Real Estate Underwriting Basics
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I'm a second-year business student in Hong Kong, and I want to get into real estate private equity at a regional platform. Can you explain how investors decide whether a property is worth acquiring? I keep hearing about underwriting, but I want the practical version, especially how it fits into due diligence.
Yes. In property investing, underwriting is the process of turning a building into a base case and asking, is the price justified by the cash flow and risk? During due diligence, investors are checking whether the seller's story matches reality, then testing how much rent, occupancy, expenses, and exit value they can reasonably underwrite. If the property cannot produce enough return after capex, vacancies, and debt costs, it is usually not worth acquiring. The key is not just what the current income is, but how durable that income is under stress.
That makes sense. When I look at a deal, what should I focus on first in the rent roll? I know it's a list of tenants and rents, but what are investors actually trying to learn from it?
The rent roll is one of the first documents to sanity-check because it tells you who is paying, how much, and when leases expire. Investors use it to identify concentration risk, below-market or above-market rents, delinquency, short remaining lease terms, and any weird lease structures. For example, if one large tenant makes up a big share of income, that is a risk even if the building looks full today. You also want to compare the rent roll against bank statements and signed leases, because underwriting is only as good as the data behind it.
How do cap rates come into that? I understand the basic formula, but I am not sure how buyers use cap rates when they decide what price to pay.
Cap rate is basically the market's shorthand for value relative to current net operating income. A lower cap rate means buyers are paying more for each dollar of income, usually because they believe the cash flow is safer or has better growth prospects. In underwriting, you would estimate stabilized NOI, choose a reasonable exit cap rate, and compare that implied sale price to your purchase price and target return. The tricky part is that cap rate is not just a math input, it reflects market sentiment, asset quality, lease risk, location, and liquidity.
Got it. But in Hong Kong or other regional markets, vacancy seems like a big issue. How do investors decide what vacancy assumption is realistic instead of just using the current occupancy?
They usually do not assume current occupancy will last forever. A good underwriter separates current vacancy from stabilized vacancy, then asks what level of downtime is normal for that asset type and submarket. For example, a mall, office tower, and logistics warehouse will each have different leasing cycles and tenant churn. Investors look at historical vacancy, lease expiries, market absorption, and re-leasing velocity, then set a conservative assumption that reflects the weakest plausible case, not the best recent month.
If the deal still looks good on the base case, how do I think about downside cases? I want to know what would actually make the acquisition unattractive.
Downside cases test whether the deal survives pressure. The common stress points are higher vacancy, lower renewal rents, slower lease-up, higher expenses, and a wider exit cap rate. If a modest drop in NOI makes the IRR collapse or the equity gets impaired, the deal is fragile. In diligence, I would build at least one downside case where occupancy falls, one where rents reset lower, and one where exit pricing is weaker, then see whether the project still covers debt service and preserves capital.