Vacancy, Leasing Cost, and Rent-Reduction Stress Tests

Stress the lease cycle, not one percentage

A 5% vacancy allowance can be useful for portfolio comparison, but it does not show the cash path when a real tenant leaves. The owner can face notice period, arrears, inspection, restoration dispute, cleaning, repair, equipment replacement, advertising, brokerage, guarantee screening, free rent, lower new rent, and delayed first payment.

Model the lease event month by month for the actual unit and tenant segment. Keep loss of rent, cash expense, capital improvement, deposit use, and manager fee on separate lines.

Build the base lease case

Record current base rent, charges, lease type, expiry, notice, tenant history, deposit, guarantee, manager, unit condition, equipment age, and supported achieved market rent. For a multi-unit property, map expiry and concentration across the roll.

The base case should follow the existing contract, not assume immediate mark-to-market. If a fixed-term lease ends, confirm the documentation and notice process. If an ordinary lease continues, do not insert vacancy at the printed anniversary without a factual reason.

Use current operating expenses and a unit capital reserve. The association's condominium reserve does not replace the landlord's unit equipment reserve.

Model three turnover paths

Fast reletting: tenant leaves in acceptable condition, cleaning and minor work finish quickly, the unit is marketed before handover where permitted, achieved rent matches current, and vacancy is one month.

Base turnover: two months without rent, cleaning and repairs, one month of leasing commission or equivalent cost, guarantee and administration, and a small rent adjustment supported by evidence.

Stressed turnover: arrears or dispute, delayed access, three to six months vacancy, larger restoration and equipment, two months of incentives or leasing cost, rent reduction, and legal or specialist expense.

State every yen and month. Do not call the stressed case “conservative” without showing its mechanism.

Include rent reduction and incentives

Asking rent may be JPY 200,000 while the achieved deal includes one free month and a leasing fee. Over a two-year expected occupancy, one free month reduces effective rent by roughly 4.17% before other incentives. Compare gross contracted and effective rent.

Test 5%, 10%, and evidence-based rent changes. A JPY 200,000 rent reduced 10% loses JPY 240,000 per full year after occupation. Combined with two vacant months, first-year gross cash can fall JPY 600,000 before works and leasing costs.

For furnished or short-term models, include utilities, furniture replacement, cleaning, platform or operator cost, seasonality, and legal operating days rather than borrowing a long-term vacancy assumption.

Separate restoration, repair, and improvement

Use move-in condition, lease, national or local guidance where relevant, invoices, and professional advice to estimate tenant versus owner responsibility. Do not assume the deposit pays all work. Normal wear, equipment age, deferred owner maintenance, and desired upgrades can remain with the owner.

Classify owner cash as cleaning, repair, replacement, or improvement. The tax and depreciation treatment can differ. The investment model should show cash regardless of deduction timing.

Obtain contractor scopes before acquisition for visibly old kitchens, baths, air conditioners, water heaters, flooring, and waterproofing.

Add building and finance interaction

A vacancy can coincide with a special assessment, reserve increase, interest-rate reset, tax payment, or insurance renewal. Test liquidity across the whole property rather than treating each risk independently.

Debt service continues during vacancy. Calculate debt-service coverage from property net income, then monthly cash reserve needed under the turnover paths. Principal reduction is an equity movement but still consumes cash.

For a single-tenant property, model complete income loss. For a ten-unit building, model one normal turnover and one concentrated event involving the largest units.

Use probability carefully

Do not invent a precise probability from one building. Use lease history, tenant segment, achieved market evidence, manager experience, unit condition, and competing supply to rank scenarios. Report expected value only if probability inputs are supportable; otherwise show discrete outcomes and the buyer's ability to carry each.

Track actual vacancy, work, incentives, and rent after purchase. Replace assumptions with property history before the next acquisition or sale.

Decision table

Show months vacant; contracted and effective new rent; deposit deductions; cleaning; repair; equipment; improvement; leasing and guarantee; manager; legal; lost rent; total cash; debt service; tax treatment note; and time to recover the cost. Compare the result with acquisition yield and equity return.

A headline gross yield that fails one ordinary turnover is not a stable investment case.

Convert the test into a purchase limit

A stress test is useful only if it changes a decision. Calculate the maximum price that preserves the required cash yield or debt coverage under the base, downside and severe cases. If the seller's price works only when every tenant renews, rent never falls and no major work occurs, that dependency belongs in the investment conclusion—not in a hidden spreadsheet assumption.

Keep market and execution risk separate. Market risk is weaker achieved rent, longer absorption or higher concessions across comparable units. Execution risk is slow approval, poor photographs, delayed cleaning or a manager failing to follow enquiries. The response differs: price protects against the first, while contract controls, reporting and manager replacement address the second. Re-run the model annually using actual lease events so the original underwriting becomes a measurable operating benchmark.

Primary sources

• MLIT — Rental housing management portal: https://www.mlit.go.jp/tochi_fudousan_kensetsugyo/pm_portal/
• MLIT — Rental housing guide: https://www.mlit.go.jp/jutakukentiku/house/jutakukentiku_house_tk3_000017.html
• National Tax Agency — Real-estate rental income and necessary expenses: https://www.nta.go.jp/taxes/shiraberu/taxanswer/shotoku/1370.htm
• MLIT Real Estate Information Library — transaction and area evidence: https://www.reinfolib.mlit.go.jp/

Reviewed against the linked sources on 23 August 2026. Replace every scenario input with the actual lease, unit, manager, and market evidence.