Real estate income
Office Buildings
Space leased to employers under multi-year contracts, where the rent is stable until the lease ends and then everything depends on whether the tenant still needs the desks.
Office property is workspace leased to businesses and professional firms, usually on leases of several years with annual escalations and an expense stop or base year. Income is contractual and predictable within the lease term, but the capital required to re-lease space — improvements, commissions and free rent — is unusually heavy. The sector has been reshaped by hybrid work, with wide divergence between newer amenitized buildings and older commodity space.
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
An office lease is typically quoted per rentable square foot per year, and rentable area exceeds the space a tenant can actually put desks in — the load factor adds a share of lobbies, corridors, elevator banks and restrooms to every suite. Terms usually run several years, giving both sides a fixed structure to plan around rather than a month-to-month arrangement.
Most leases are full-service gross: the landlord covers operating costs up to an agreed base year or expense stop, and the tenant absorbs its pro rata share of increases above that level for the rest of the term. This shifts inflation risk on operating costs to the tenant after year one, while the landlord still manages the building day to day.
Getting a tenant into the space costs money before any rent is collected. A tenant improvement allowance pays for the buildout of the suite, amortized by the landlord against the rent stream, and free rent at the start of the term is standard practice — both mean the effective rent collected is well below the face rent printed in the lease.
The lease document itself carries options — renewal rights, expansion rights, rights of first refusal, early termination clauses — that determine how much control the landlord actually retains over the space and the timing of any re-leasing. Buildings are also sorted informally into Class A, B and C, a shorthand for age, location, systems and amenities that increasingly predicts whether a building leases at all.
What it pays
In-place income is quoted as a cap rate on net operating income, but that figure describes what is being collected today, not what a new tenant would actually cost to sign. Buyers underwrite net effective rent — face rent minus amortized improvements and commissions — because that is the number that determines cash return after rollover.
Weighted average lease term and tenant credit quality set how bond-like the income feels. A long lease to an investment-grade or government tenant prices closer to a fixed-income instrument; a short lease to an early-stage company carries equity-like uncertainty even though the contract looks similar on paper.
Escalations inside the lease are usually fixed annual bumps agreed at signing, not resets to market rent, so income growth during the term is contractual and modest. Parking can be a meaningful separate income line in urban buildings, priced and leased apart from office space itself.
The single largest swing factor is mark-to-market — the gap between the rent currently being paid and what the same space would command today. That gap can run positive, cushioning income at renewal, or deeply negative, meaning the day a lease rolls, income falls even before accounting for the capital needed to re-lease.
Costs and taxes
Running the building costs property tax, insurance, utilities, cleaning, engineering staff, elevator and HVAC servicing, and security — costs that recur whether or not the space is leased. Under a gross lease structure much of this is passed through above the base year, but the landlord fronts it and manages the vendors.
The defining cost of the business is leasing capital: improvement allowances and commissions to both the tenant's broker and the landlord's broker, paid up front against rent collected over years. A large vacancy can require capital outlays that take most of the lease term to earn back.
For US tax purposes, the building depreciates over 39 years as non-residential real property, while interior improvements often qualify for shorter-lived treatment as qualified improvement property, accelerating deductions. Rental income is taxed as ordinary income, depreciation is recaptured on sale, and gain can be deferred through a 1031 exchange into another qualifying property.
Beyond routine upkeep, repositioning capital — a new lobby, elevator modernization, an amenity floor, HVAC replacement — is treated as capital expenditure rather than expense, and is increasingly required just to remain competitive for tenants. A growing number of cities layer on energy performance and emissions ordinances that impose retrofit mandates and penalties on buildings that do not comply.
Liquidity and time commitment
Selling an office building is a long process even in normal markets, and in weak periods the gap between what sellers want and what buyers will pay can stall transactions across an entire sector for years, not months. There is often no market-clearing price to observe, only asking prices and deals that do not happen.
Financing has been the tightest of the major property types in recent cycles, with lenders scrutinizing lease rollover schedules closely before extending or refinancing debt. A building with a large lease expiration in the near term is harder to finance regardless of its current occupancy.
Ownership is active work: leasing strategy, capital planning, negotiating the economics of each deal, and ongoing lender reporting and covenant compliance. Lease expirations are planned years in advance because a large rollover requires capital reserved well before the tenant actually leaves.
Public office REITs offer daily liquidity on essentially the same underlying rent stream, at the cost of equity market volatility that can diverge sharply from the value of the underlying real estate in the short run.
How it goes wrong
The most common failure is straightforward: a major tenant does not renew, and the space sits vacant for many months while a new deal is negotiated, an improvement allowance is funded, and commissions are paid — all before a dollar of new rent arrives. Hybrid work compounds this, as even growing companies now often renew for less square footage than they occupied before.
Vacant space also competes with sublease space that departing or downsizing tenants list directly against the landlord's own availability, usually at a discount, pulling market rents down further. Tenant credit can deteriorate mid-term as well — a lease is only as reliable as the entity that signed it and any guarantee standing behind that signature.
Older commodity buildings face a harder version of this problem: the capital required to make them competitive exceeds what the resulting rent can ever repay, leaving them functionally unleasable without a change of use such as conversion to another purpose.
When enough of this compounds, the building's value falls below the outstanding mortgage balance. At that point the owner faces a decision between funding a refinancing gap out of pocket or handing the keys to the lender, and lenders' own scrutiny of these outcomes has made new financing scarce across the sector.
What to remember
- Office rent is contractual and stable within a lease term, but the capital required to re-lease space at rollover is unusually heavy and often exceeds years of the rent it produces.
- Face rent overstates real income; net effective rent after improvement allowances, commissions and free rent is the number that matters.
- Cap rates and lease terms describe in-place income, but mark-to-market — the gap to current market rent — determines what happens the day a lease expires.
- Hybrid work has structurally reduced space demand per employee and widened the gap between amenitized Class A buildings and older commodity space.
- Financing for office has been unusually scarce, and value falling below debt is a live risk that can force a choice between funding a gap or losing the asset to the lender.
- Direct ownership requires active asset management and seven-figure-plus capital; REITs offer fractional, liquid exposure to the same underlying rent stream.
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
What is net effective rent?
What is a base year or expense stop?
Why is office considered riskier than other commercial property?
What does the load factor mean on an office lease?
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.