Signing your first commercial office lease is one of the most significant financial commitments your business will make. Most first-time tenants approach this transaction the way they approach renting an apartment: focused on the monthly rent number, moving quickly to get the space they want, and trusting that the paperwork is more or less standard. It is not.
Commercial leases are drafted by landlord attorneys and optimized for the landlord’s interests. Every provision that is left vague, every right that is not explicitly granted and every deadline that is not calendared works in the landlord’s favor by default. This guide walks through the five steps of leasing your first office, from understanding what you’re actually signing to knowing which terms to lock down in the LOI before you commit, so you go into the process with a clear picture of what you’re agreeing to and what to ask for.
Step 1: Understand the Different Types of Office Leases
The first thing to understand about leasing office space is that the monthly rent quoted to you is not necessarily your total monthly cost. The relationship between quoted rent and actual occupancy cost depends on the type of lease structure, and getting this wrong is one of the most common and expensive mistakes first-time tenants make when comparing spaces. There are four main types of office leases, each with a different relationship between the quoted rent and your total cost:
| Lease Type | Your Monthly Rent Covers | You Pay Separately | Most Common In |
| Full-Service Gross (FSG) | Base rent + all operating expenses: taxes, insurance, utilities, janitorial, maintenance. One predictable monthly number | Expenses above the “base year” expense stop if your lease has one; any above-standard utility use beyond what’s included | Class A and B office buildings in major urban markets; the most common structure for first-time office tenants |
| Modified Gross | Base rent + some (but not all) operating expenses. The split is negotiated and varies by lease | Whatever expenses the lease specifies are the tenant’s responsibility. Often utilities, sometimes janitorial or a proportionate share of taxes | Mid-market office buildings; some medical and professional office space; careful lease review required to understand exactly what’s included |
| Triple Net (NNN) | Base rent only. The quoted rent is the floor, not the ceiling | Property taxes, building insurance, common area maintenance (CAM), utilities and janitorial, all passed through directly to tenant | Retail, industrial and single-tenant buildings; less common for multi-tenant office; total occupancy cost is base rent plus 20–40% or more |
| Industrial Gross | Base rent + some utilities and basic maintenance; structure varies by landlord | Janitorial, specialty utilities (high power, water) and often a portion of CAM | Flex, R&D and light industrial space; common when a business needs both office and warehouse or production square footage |
Most first-time office tenants will encounter a full-service gross (FSG) lease structure, which is the most straightforward for budget planning. Your monthly rent covers base rent plus operating expenses up to the expense stop. The important caveat: FSG leases typically include an expense stop, set at the landlord’s actual operating expenses in the base year, and any increase in operating expenses above that stop gets passed through to you on a pro-rata basis. In a year with a significant property tax reassessment or major insurance increase, this can add meaningful cost above your quoted rent.
Before signing any lease, have a tenant advisor model your total occupancy cost, not just the quoted rent, so you’re comparing spaces on an apples-to-apples basis. Two spaces at the same quoted rent per square foot can have very different actual costs depending on lease structure, expense stop and the building’s historical operating cost track record.
Step 2: Complete a Needs Assessment
The single most effective way to avoid overpaying for office space is to know what you actually need before you walk into a single space. Most first-time tenants approach the search with a rough headcount and a vague sense of what feels right. Landlords and their brokers are skilled at showing you spaces that feel just large enough to justify the asking rent, and at nudging you toward more square footage than you need.
How Much Space Do You Need?
Check out our Office Space Calculator to help you plan your future workspace. But keep in mind, it isn’t only about the square footage. There are many factors that go into determining what is right for your company now and looking ahead. Here is our resource on Needs Assessments and why they are a valuable step in the process.
Understand Usable vs. Rentable Square Footage
Office space is quoted in rentable square feet (RSF), which includes your usable square feet (the space you actually occupy) plus your proportionate share of common areas: lobbies, hallways, restrooms and mechanical spaces. The percentage by which RSF exceeds usable SF is called the load factor or add-on factor, and it typically ranges from 10% to 25% in multi-tenant office buildings. A space quoted at 3,000 RSF with a 20% load factor gives you approximately 2,500 usable square feet. Higher load factors mean less actual usable space per dollar of rent.
Building Class
Class A buildings command premium rents and typically offer the best amenities, building systems and location quality. Class B buildings offer a middle ground, often well-maintained, slightly older or less amenity-rich, with lower rents. Class C buildings are the most value-oriented but require careful evaluation of building systems, maintenance standards and the quality of ownership. For a first lease, be honest about what your business needs vs. what impresses, as clients generally care less about building prestige than founders do.
Lease Term
Landlords generally prefer 5- to 10-year terms for office space. Shorter terms are available but typically come with less favorable economics: lower TI allowance, less free rent, higher per-SF rent. First-time tenants should think carefully about a term that balances the economic benefit of a longer commitment against the flexibility risk of locking in for a period longer than their business visibility.
Parking & Location
Define your parking requirement (spaces per 1,000 SF leased is the standard metric) and your location criteria before starting the search. These are significantly harder to negotiate after you’ve fallen in love with a space than before you’ve seen anything. Note that parking charges are in addition to rent – and very rarely included.
Step 3: Work With a Tenant Rep Broker at No Cost to You
One of the most persistent misconceptions among first-time commercial tenants is that working with a tenant representative broker will cost them money. It will not. The landlord pays both brokers, the landlord’s broker and the tenant’s broker, out of a leasing commission that is built into the economics of every deal. If you do not bring your own broker, the landlord’s broker typically collects the full commission. You do not save money by going unrepresented; you simply allow the landlord’s representative to collect both sides of the commission while representing the landlord’s interests.
What does a tenant rep actually do? They identify every available space that meets your criteria (including spaces that are not publicly listed), negotiate economic terms using current market data on comparable transactions, review the LOI and lease for provisions that require modification, coordinate the build-out process and advocate for your interests at every point in the transaction. An experienced tenant representation broker knows the actual rents landlords are accepting, not just the asking rents they’re posting, and what concessions the market supports. In a first office lease, that market intelligence is worth far more than the fee you’re not paying.
One specific risk to understand: the landlord’s listing broker is legally obligated to represent the landlord’s interests, not yours. In states that allow dual agency, where the same broker represents both parties, this conflict is disclosed on paper, but the practical dynamic remains: the broker’s relationship and repeat business come from the landlord, not from a first-time tenant they will likely never transact with again. The incentive structure matters. A dedicated tenant representative has no landlord relationships to protect and no reason to steer you toward a deal that benefits the landlord over you.
Step 4: Evaluate Spaces and Understand the Full Cost Stack
When you tour spaces and receive proposals, the quoted rent per square foot per year is only the beginning of what you need to understand about each option’s total cost. First-time tenants often make location decisions based on the headline number, then discover the full economics later, sometimes at lease signing, sometimes not until the first annual operating expense reconciliation arrives.
Tenant Improvement Allowance (TI)
Almost all office leases include a TI allowance, the landlord’s contribution toward building out the space to your specifications. In today’s market, TI allowances in Class A and B office buildings typically range from $50 to $150 per rentable square foot, depending on market, building quality, lease term and your credit profile. A space with a higher quoted rent but a generous TI allowance may cost less in net-present-value terms than a lower-rent space with no allowance because you’re paying the build-out cost in one case and the landlord is in the other. Always model TI against total cost, not separately.
Free Rent
Free rent, months during which you occupy the space but pay no base rent, is a standard negotiating concession in virtually every commercial office market today. Typical free rent ranges from 1 to 2 months on a 3-year lease to 4 to 8 months on a 5- to 7-year lease, depending on market conditions. First-time tenants frequently leave this on the table by not knowing to ask. A tenant representative negotiates free rent as a standard component of the transaction, not an exceptional request.
Operating Expense Pass-Throughs
As noted in the lease type section, operating expenses above the base year stop get passed through to tenants in FSG leases. Before signing, request the building’s historical operating expense data for the past 3 years and have your advisor assess the typical year-over-year increase. A building with a history of large annual reconciliation billings is a real cost factor that doesn’t appear in the quoted rent.
Step 5: Negotiate the LOI Before You Agree to Anything
The letter of intent is the document that establishes the agreed business terms before the formal lease is drafted. It is the most important document in the lease process for a first-time tenant, because every term that is left out of the LOI will be filled in by the landlord’s attorney in the landlord’s preferred language. Once the LOI is signed and the lease drafting begins, your ability to introduce new provisions or reverse unfavorable terms is significantly diminished. The landlord’s team will defend every provision in their draft as “standard” or “consistent with what was agreed.”
At minimum, the LOI should specify: base rent (by year, with escalation rate defined), lease term, tenant improvement allowance (amount, delivery method and timeline), free rent (number of months and scope), renewal option (number of options, notice period and rent determination process), personal guarantee limits, permitted use definition, parking commitment, signage rights and, if applicable, an early termination option. Everything that matters to you as a tenant should appear in the LOI before you sign it. A tenant advisor will draft or review the LOI and ensure these provisions are present, specific and protective before you commit.
The LOI is also where your leverage is highest. The landlord is motivated to close the deal, and you still have competing options in play and the freedom to walk away at no cost. That motivation window closes once the LOI is signed. Use it.
Frequently Asked Questions
The typical timeline from starting a search to executing a lease is 3 to 6 months for a straightforward first office lease in a mid-market location. The major phases: 2 to 4 weeks of space identification and touring, 2 to 4 weeks of LOI negotiation, 2 to 4 weeks for the landlord’s attorney to draft the lease, and 2 to 6 weeks of lease review and negotiation. Add time for the build-out: light tenant improvement work typically takes 4 to 8 weeks after lease execution; significant build-outs can take 3 to 6 months or longer. Start early enough that your current workspace can accommodate your team through the entire process. The single biggest mistake in first lease timing is underestimating how long the process takes and negotiating under deadline pressure.
The four main types of office leases are: full-service gross (FSG), where your monthly rent covers all operating expenses including taxes, insurance, utilities and janitorial; modified gross, where rent covers some but not all operating expenses with the specific split defined in the lease; triple net (NNN), where you pay base rent plus all operating expenses (taxes, insurance and maintenance) separately; and industrial gross, a hybrid structure common in flex and R&D space. Most first-time office tenants will encounter full-service gross leases in Class A and B office buildings, which offer the most predictable monthly cost. The key to comparing leases across different structures is modeling total occupancy cost, not just quoted rent per square foot, for each option you’re considering.
Budget for several categories beyond monthly rent. One-time costs at move-in: build-out costs above the TI allowance (request a space plan and budget estimate before committing), moving costs, furniture and technology infrastructure, and security deposit (typically 1 to 3 months of base rent and often due upon lease signing). Recurring costs above the quoted rent: operating expense pass-throughs if the lease is NNN or modified gross (or increases above the expense stop in an FSG lease), parking charges if not included, and above-standard utility use. Contingency: first-time tenants should budget 15 to 20% above their base rent estimate for unexpected costs in the first 12 months: HVAC issues, maintenance items not resolved by the landlord, technology infrastructure costs and operating expense reconciliation charges. A tenant advisor can walk you through a detailed occupancy cost projection for any space you’re seriously considering before you sign.
Shorter is often better. For most first-time office tenants, a 3-year lease is the minimum term that will generate meaningful landlord concessions (TI allowance, free rent) while limiting exposure in a scenario where the business changes. A 5-year term typically produces significantly better economics (more TI, more free rent, lower per-SF rent), but commits you to a longer period of fixed overhead. The right answer depends on your business’s runway visibility, growth trajectory and whether you can negotiate a meaningful early termination option into the lease. A 5-year lease with a well-structured termination option at year 3 can give you better economics than a 3-year lease while preserving flexibility, if your tenant advisor negotiates the termination fee correctly. Avoid letting the landlord push you toward a 7- or 10-year term on a first lease without a clearly defined termination option.
The most common and costly mistake is focusing almost entirely on the quoted monthly rent and moving too quickly through the LOI and lease review process. First-time tenants frequently: accept the landlord’s LOI without reviewing it carefully or adding missing tenant protections; sign leases without understanding the personal guarantee exposure; skip negotiating a renewal option or termination option because it feels premature; and accept “standard” lease language on CAM reconciliation, holdover rent and sublease restrictions without knowing these are negotiable. The underlying cause of most of these mistakes is not having experienced tenant representation. A landlord’s broker will not tell you which provisions are negotiable or which ones are most likely to hurt you. Their obligation is to the landlord. An experienced tenant representative catches these issues before the lease is signed, when they can still be fixed.
