How to Buy Multifamily Property: A Commercial Buyer’s Guide
By PropZone Research · Updated June 8, 2026
Multifamily is favored for its steady demand and operational granularity — many small leases instead of a few large ones. Returns come from buying at a sensible basis, operating efficiently, and growing rents to market. This guide covers how to evaluate an apartment or multifamily listing.
Unit mix, rents, and loss-to-lease
Review the rent roll for unit mix, in-place rents versus market rents (the gap is your loss-to-lease and a primary source of upside), lease expirations, concessions, and delinquency. A property with rents well below market may offer value-add upside — but confirm the local market actually supports the higher rents.
Physical and economic occupancy can differ; a unit can be occupied but not paying. Underwrite economic occupancy and a realistic stabilized vacancy.
Operating expenses and the expense ratio
Multifamily has more operating line items than other asset classes — payroll, repairs and maintenance, turnover, utilities, taxes, insurance, and management. Compare the property’s expense ratio (operating expenses as a percentage of effective gross income) to local norms; an unusually low ratio often signals deferred maintenance or under-reported costs.
Property taxes frequently reset on sale — underwrite the reassessed taxes, not the seller’s current bill.
Condition, regulation, and management
Inspect roofs, mechanicals, plumbing, and unit interiors, and budget realistic turnover and capital costs. Confirm any rent-control or rent-stabilization rules, local tenant-protection ordinances, and code requirements, which vary significantly by jurisdiction and can constrain rent growth.
Operations drive multifamily returns; weigh whether you will self-manage or hire professional management, and price that cost in.
Key metrics to know
- Cap rate
- Net operating income divided by purchase price. A higher cap rate generally signals more income per dollar invested (and often more risk); a lower cap rate signals a more stable, in-demand asset.
- Net operating income (NOI)
- Annual rental and other income minus operating expenses (taxes, insurance, maintenance, management), before debt service and capital expenditures.
- Price per square foot
- Purchase price divided by building (or rentable) square footage — the quickest way to compare a listing against local comparables.
- Loss-to-lease
- The gap between in-place rents and current market rents — a key indicator of value-add upside when the market supports higher rents.
- Operating expense ratio
- Operating expenses as a percentage of effective gross income; an outlier-low ratio can signal deferred maintenance or under-reported costs.
Due-diligence checklist
- Rent roll, trailing operating statements, and a unit-by-unit lease audit
- Reassessed property-tax estimate (taxes often reset on sale)
- Interior and exterior condition inspection with a capital plan
- Rent-control / stabilization and local tenant-ordinance review
- Utility billing and any RUBS/submetering arrangements
- Title, survey, zoning, and certificate-of-occupancy review
Frequently asked questions
- How do I evaluate a multifamily investment?
- Audit the rent roll and operating statements, compare in-place rents to market (loss-to-lease), normalize expenses including reassessed property taxes, and apply a cap rate from comparable local sales. Confirm any rent-control rules and budget realistic capital and turnover costs.
- Why do property taxes matter so much in multifamily underwriting?
- In many jurisdictions property taxes are reassessed when a property sells, so the buyer’s tax bill can be materially higher than the seller’s. Underwriting the seller’s current taxes overstates NOI and value — always model the reassessed amount.
- What is loss-to-lease?
- The difference between what tenants currently pay and current market rents. A large loss-to-lease can represent upside as leases roll to market — provided the local market genuinely supports the higher rents.