Definition
Multifamily refers to a residential property with two or more dwelling units under one ownership structure. Multifamily ranges from small properties (duplexes and fourplexes) to large apartment communities with hundreds of units.
Common Multifamily Property Types
- Small multifamily: 2–4 units (often financed like residential in some cases).
- Mid-size apartments: 5–50+ units (usually commercial financing and professional management).
- Large communities: 100+ units with on-site staff and more amenities.
- Garden-style: low-rise buildings, typically spread across multiple structures.
- Mid-rise / high-rise: elevator buildings, more common in dense urban cores.
Why Investors Like Multifamily
Multifamily is often viewed as a durable property type because demand for housing is persistent and vacancy risk is diversified across many units (one move-out doesn’t zero the income stream).
- Multiple income streams: rent comes from many tenants rather than one.
- Operational upside: revenue and expenses can be improved through management.
- Scalability: professional systems can be applied across many units.
- Liquidity: institutional and private buyers actively trade multifamily in many markets.
Key Underwriting Drivers
- Net Operating Income (NOI): rent and other income minus operating expenses.
- Occupancy and loss-to-lease: how full the property is and where rents sit versus market.
- Rent growth & renewals: ability to push rents through turnover and renewals.
- Expense load: payroll, repairs, utilities, taxes, insurance, and management costs.
- Capital needs: unit turns, renovations, deferred maintenance, roofs, plumbing, parking, etc.
- Debt terms: interest rate, amortization, maturity, covenants, and reserves.
Multifamily Revenue Sources
Multifamily income is more than just base rent. Strong operators treat ancillary income as a real operating lever (without harming retention).
- Base rent (primary)
- Utility reimbursements and bill-backs (RUBS, submetering, or flat fees)
- Parking (reserved, covered, garages)
- Pet rent and fees
- Storage and garages
- Application/admin fees
- Other: laundry, vending, smart-home packages, furnished units (market-dependent)
Common Risks
- Rent control & regulation: limits on rent increases, fees, or eviction processes.
- Supply pressure: new deliveries can force concessions and slow rent growth.
- Expense volatility: taxes, insurance, and utilities can move faster than rents.
- Capex surprises: hidden deferred maintenance can destroy projected returns.
- Bad debt/collections: tenant screening and local economics matter.
Example
Two 40-unit properties can have the same occupancy but very different performance:
- Property A has below-market rents, high utility waste, and weak collections—creating room for NOI growth.
- Property B is already at market rent but has rising taxes and insurance—meaning returns depend on expense control.
In both cases, the investment outcome is driven by NOI durability and the operator’s ability to manage revenue, expenses, and capex—not just headline occupancy.
Common Pitfalls
- Assuming “market rent†is achievable: unit condition, comps, and tenant profile determine reality.
- Underestimating capex: renovations and deferred maintenance often cost more than expected.
- Ignoring operational constraints: staffing, vendor capacity, and turn time control lease-up and renewal outcomes.
- Overpaying on pro forma: betting on rent growth and cap rate compression instead of controllable NOI gains.