks, parking), site constraints (flood zone, easements, soils), and the building type you can actually deliver at this density.

Building type drives more of the outcome than people give it credit for. A garden walk-up, a wrap, a podium, a Type I tower, build-to-rent, and a condo all behave differently on cost, schedule, parking ratio, and exit. Two of them can be feasible on the same dirt and the third can be a value-destroyer. The feasibility study is where you compare them honestly, not after you've already paid an architect for SDs.

3. Financial modeling

Once you have a defensible program and market, the model is mostly bookkeeping with judgment. The core sections:

• Development budget — land, hard costs (broken out by trade), soft costs, financing, contingency (5–10% hard, 3–5% soft is a reasonable floor), and a developer fee that reflects real overhead.
• Operating pro forma — gross rents, vacancy and credit loss, other income, operating expenses by line, and a capital reserve. Trend to year 10 or to stabilization plus a hold.
• Capital stack — senior debt sized by the tighter of LTC and DSCR, any mezz or preferred equity, and common equity. Lock the assumptions to today's quotes, not last year's.
• Returns — untrended yield-on-cost vs. market cap rate (the development spread), levered and unlevered IRR, equity multiple, and cash-on-cash by year.

The single most useful metric on a ground-up deal is the development spread: your stabilized yield-on-cost minus the going-in cap rate at exit. If that spread is thin, no clever financing rescues the deal.

4. Risk and sensitivity

A point estimate is almost never the answer. Run sensitivities on the three or four variables that actually move the outcome: rent, hard cost, exit cap, and interest rate. Two-way tables (rent × exit cap, cost × rent) tell you where the cliffs are.

Then write a short risk register: the five things most likely to break the deal, and what you'd do about each. Lenders read this. So should you.

5. The recommendation

End with a one-page summary: program, total cost, key returns, the main risks, and a clear go / no-go / restructure call. If you can't write that page cleanly, the study isn't finished.

Common mistakes

• Solving for the answer. If you keep nudging rent and cost until the IRR works, you've written a marketing document, not a study.
• One building type only. Comparing two or three feasible programs almost always changes the recommendation.
• Stale cost data. Hard costs have moved hard in both directions over the last few years. Use current bids or a recent GC budget, not a per-foot rule of thumb from a prior cycle.
• Ignoring the schedule. Six extra months of carry and interest can quietly erase your spread. Model the schedule with the same care as the rents.

How software changes the workflow

Most of what I described above used to live in a single, fragile Excel file passed between an analyst, a development manager, and an architect. The bottleneck was never the math — it was the time cost of testing more than one option. Building a clean model for a new site can take a week; testing five building types on it can take three.

This is exactly the gap FeasyBuild is built to close: a tool that lets developers run a real, defensible feasibility study across commercial real estate — multifamily, retail, office, industrial, and mixed-use — spanning more than two dozen building types, from garden, wrap, and podium to Type I towers, build-to-rent, and condos, in hours, not weeks. The point isn't to replace judgment. It's to make sure the judgment is being applied to the right deal, on the right program, with current numbers.

A short checklist

• Site, zoning, and constructible program confirmed
• Two or three building types compared
• Rents and sale prices tied to like-for-like comps
• Pipeline supply mapped within the trade area
• Current hard-cost basis (not rule-of-thumb)
• Capital stack quoted, not assumed
• Sensitivities on rent, cost, exit cap, and rate
• One-page recommendation with a clear call

If you're working through one of these and want a second set of eyes, you can get in touch.