A percentage has an appealing tidiness. It compresses a building, its occupiers and a long set of assumptions into a number that can fit beside a photograph. That convenience is also its weakness. Unless the numerator, denominator and period are clear, the number may conceal more than it explains.
This is a framework for reading a property brief, not a recommendation to buy an asset or an estimate of market returns. No yield shown in a seller’s material should be treated as independently verified simply because it has been reformatted into English.
Ask which income is being described Contractual rent, money actually collected and projected rent after a refurbishment are different things. A brief should name the basis, date and source of each. Vacant space does not earn a projected rent merely because a comparable unit has an appealing asking price.
Ask whether service charges, temporary concessions or other receipts have been included. Ask how arrears, deposits and unusual payments are treated. Do not quietly substitute a convenient figure for a missing one.
Make the denominator equally visible A percentage based on an asking price is not the same as one based on a completed acquisition cost. Financing, taxes, transaction costs and future capital work may require separate treatment. The appropriate calculation depends on the question being asked and should be reviewed with qualified advisers.
The most useful display is often less elegant than a single number: stated annual income; stated basis; listed operating costs; items excluded; price basis; and the documents still needed. Clarity beats a polished but ambiguous percentage.
An arithmetic illustration, not a market quote Suppose a purely hypothetical property has annual collected rent of KRW 300 million and specified recurring property expenses of KRW 60 million. On those assumptions alone, income after those specified expenses is KRW 240 million. Against a hypothetical KRW 6 billion purchase price, that figure divided by the price is 4 percent.
That is only arithmetic. It does not establish market value, cover every possible cost, represent financing or tax outcomes, or forecast the next year. Change any input and the result changes. A reader should be able to identify those limits without searching the fine print.
A lease schedule tells another part of the story Income is attached to occupiers and agreements, not just floor space. Ask the responsible agency for the permitted information needed to understand occupancy, payment basis, expiry dates and material obligations. Tenant identities and confidential documents do not belong in a public advertisement merely because they are useful in due diligence.
A website can help organize the questions. It cannot independently certify a rent roll without the underlying evidence and the appropriate review.
Keep the building in the picture Even a carefully defined return measure cannot explain everything about access, condition, adaptability and future capital needs. These deserve inspection and professional review in their own right.
An informative property introduction does not avoid numbers. It makes their limits visible. The reader should leave with better questions, not a false sense that a complex decision has already been reduced to a percentage.
