Buying an apartment building in Ontario: what to check first.

Updated October 3, 2026 · DF Property Management

The due diligence window

Most multi-residential purchases in Ontario are conditional on due diligence for a set number of days. That period goes fast. Arrive with a checklist, a team (lawyer, lender or mortgage broker, building consultant, accountant, property manager) and a clear request list for the vendor.

1. Audit the rent roll

The rent roll is the foundation of the price. Verify every line.

• Match leases to the roll. Unit, tenant names, rent, start date, deposits held, parking and storage charges.
• Check rent increase history. Copies of N1 notices for each unit. Increases that weren't properly served may be void and the extra rent recoverable by the tenant.
• Look at actual deposits. Bank statements showing rent received, not just rent charged.
• Find the arrears. Aged receivables, N4s served, Landlord and Tenant Board applications filed or pending, and orders not yet enforced.
• Last month's rent deposits. Confirm amounts held and whether annual interest has been paid or applied. You'll take on these obligations at closing.
• Ancillary income. Laundry, parking, storage, rooftop telecom leases, signage. Read the underlying contracts.

2. Estoppel certificates

Ask the vendor to obtain signed tenant acknowledgements (often called estoppel certificates) confirming each tenant's rent, the date it was last increased, deposits paid, and any side agreements or disputes. Not every tenant will sign, but discrepancies on the ones who do are revealing. For commercial units in mixed-use buildings, estoppels are standard and should be a closing condition.

3. Rent control status and AGI history

• Which units are guideline-exempt? Units first occupied for residential purposes after November 15, 2018 are generally exempt from the rent increase guideline. In most older buildings, that applies only to new additional units — basement or added suites — and only if they were legally created.
• Above-guideline increases. Ask for any AGI applications and orders. A recent AGI may have phased increases still to come — or reductions when the capital costs are fully recovered.
• Rent reductions. Look for orders or agreements reducing rent for lost services, reduced municipal taxes or other reasons.
• Market gap. The difference between in-place and market rents is upside only over time, through natural turnover. Don't price the building as if you'll capture it quickly.

4. Building condition

Commission a building condition assessment from an engineer, not just a general home-style inspection. For a mid-rise or high-rise, add specialists where warranted: parking garage condition survey, balcony review, elevator condition report, roof survey, and a designated substance survey (asbestos is common in buildings of the 1950s–1980s). Translate the findings into a capital plan and price it into your offer.

Also check:

• Fire Code inspection records, annual reports and any outstanding Fire Code orders.
• TSSA licences for elevators and any outstanding orders.
• Open building permits and work orders from the municipality.
• Environmental history — former heating oil tanks, adjacent uses — through a Phase I environmental site assessment, which lenders often require.

5. Toronto-specific checks

• RentSafeTO record. Buildings with 3+ storeys and 10+ units must be registered. Evaluation scores are published by the City, and from June 15, 2026 buildings must display colour-coded signs near the main entrance. A low score signals deferred maintenance and more City attention. See our RentSafeTO guide.
• Property standards orders. Search for open orders against the property.
• Renovation licence history. If units were emptied using renovation notices, understand whether tenants have a right of first refusal to return.
• Energy and water reporting. Buildings of 50,000 sq ft and larger must report annually to the City and province. Ask for the Portfolio Manager data — it's a quick read on utility costs.

6. Contracts and staff

Many service contracts transfer with the building. Read each one: elevator maintenance, laundry, waste, fire protection, cleaning, pest control, telecom and cable access agreements. Note the term, renewal date and cancellation notice. If there's a live-in superintendent, review the employment terms and their occupancy arrangements — a superintendent's premises has special rules under the Residential Tenancies Act.

Red flags worth slowing down for

• Rents on the roll well above the rest of the building with no clear reason — they may be recent, unverified or include side deals.
• Many units marked vacant or “owner use” with no history.
• Several suites recently re-rented after N12 or N13 notices.
• Unlicensed basement or added units counted as income.
• A vendor who can't produce N1 copies, Fire Code records or the elevator contract.
• Utility bills climbing faster than prices — a sign of leaks, failing equipment or uncontrolled heating.
• A cluster of open LTB tenant applications about maintenance.

None of these is automatically a deal-breaker. Each is a reason to ask more questions and, sometimes, to adjust the price.

7. Financing

Apartment buildings of five or more units are usually financed with conventional commercial mortgages or CMHC-insured multi-unit mortgages. CMHC's MLI Select program offers more favourable terms — such as longer amortization and higher loan-to-value — in exchange for commitments on affordability, energy efficiency or accessibility. Each commitment has reporting obligations over time, so understand them before choosing it. Lenders will want the rent roll, operating statements, the condition assessment and an appraisal, so your due diligence package and your financing package overlap heavily.

8. The handover

1. Notify tenants. A written notice of the new owner, the new landlord's legal name and address for service, and where and how to pay rent from the first post-closing payment.
2. Transfer deposits. Last month's rent deposits and accrued interest, with a unit-by-unit list, adjusted on the statement of adjustments.
3. Get every record. Leases, tenant files, N1 history, Fire Code records, elevator logbook location, warranties, drawings, keys and fobs, access codes.
4. Utilities and insurance. Accounts transferred on closing day, and coverage bound before you own it.
5. Update registrations. TSSA licence ownership details, RentSafeTO registration and emergency contacts on the tenant notification board.
6. Walk the building with the new manager. Every suite, if possible, within the first few weeks — the photos become your baseline.

How we help buyers

We can review rent rolls and operating statements during due diligence, walk the building with your consultants, and have management, banking and tenant communications ready on closing day. See apartment building management, or talk to us about a building you're looking at.

This guide is general information, not legal, tax or financial advice. Work with your lawyer, lender and accountant on any purchase.