Underwriting the property: the exit cap is the dangerous number

Underwriting a property is the work of turning a building into a spreadsheet: what it costs, what it earns, what it will earn after the plan, what the debt takes, and what it sells for at the end. The whole deal lives inside a handful of those assumptions, and they are not equally trustworthy. Some are close to known. One of them is a guess about the future dressed up as a number, and it moves the outcome more than anything else in the model.

The pieces of the model

The going-in numbers are the most knowable. The price is the price. In-place rents are what tenants actually pay today, and they should be read separately from pro forma rents, the higher numbers the sponsor believes the property can reach after the business plan. Operating expenses, and the expense ratio they imply, are checkable against the property’s actual history. Net operating income, rents minus operating expenses, drives everything downstream. The going-in cap rate is simply that net operating income divided by the price: a property earning $600,000 of net operating income bought for $10 million is a 6.0 percent cap. Debt terms, reserves for capital needs, and the operating assumptions fill in the rest.

The going-in numbers can be checked. The exit is a forecast, and the deal is most sensitive to the one number no one can know.

Why the exit cap rate is the dangerous one

The sale at the end is usually the largest single cash event in the deal, and it is built from two forecasts: the net operating income at exit, and the cap rate a future buyer will pay. That exit cap rate is the most consequential assumption in the whole model and the least knowable, because it depends on interest rates and market sentiment years out.

Watch how much it moves the answer. Suppose the plan lifts net operating income to $700,000 by year five. Sell at a 6.0 percent exit cap and the price is about $11.67 million. Sell at 6.5 percent, half a percentage point higher, and the price drops to about $10.77 million. That fifty-basis-point shift, a change smaller than markets routinely make, erases roughly $900,000 of value, which can be a large share of the investors’ entire profit. No amount of good operating over five years moves the outcome the way that half point does.

Here is the trap sponsors fall into. It is common to underwrite an exit cap rate equal to or lower than the going-in cap, assuming the market will be at least as generous at exit as it was at entry. That is not underwriting. It is optimism, a bet that cap rates will hold or compress, and cap-rate compression is a market gift, not a result the sponsor controls.

The structuring consequence

Underwrite the exit cap rate flat to the going-in cap, or expanded, never compressed, because assuming compression imports a market bet into a deal that is supposed to be about the property. If the deal only works when the exit cap is lower than the entry cap, it is not a real estate deal with a margin of safety. It is a leveraged bet that the market will be kinder in five years than it is today, and that is a wager the investors should be told they are making.