Risks of Property: Concentration, Illiquidity and Interest-Rate Changes

What you will learn

• Why one leveraged property can dominate a household's net worth (concentration risk).
• What illiquidity costs in time and money, and the round-trip cost of buying and selling.
• How to calculate a refinancing shock at the end of the fixed-rate period.
• Practical ways to reduce each risk.

Explanation

Diversification and correlation inside a portfolio were covered in the ETF investing course; here we apply them to a single, large and leveraged asset.

Concentration risk

Concentration risk is the risk of having a large share of your wealth in one asset, one location or one tenant. A private property buyer usually owns one building in one town. Local events (a large employer leaving, a new road, changes in the neighbourhood) affect it fully. With a mortgage, the gross exposure (the full property value) can be several times your net worth.

Illiquidity

A sale usually takes months: valuation, marketing, viewings, the buyer's financing and the notary process. You cannot sell 10% of a flat if you need cash. In a weak market, a seller who must sell quickly may have to accept a lower price. In addition, the round-trip cost (buying plus selling) is high. If buying costs 10% and the seller pays a 3.57% broker fee, the price must rise by about 14% before you break even: 1.10 ÷ (1 − 0.0357) ≈ 1.141.

Interest-rate risk

Interest rates affect property owners in two ways:

• Refinancing risk: at the end of the fixed-rate period, the remaining debt is refinanced at the new market rate (lesson 3). If rates have risen, the payment rises, or the term becomes longer.
• Valuation pressure: when safe interest rates rise, investors tend to demand higher rental yields, which can mean lower prices for the same rent. This is a tendency observed in the past, not a fixed law.

Other risks to list

• Tenant risk: vacancy, unpaid rent, and the time needed to end a tenancy through the courts.
• Building risk: large repairs or modernisation, which in a flat can lead to a special levy (Sonderumlage).
• Regulatory risk: rent rules, energy-efficiency and heating requirements can change and may require investment. Check the current rules before buying.
• Personal risk: job loss, illness or separation can force a sale at a bad time.

Ways to reduce the risks

• Choose a longer fixed-rate period and a higher repayment rate to reduce the remaining debt.
• Keep a separate liquidity reserve for repairs and empty months, in addition to your personal emergency fund.
• Consider a forward loan (Forward-Darlehen), which fixes a rate for a future refinancing in exchange for a premium on the rate; it removes the risk of rising rates but you lose if rates fall.
• Limit how much of your net worth sits in property, and keep other assets that can be sold quickly.
• Run stress tests before you buy, not after.

Worked example

Hypothetical example: a household owns a flat worth €400,000 with a mortgage of €300,000 and has €100,000 in funds and cash. Excluded: taxes, selling costs (except where stated), changes in other assets.

1. Concentration. Net worth = €400,000 + €100,000 − €300,000 = €200,000. Property equity is €100,000, but gross exposure is €400,000, twice the net worth.

• Property value −10% (−€40,000): net worth falls to €160,000, which is −20%.
• Property value −20% (−€80,000): net worth falls to €120,000 (−40%); property equity falls from €100,000 to €20,000 (−80%).

2. Refinancing shock. Use the loan from lesson 3: €300,000 at 3.5% with 2% repayment, €1,375 per month. After 10 years about €228,280 remains, and about 19 years are left to repay it. New monthly payment for a 19-year payoff at different rates (annuity formula, rounded):

The rate change happens in one step on one day, and the household must be able to pay the higher amount or accept a much longer term.

Common mistake

Practice activity

A household owns a house worth €500,000 with a €350,000 mortgage and has €50,000 in other assets. (a) Calculate net worth and the effect of a 15% fall in the house value on net worth and on property equity. (b) At refinancing, €280,000 remains with 15 years left. The monthly payment for a 15-year payoff is about €1,934 at 3% and about €2,363 at 6%. Calculate the increase in euros and percent.

Key takeaways

• With a mortgage, gross exposure can be a multiple of net worth, so small price falls have large effects.
• Illiquidity and round-trip costs of about 14% in the example make short holding periods expensive.
• The refinancing date is a single, predictable risk event; plan for it with stress tests.
• Longer fixed periods, higher repayment, reserves and limits on property share reduce risk but do not remove it.

Next step

The next lesson shows a liquid way to invest in property: REITs and listed real estate companies.