A lease shows up as a PDF, it's a dozen pages of dense type, and you've already mentally moved into the apartment or the storefront. So you scroll to the bottom, sign, and send it back. I understand the impulse. But here's the question I end up asking people after a dispute lands in my office: what lease did you actually sign? More often than not, they're not sure.
A lease is a binding contract. Whether it's the apartment your kid is renting at college or a five-year deal on commercial space for your business, the words in that document control what happens for years. Let me show you why it's worth reading, and the clauses that tend to cause the most trouble.
"I figured it was standard" is where it goes wrong
The most common mistake I see isn't signing a bad lease on purpose. It's assuming the lease is "standard" and signing it without reading. There's no such thing as a standard lease. Landlords draft leases to protect landlords, and the terms vary enormously from one to the next. The clause that costs you money is almost always one you could have caught by simply reading and asking a question before you signed.
Once you've signed, your leverage is mostly gone. The time to negotiate is before your signature, when the other side still wants the deal. After, you're living with whatever you agreed to.
The clauses that bite
A few provisions deserve special attention, because they're where people get surprised.
Personal guarantees
This one is huge, especially in commercial leases. A personal guarantee means that even if your business signs the lease, you're personally on the hook if the business can't pay. So if the company folds, the landlord can come after your house and your savings. Many tenants don't even realize they signed one. If a guarantee is in there, you want to know it, understand its scope, and try to limit it, a cap on the amount, or a sunset after a certain period.
Renewal and rent escalation
How does the lease end, and how does it renew? Some leases auto-renew unless you give notice far in advance, so you can get locked into another year by accident. And watch the escalation clause, the formula for how rent goes up over the term. A number that looks fine in year one can climb in a hurry, particularly in a longer commercial lease.
Assignment and subletting
Life changes. The business outgrows the space, or you need to move. Can you assign the lease or sublet to someone else? Many leases restrict this or require the landlord's consent. If you might need flexibility, this clause matters a lot, and it's far easier to negotiate up front than to beg for permission later.
Default and what triggers it
What counts as a default, and what happens when one occurs? Look at the cure period, the window you get to fix a problem before the landlord can act, and at the remedies the landlord can pursue. Some leases let a landlord accelerate the entire balance or pile on fees. You want to know how forgiving, or unforgiving, the document is before you're the one who's late.
Commercial leases raise the stakes
Residential leases deserve a careful read, but commercial leases are a different animal. They're longer, more heavily negotiated, and the consequences are bigger. Terms about who pays for taxes, insurance, and maintenance, who's responsible for repairs and build-out, and how the space can be used can make or break the economics of your business. Signing a commercial lease without understanding it is one of the riskier things a business owner can do.
Get it reviewed before you sign, not after
Here's my honest advice: have someone review the lease before you sign, particularly for a commercial space or any lease with a personal guarantee or a long term. A review before signing is quick and inexpensive. Cleaning up a dispute after the fact is neither.
A good review tells you what you're really agreeing to, flags the clauses that could hurt you, and gives you the points worth pushing back on while you still have leverage. Sometimes the lease is fine and you sign with confidence. Sometimes a single clause changes the whole deal. Either way, you'll actually know what lease you signed.
If you've got a lease in front of you, residential or commercial, I'm glad to take a look before you commit. You can learn more on our Real Estate page, and if you're on the landlord side or facing a tenant dispute, our Landlord–Tenant page covers that ground.
Don't let the answer to "what lease did you sign?" be a shrug. Read it, understand it, and sign it knowing exactly what you agreed to.