Underwriting is the financial model behind a deal, the spreadsheet that turns a building into a projected return. Every number in it rests on an assumption, and the quality of those assumptions tells you more about a sponsor than any glossy summary ever will. When you review a deal, you are really reviewing the judgment baked into the model.
You do not need to be a financial analyst to read underwriting critically. What you need is a feel for which assumptions matter most and a willingness to ask why each one was chosen. Aggressive inputs can make almost any deal look excellent on paper, so your job is to test whether the optimism is earned or merely convenient.
Rent growth and exit cap assumptions
Two assumptions move the projected return more than any others: how fast rents grow during the hold, and what the property sells for at the end. Rent growth should be grounded in the specific submarket and the business plan, not in a hopeful national average. If a model assumes rents climb five or six percent every year for five straight years, ask what justifies that pace. Steady, defensible growth in the low single digits is usually a healthier foundation than a hockey stick.
The exit cap rate is the rate used to estimate the sale price at the end of the hold. A lower exit cap implies a higher sale price, so a sponsor can inflate returns simply by assuming the property sells at a richer valuation than it was bought at. Conservative underwriting often assumes the exit cap is higher than the entry cap, building in a cushion in case the market is less generous in the future. When the exit cap is set below the entry cap, look hard for a reason, because that single assumption can carry an outsized share of the projected profit.
Debt structure
The loan is often the largest single force acting on a deal, and its structure deserves real scrutiny. Fixed rate debt locks in the cost of borrowing for a set term, which makes cash flow predictable. Floating rate debt moves with the market, so payments rise when rates rise. Floating debt is not automatically wrong, but it introduces a risk that needs to be understood and, ideally, hedged with a rate cap.
Look closely at the loan’s maturity and the length of the business plan. If the loan comes due in three years but the plan needs five years to play out, the deal carries refinance risk: the sponsor is betting that favorable financing will be available when the loan matures. That bet can go wrong if rates are high or lending tightens at the wrong moment. A sponsor who matches the loan term to the hold period, or builds in extension options, is taking that risk seriously rather than hoping it away.
Reserves and stress tests
Reserves are the cash set aside for the unexpected: a soft leasing period, a roof that fails early, a stretch of higher vacancy. A model that runs the property at full occupancy with no cushion is a model that assumes nothing ever goes wrong, which is not how real estate behaves. Meaningful reserves are a sign that the sponsor expects bumps and has planned to absorb them without a panicked capital call.
Stress testing is the discipline of asking what the returns look like if the assumptions miss. What happens if vacancy spikes, if interest rates jump, if a recession softens demand? Urban Sun Capital stress tests each deal against exactly those scenarios and holds meaningful cash reserves, because the goal is to survive a difficult stretch rather than to depend on a smooth one. When you review a deal, ask to see the downside case, not just the base case. A sponsor who can show you what happens when things go sideways has already done the thinking you most want done.
Sponsor basis
Basis is simply what the sponsor pays per unit or per square foot, and it quietly sets the margin of safety for the entire investment. Buying below replacement cost, the price it would take to build the same property new today, gives a deal durable protection. If you own at a basis well under what new construction costs, new competing supply is unlikely to appear at prices that undercut you, because no developer can build profitably at that level.
A low basis also gives you room to be wrong. If the business plan underdelivers or the market cools, a sponsor who bought cheaply still has options, while one who paid a premium has none. When you evaluate underwriting, anchor on the entry price relative to replacement cost and recent comparable sales. A disciplined basis will not rescue a bad plan, but it makes a sound plan far more forgiving, and that forgiveness is worth a great deal when conditions change.
A note on this material
This article is educational and not legal, tax, or investment advice. Every deal is different. Review the offering documents and consult your own legal, tax, and financial advisors before investing. Real estate investments carry risk, including the possible loss of principal, and projected returns are estimates that may not be achieved.
