Commercial property insurance protects the buildings, equipment, inventory, and income of a business. It is built differently from personal lines: instead of one packaged form, commercial property is assembled from modular pieces that snap together into a larger commercial package policy. This guide explains the core building block — the Building and Personal Property (BPP) form — along with the causes-of-loss forms, coinsurance, business income and extra expense, the common policy conditions, and the package concept that ties it all together.

How a commercial property policy is built

A commercial property policy is modular. The insurer combines several documents to create a complete contract:

• Common Policy Declarations — the who/what/where/how-much page.
• Common Policy Conditions — rules that apply to the whole policy.
• Commercial Property Conditions — conditions specific to property coverage.
• A coverage form (such as the Building and Personal Property form).
• A causes-of-loss form (basic, broad, or special) that defines what perils apply.

This modular design lets an insured add other lines (general liability, crime, inland marine, etc.) to the same policy. Two or more coverage parts combined create a commercial package policy (CPP).

The Building and Personal Property (BPP) form

The Building and Personal Property Coverage Form is the workhorse of commercial property. It provides three main categories of coverage, chosen on the declarations page:

• Building — the structure, completed additions, permanently installed fixtures and equipment, and outdoor fixtures. It also includes maintenance/service equipment and some materials used to maintain the building.
• Your Business Personal Property (BPP) — the insured's contents used in the business: furniture, machinery, equipment, stock/inventory, and "tenant's improvements and betterments" the insured made to a leased space.
• Personal Property of Others — property belonging to others that is in the insured's care, custody, or control.

The insured selects limits for each category. Loss settlement is usually actual cash value, but replacement cost can be elected on the declarations.

The causes-of-loss forms

The BPP form says what is covered; the causes-of-loss form says which perils trigger coverage. There are three:

• Basic Form — a list of fundamental named perils: fire, lightning, explosion, windstorm/hail, smoke, aircraft/vehicles, riot/civil commotion, vandalism, sprinkler leakage, sinkhole collapse, and volcanic action.
• Broad Form — everything in Basic plus additional named perils: falling objects; weight of snow, ice, or sleet; water damage (certain accidental discharge); and collapse as an additional coverage.
• Special Form — open-peril ("all-risk") coverage: all causes of loss are covered except those specifically excluded. This is the broadest and most popular, and it shifts the burden of proving an exclusion to the insurer.

Coinsurance in commercial property

Commercial property almost always includes a coinsurance clause, typically 80%, 90%, or 100%. The insured must carry a limit at least equal to that percentage of the property's value, or pay a penalty at claim time.

The formula is the same as personal lines:

Payment = (Limit carried ÷ Limit required) × Loss − Deductible

Example: A building is worth $1,000,000 with 80% coinsurance, so the required limit is $800,000. The owner carries only $600,000 and suffers a $200,000 loss.

• Ratio: $600,000 ÷ $800,000 = 0.75
• Payment: 0.75 × $200,000 = $150,000 (before deductible)

The owner absorbs the $50,000 difference as a coinsurance penalty. An agreed value option can suspend coinsurance when the insured documents the value up front.

Business income and extra expense

When a business shuts down after a property loss, the building damage is only half the story — the lost earnings can be devastating. Two time-element coverages address this:

• Business Income (also called business interruption): replaces the net income the business would have earned plus continuing normal operating expenses (like payroll and rent) during the period of restoration — the time it reasonably takes to repair and resume operations. It often includes a brief extended business income period after reopening while sales recover.
• Extra Expense: pays the additional costs a business incurs to keep operating or to speed up reopening — temporary relocation, renting equipment, overtime. Some businesses that cannot afford any downtime buy Extra Expense alone.

These are "time-element" coverages, because the payout depends on time (how long operations are disrupted), not on physical property value.

Common policy conditions

The Common Policy Conditions apply across the whole commercial policy:

• Cancellation — how and when the insured or insurer can cancel, with notice requirements.
• Changes — only the first named insured can request policy changes.
• Examination of books and records — the insurer may audit.
• Inspections and surveys — the insurer may inspect the premises.
• Premiums — the first named insured is responsible for paying.
• Transfer of rights and duties (assignment) — the policy cannot be assigned without insurer consent.

The Commercial Property Conditions add property-specific rules on concealment/fraud, control of property, insurance under more than one coverage, legal action, liberalization, no benefit to bailee, other insurance, policy period/territory, and transfer of recovery rights (subrogation).

The commercial package concept

A commercial package policy (CPP) combines two or more coverage parts under one policy — for example, commercial property + general liability + crime + commercial auto. Benefits include:

• Convenience: one policy, one renewal, fewer gaps.
• Cost savings: package discounts versus separate "monoline" policies.
• Flexibility: tailor coverage to the specific business with modular parts.

The package always starts with the common declarations and common conditions, then adds the chosen coverage parts.

Common exam traps

• BPP categories: Building, Your Business Personal Property, and Personal Property of Others are three distinct items with separate limits.
• Coverage form vs. causes-of-loss form: the BPP says what is covered; the causes-of-loss form says which perils. You need both.
• Special form = open-peril, and the insurer must prove an exclusion applies.
• Coinsurance penalty compares carried vs. required (value × %), not carried vs. loss.
• Business Income vs. Extra Expense: business income replaces lost earnings + continuing expenses; extra expense pays added costs to keep running.
• Tenant's improvements and betterments are insured by the tenant under Business Personal Property, not by the landlord.

Key terms at a glance

• BPP form — building, business personal property, and property of others.
• Causes-of-loss forms — basic (named), broad (expanded named), special (open-peril).
• Coinsurance — insure to the required percentage of value or share the loss.
• Period of restoration — the time used to measure business income loss.
• Time-element coverage — business income and extra expense.
• CPP — commercial package policy combining multiple coverage parts.

Quick recap

• Commercial property is modular: declarations + conditions + a coverage form (BPP) + a causes-of-loss form.
• The BPP form insures the building, your business personal property, and personal property of others.
• The causes-of-loss forms set the perils: basic and broad are named-peril; special is open-peril.
• Coinsurance (often 80/90/100%) penalizes underinsurance using carried ÷ required × loss.
• Business income replaces lost earnings and continuing expenses; extra expense pays to keep operating — both are time-element coverages.
• Combining coverage parts creates a commercial package policy with cost and convenience advantages.