Real estate income
Multifamily Apartments
One building, many leases: an apartment property spreads rent across dozens of tenants so a single move-out dents income instead of stopping it.
Multifamily is residential rental property with multiple units, from a duplex to a several-hundred-unit apartment community. Income is the pooled rent from all units, less operating expenses and debt service, and the property's value is set by its net operating income divided by the market cap rate. Properties of five or more units are financed and valued as commercial real estate rather than as houses.
Rent and lease payments Semi-passive
The labels above place this income type before you read a word. The first is the mechanism — how the money actually reaches you, whether by lending it out, owning a slice of something, renting an asset, licensing a right, selling an option or owning a business somebody else runs. The second says whether the income keeps arriving on its own once it is running, or whether it needs work from you to keep coming. Both are descriptions of how the thing is built, not verdicts on it.
How it works
A two- to four-unit building is still underwritten like a house: the lender looks at the borrower's income, credit, and down payment, and the loan sits on residential paper. Cross the line to five units and the deal becomes commercial real estate. The loan is sized instead by the property's own cash flow, expressed as a debt service coverage ratio, and the borrower's personal income becomes almost irrelevant to the underwriting.
Leases typically run twelve months, but a well-run property staggers the expiration dates so only a slice of the rent roll turns over in any given month. This smooths income and avoids the scenario where a whole building's leases lapse at once. Rent is not the only income line: pet rent, reserved parking, storage units, laundry machines, and utility billback through RUBS or submeters all add to the collected total.
Value in this asset class is not comparable-sales driven the way a house is; it is derived from income. Net operating income divided by the market cap rate sets the appraised value, which means a rent increase or an expense cut raises the property's value directly and immediately, at least on paper.
Value-add investing exploits that link: renovate units as tenants turn over, push rents on the upgraded units, then refinance or sell against the higher income. It works when the renovation budget and timeline hold; when they do not, it is a construction project wearing a real estate costume. Agency debt from Fannie Mae and Freddie Mac multifamily programs is distinctive to the sector, often non-recourse to the sponsor and structured with an interest-only period.
What it pays
Multifamily returns are quoted in a few standard ways: a cap rate at purchase, a cash-on-cash return once debt service is subtracted, and, for institutional buyers modeling a multi-year hold, an internal rate of return that blends income and eventual sale proceeds. None of these numbers is a promise; all are assumptions about future rent, expenses, and financing cost.
Physical occupancy, the share of units with a tenant in them, is not the same as economic occupancy, the share of the rent roll actually collected. Concessions, bad debt, and units offline for repair all widen the gap, so a property can look full and still underperform its stated rent roll.
Rent growth is a local story before it is a national one. It tracks job growth and household formation in the immediate submarket, offset by how much new supply is under construction or leasing up nearby; a wave of new deliveries can flatten rent growth even where local employment is strong.
The operating expense ratio, expenses as a share of effective gross income, is the number brokers and lenders scrutinize hardest, because it is where sponsor assumptions are most easily too optimistic. Larger properties normally carry professional, on-site management as a standard line item, which is part of why the asset class sits closer to genuinely passive than a single rental house does.
Costs and taxes
Operating costs include on-site payroll, property tax, insurance, utilities, unit turnover, marketing, ongoing repairs, and a per-unit reserve set aside for capital items. These are recurring and unavoidable; they are subtracted from gross rent before anything reaches an owner or a limited partner.
Property tax reassessment after a sale is a common and frequently underestimated jump, particularly in states that reassess to purchase price rather than capping annual increases. A deal underwritten on the seller's old tax bill can look materially different once the new bill arrives.
For US tax purposes, residential rental property depreciates over 27.5 years. A cost segregation study can break out appliances, flooring, cabinets, and site improvements into shorter recovery periods, front-loading deductions in the early years of ownership. Depreciation recapture applies at sale, taxed at a rate distinct from ordinary capital gains.
Ownership is typically held in an LLC or LP, with income and losses passed through to investors on a K-1. Passive activity loss rules still apply at the individual level, limiting how much of that loss can offset other income. Insurance cost, especially in coastal and hail-exposed regions, has grown large enough in recent years to be a swing factor that determines whether a deal's numbers work at all.
Liquidity and time commitment
Selling a multifamily property is a brokered marketing process: a listing period, a due diligence window for buyers, lender approval of the new borrower, and sometimes negotiation over assuming the existing loan. The process runs months, not days, and a deal can fall apart at any stage before closing.
The real constraint on timing is debt maturity, not owner preference. A bridge loan or floating-rate loan coming due forces a sale or refinance on whatever schedule the lender set, regardless of whether market conditions favor the owner at that moment.
Direct ownership means hiring and supervising a property management company, approving annual budgets, and signing off on capital improvement plans; it is described as moderate effort because the manager, not the owner, handles day-to-day operations. Most individual investors reach this asset class not as direct owners but as limited partners in a syndication, contributing capital in exchange for a passive share of the cash flow and eventual sale proceeds.
Publicly traded apartment REITs offer an alternative path to the same underlying rent stream, with daily liquidity through the stock market and no operational control over any single property.
How it goes wrong
Floating-rate debt paired with a rate cap that later expires is a common failure pattern: financing cost jumps, the debt service coverage ratio breaks its covenant, and the lender can take control of the property's cash flow through a cash management agreement or force a sale.
New supply delivering into a submarket pushes owners toward concessions, free months of rent offered to sign a lease, which erode economic occupancy well before they show up in the advertised asking rent. A property can appear to hold its rental rate while actually collecting less.
Value-add plans assume every unit renovates on schedule and re-leases at the projected rent premium. Contractors run late, material costs rise, and renter demand for the upgraded product does not always match the underwriting; the gap between plan and execution is where many syndicated deals lose money.
Bad debt and tenant skips rise when the local economy weakens, and how long a non-paying unit stays non-paying depends heavily on state and local eviction timelines and moratoria. Deferred maintenance discovered only after closing, aging plumbing stacks, a roof near the end of its life, a cracked parking lot, can consume the capital reserve meant for distributions before a single dollar reaches investors.
What to remember
- Rent is pooled across many units, so one vacancy dents income rather than stopping it, but a whole submarket's new supply can dent it for everyone at once.
- Value is set by net operating income divided by cap rate, so raising rent or cutting expenses raises appraised value directly, and the reverse is equally true.
- Five or more units means commercial underwriting: the loan is sized by the property's debt service coverage ratio, not the owner's paycheck.
- Depreciation over 27.5 years, with cost segregation available, is a real tax benefit, but it is recaptured at sale and passive loss rules limit its use against other income.
- Debt maturity, not investor preference, usually decides when a sale or refinance has to happen.
- Value-add strategies are underwriting a renovation and lease-up plan as much as a building; execution risk is the plan not matching the contractor's schedule or the market's rent tolerance.
This page explains how the income type works, which does not change from week to week, so it deliberately carries no rate and no price. The links below go to the pages that hold the current figures for it, each one stamped with the date the data was pulled. Read the mechanism here first: the numbers there are far easier to judge once you know what they are measuring.
See the live numbers: Commercial Real Estate.
Frequently asked
Why are five or more units treated differently from a duplex?
What is a value-add apartment deal?
What is the difference between physical and economic occupancy?
Is owning an apartment building passive?
Written for information only. Nothing here is investment, tax or legal advice, and no page on this site recommends buying or selling anything. Rules and tax treatment change; verify anything that matters with a professional who knows your situation. This explainer was drafted by a language model (claude-sonnet-5) from an editor-approved outline and fact sheet, under the rules set out in our editorial policy, and carries no market figures. Last updated Jul 29, 2026.