Due Diligence for a Tenant-Occupied Japanese Property

Split diligence into tenancy and asset files

A tenant-occupied purchase needs two complete reviews. The tenancy file establishes possession, cash flow, deposits, rights, obligations, and management. The asset file establishes title, road, building, condition, condominium, insurance, tax, and capital expenditure. Strong rent history cannot cure a weak building, and a sound building cannot cure an undocumented lease.

Use a single reconciliation showing which evidence comes from the tenant, seller, manager, association, authority, registry, inspector, and bank. Record items that cannot be observed because of occupancy.

Verify every tenancy document

Obtain the executed lease, amendments, renewals, guarantor or guarantee-company agreement, deposit receipt, move-in condition record, identity and contact data held lawfully, payment ledger, bank or manager reconciliation, notices, complaints, repair requests, insurance, and management agreement.

Classify ordinary or fixed-term lease based on the documents and required process, not the seller's spreadsheet. Record start, expiry, renewal, termination, rent review, subletting, use, pets, restoration, repair allocation, guarantor, and notices. Identify side agreements or concessions.

For a fixed-term lease, obtain evidence of the relevant explanation and notices. Do not assume the printed end date guarantees vacancy. Obtain legal review if the investment depends on possession.

Reconcile money and liabilities

Separate base rent, common charges, parking, utilities, taxes where relevant, late payments, guarantee receipts, and one-time amounts. Reconcile at least twelve months where possible. Identify arrears and collection status.

The security deposit can create a repayment liability for the buyer. Confirm amount, deductions, transfer at settlement, and ledger treatment. Key money historically received by the seller is not recurring income. Future renewal fees should be forecast only from supported lease terms and realistic continuation.

Calculate effective rent and line-item expenses. Add management, condominium charges, taxes, insurance, repairs, leasing, vacancy, equipment, guarantee, and capital expenditure. Then run lease-end and tenant-default scenarios.

Define inspection limits

Obtain consent and protocol for any unit inspection. Respect tenant privacy and the lease. Record areas blocked by furniture, finishes, storage, or refusal. A non-invasive visit can still observe layout, visible damage, moisture, ventilation, equipment, and maintenance, but it is not a complete condition investigation.

Collect seller disclosures, prior repair invoices, tenant requests, photographs, move-in report, insurance claims, and building records. For a condominium, inspect common areas and review association documents fully. For a house, investigate road, boundaries, exterior, roof, underfloor and roof-space access where permitted, services, drainage, retaining walls, and unregistered work.

Create a post-vacancy inspection and work allowance. The narrower the access and historical record, the larger the unresolved condition risk.

Test lawful and actual use

Compare the lease use with planning, building status, fire requirements, condominium bylaws, insurance, and actual occupation. A residential lease used as an office, short stay, dormitory, or unapproved sublet can create different risks. Obtain facts without assuming that regular rent proves compliance.

For corporate housing, identify the contracting company, occupant, replacement rights, and notices. For retail or office, review licences, fixtures, restoration, consumption-tax treatment, and business interruption according to specialist advice.

If the buyer intends to change use after vacancy, commission that feasibility separately.

Review manager control and handover

The management agreement should state authority, fees, repair approval, emergency work, rent collection, deposit handling, inspection, reporting, contractor use, complaints, termination, and handover. Check whether the manager is appropriately within the current rental-management framework where applicable.

Ask how tenant money is segregated, how arrears are escalated, and who holds keys. Review owner reports against the raw ledger. A remote buyer needs a named emergency and notice process from the first day of ownership.

At settlement, transfer the complete file and send required ownership and payment instructions through a controlled process. Protect personal data and avoid unnecessary circulation.

Contract the known facts

Schedule the lease, rent, deposit, arrears, guarantee, notices, manager, disputes, repairs, and access limits in the transaction documents. Allocate pre-closing breach, misstatement, rent received after cut-off, deposit adjustment, and delivery of records. If vacant possession is promised, define the condition and consequence of failure.

The buyer should be able to answer three questions before contract: what legal relationship transfers, what cash is evidenced, and what physical condition remains unknown. If any answer depends only on the listing, diligence is incomplete.

Worked downside example

Assume scheduled rent is JPY 240,000 per month and the listing presents JPY 2.88 million annual income. The ledger shows one late month, the lease expires in eight months, the deposit is JPY 480,000, and the occupied unit has not been inspected behind built-in storage. The manager expects a one-month leasing fee, cleaning, and replacement of an old water heater at turnover.

The buyer should model current lease cash, then a turnover case with two vacant months, JPY 240,000 leasing cost, cleaning, water-heater replacement, and a rent supported by achieved evidence. The deposit remains a liability subject to lawful deductions. A post-vacancy concealed-work allowance should remain visible. None of those assumptions proves the tenant will leave or the costs will occur; they show the capital needed if the lease cycle turns against the headline yield.

Compare that downside with the price and reserve before relying on the current tenant as a permanent feature.

Privacy and communication discipline

The buyer needs sufficient tenancy evidence without turning diligence into unnecessary circulation of personal data. Ask the seller and manager to redact or control identity, banking, health, family, and guarantee information that is not needed for the acquisition decision. Use secure transfer and keep a recipient record.

Do not contact the tenant directly without an agreed route. Uncoordinated questions can breach trust, disrupt the tenancy, or create inconsistent statements. The seller or authorised manager should arrange access and clarify what information may be shared.

After closing, send ownership and payment changes through a verified process so the tenant is not exposed to payment-redirection fraud. Retain only the records needed to operate and comply with the lease. Good diligence examines the legal relationship while respecting the person occupying the home.

Primary sources

• MLIT — Rental housing management portal: https://www.mlit.go.jp/tochi_fudousan_kensetsugyo/pm_portal/
• MLIT — Rental housing guide for foreign tenants and landlords: https://www.mlit.go.jp/jutakukentiku/house/jutakukentiku_house_tk3_000017.html
• MLIT — Existing-home condition investigations: https://www.mlit.go.jp/tochi_fudousan_kensetsugyo/const/tochi_fudousan_kensetsugyo_const_tk3_000001_00063.html
• National Tax Agency — Real-estate rental income: https://www.nta.go.jp/taxes/shiraberu/taxanswer/shotoku/1370.htm
• RETIO — Buying and selling Q&A: https://www.retio.or.jp/info/qa/qa1/

Reviewed against the linked sources on 23 August 2026. The actual lease, asset documents, access, and transaction-specific professional advice control.