If you are a commercial tenant in Pennsylvania and you default under the lease agreement, you might assume the landlord has to try to find a replacement tenant for the space rather than do nothing and continue to collect from the tenant. That is the framework in most states. It is not the requirement in Pennsylvania.

Pennsylvania does not currently impose a duty on commercial landlords to mitigate damages when a tenant is in default under the lease. The landlord can let the space sit empty and sue the tenant for every month of unpaid rent through the end of the term. This represents a misunderstood exposure.

In this article I will explain the current rule as it relates to commercial leases, why it matters for tenants, and why landlords often have practical reasons to act as if the rule did not apply.

To be clear, there are different rules with respect to residential leases in Pennsylvania.

What “Duty to Mitigate” Means

In most contract disputes, the party that is wronged has a legal obligation to take reasonable steps to limit its losses. If a buyer breaches a contract to purchase 100 widgets, the seller cannot simply leave them in the warehouse and sue for the full price. The seller in most scenarios must make reasonable efforts to resell the widgets. That is the duty to mitigate damages.

Most states apply this contract law principle to commercial property leases. If a tenant breaches and abandons the premises, the landlord is expected to make reasonable efforts to re-let the space. If the landlord finds a replacement tenant, the original tenant’s liability is reduced by the new rent received. If the landlord makes reasonable efforts but cannot find a replacement, the tenant remains liable.

Pennsylvania has not adopted that explicit rule for commercial leases. The Pennsylvania Supreme Court has held that a commercial landlord whose tenant defaults under the lease agreement has no obligation to seek a replacement tenant. The landlord can leave the space vacant and pursue the tenant for the full rent owed under the lease, plus any other damages the lease allows.

Why the Rule Exists

The reasoning behind the Pennsylvania rule is that a commercial lease is not just a contract for services. It is a conveyance of an interest in real property for a defined term. When the tenant signs the lease, the tenant has bargained for the right to occupy the premises for that term. The landlord has bargained for the rent stream. From that perspective, requiring the landlord to take affirmative steps to undo the deal puts a burden on the landlord that the lease itself did not impose.

What This Means for Tenants

For a commercial tenant, the practical exposure is significant. Suppose you sign a five-year lease at $5,000 per month and your business fails after year two. You vacate the premises and stop paying rent. Under Pennsylvania’s default rule, absent language in the lease to the contrary, the landlord can leave the space empty for the remaining three years and sue you for $180,000 in unpaid rent, plus late fees, interest, and possibly attorneys’ fees if the lease provides for them. The landlord has no obligation to advertise the space, show it to prospects, or accept a replacement tenant who walks in the door.

That is the worst-case scenario, and it is the scenario the lease itself permits unless you negotiate otherwise. A tenant who understands the rule before signing has options. A tenant who learns about it after the business closes does not.

What Tenants Should Negotiate

If you are a commercial tenant in Pennsylvania, the following provisions are worth negotiating into the lease. Not every landlord will agree to all of them, but in a balanced market many of them are achievable.

• An express landlord obligation to use commercially reasonable efforts to re-let the premises in the event of tenant default, with the tenant’s liability reduced by rent received from any replacement tenant
• A defined acceleration cap that limits the landlord’s recovery to a specific number of months of rent rather than the full balance of the term
• A right to assign the lease or sublet the premises with the landlord’s consent, with consent not to be unreasonably withheld, conditioned, or delayed
• A buyout or termination right that allows the tenant to exit the lease for a defined fee under specified conditions, such as business closure or relocation
• A clear definition of what triggers default and what cure periods apply, so a missed payment or technical breach does not immediately accelerate the entire term

What This Means for Landlords

The default rule is favorable to landlords on paper. In practice, most landlords do not actually want to leave space empty and litigate. Vacant commercial space generates no income, accumulates carrying costs, and tends to attract problems that occupied space does not, including vandalism, deferred maintenance, and reduced property value. Pursuing a former tenant for years of rent is also expensive and uncertain. Tenants that walk away from leases frequently lack the resources to pay a large judgment, and even successful litigation often produces a paper victory rather than a real recovery of dollars.

Most experienced landlords act as if a duty to mitigate exists, even though it does not. They re-list the space, show it to prospects, and accept reasonable replacement tenants. The Pennsylvania rule gives them flexibility on the timing and terms of that effort, not a license to ignore the market.

Why Landlords Often Address Mitigation in the Lease

Some landlords may not negotiate the damages clause because landlords are often unwilling to limit their rights when tenants default.  That said, if a landlord is willing to negotiate, addressing mitigation expressly in the lease has some benefits.

• It can define the scope of the landlord’s effort, which prevents disputes later about whether the landlord did enough.
• It allows the landlord to set reasonable terms for what they believe is a suitable replacement tenant, including creditworthiness, use restrictions, and lease structure.
• It can make clear that the landlord will still recover the difference between the original rent and any lower replacement rent, including reasonable costs of re-letting such as broker commissions and tenant improvements.
• It is often a meaningful concession to offer in lease negotiations without giving up much economic value, if the landlord would mitigate anyway.

A landlord who is going to re-let the space regardless gives up little by saying so in the lease. A landlord who refuses to address mitigation in writing sometimes signals to a sophisticated tenant that the negotiation is going to be harder than it needs to be.

Final Thought – The Practical Middle Ground

In most well-negotiated Pennsylvania commercial leases, the parties land on a middle ground. The lease acknowledges that the landlord will make commercially reasonable efforts to re-let after a tenant default but defines what those efforts look like and what costs the landlord can recover. The tenant gets meaningful protection against open-ended liability. The landlord retains control over the re-letting process and the right to recover its actual losses, including the cost of finding the replacement tenant. This kind of provision is not difficult to draft, but it requires both parties to understand the default rule.

If you are negotiating a Pennsylvania commercial lease, whether as landlord or tenant, I am happy to talk through how these issues might apply to your specific situation.

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