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May 6, 2026 · Christopher J. Mokler

UNDERSTANDING ENVIRONMENTAL ISSUES IN COMMERCIAL REAL ESTATE

Environmental issues are a critical part of commercial real estate. While many properties have no significant problems, buyers and investors should always understand the potential risks associated with a site’s history, location, and prior use.

Environmental concerns can play a major role in commercial real estate transactions. Whether buying, selling, financing, or developing a property, environmental issues have the potential to delay deals, reduce property value, increase liability, and create unexpected costs for owners and investors.

Many buyers focus on location, building condition, and financial performance — all important factors — but overlooking environmental concerns can become a costly mistake. In some cases, environmental cleanup obligations can reach hundreds of thousands or even millions of dollars.

Understanding the basics of environmental due diligence can help buyers, sellers, landlords, and investors protect themselves and make more informed decisions.

Why Environmental Issues Matter! Unlike many other property concerns, environmental liability can sometimes extend to current property owners even if they did not cause the contamination.

In some situations:

  • A buyer can inherit environmental liability from a previous owner
  • Lenders may refuse financing
  • Insurance companies may limit coverage
  • Development plans may become restricted
  • Property values may decline significantly

Environmental concerns can affect:

  • Industrial properties
  • Gas stations
  • Agricultural land
  • Warehouses
  • Manufacturing facilities
  • Dry cleaners
  • Auto repair businesses
  • Older commercial buildings
  • Even some retail or office sites

Common Environmental Concerns in Commercial Real Estate:

  1. Underground Storage Tanks (USTs): One of the most common environmental risks involves underground storage tanks, particularly older fuel tanks.

Problems may arise from:

  • Leaking gasoline or diesel fuel
  • Corrosion
  • Improper abandonment
  • Unknown tank locations

Former gas stations, trucking facilities, farms, and industrial sites often present elevated risk. Even if a tank was removed years ago, contamination may still remain in the soil or groundwater.

  1. Soil and Groundwater Contamination: Commercial and industrial activities may leave behind contamination from:
  • Petroleum products
  • Solvents
  • Chemicals
  • Heavy metals
  • Industrial waste
  • Agricultural chemicals

Contamination can migrate underground and affect neighboring properties or water supplies.

Cleanup costs can be substantial depending on:

  • Severity
  • Depth
  • Groundwater involvement
  • Regulatory requirements
  1. Asbestos: Asbestos was commonly used in building materials before the 1980s.

It may be found in:

  • Insulation
  • Floor tile
  • Pipe wrapping
  • Ceiling materials
  • Roofing products

Asbestos is not always dangerous if left undisturbed, but renovation or demolition can trigger costly abatement requirements. Buyers of older commercial buildings should be aware of the potential for asbestos-containing materials.

  1. Lead-Based Paint: Buildings constructed before 1978 may contain lead-based paint. While often more associated with residential properties, lead concerns can still arise in commercial or mixed-use buildings.

Lead hazards become more significant during:

  • Renovation
  • Sanding
  • Demolition
  • Tenant improvements
  1. Mold and Moisture Issues: Water intrusion can lead to mold growth and indoor air quality concerns.

Common causes include:

  • Roof leaks
  • Poor drainage
  • Plumbing failures
  • HVAC issues
  • Flooding

Mold problems may:

  • Affect tenants
  • Lead to health complaints
  • Increase maintenance costs
  • Reduce occupancy
  1. Wetlands and Floodplains: Environmental issues are not always contamination-related. Wetlands and floodplain restrictions can significantly impact:
  • Development potential
  • Site planning
  • Stormwater management
  • Building placement

Properties near rivers, lakes, or low-lying areas may require additional permitting and engineering work. In Wisconsin and many other states, wetland regulations can heavily influence the usability and value of commercial land.

Phase I Environmental Site Assessments:

One of the most important tools in commercial real estate due diligence is the Phase I Environmental Site Assessment, commonly called a “Phase I ESA.”

A Phase I typically includes:

  • Historical property research
  • A site inspection
  • Review of government databases
  • Aerial photo analysis
  • Interviews and records review

The purpose is to identify “Recognized Environmental Conditions” (RECs) that may indicate contamination risk. Lenders frequently require a Phase I before approving financing on commercial properties.

What Happens if Problems Are Found? If the Phase I identifies potential concerns, additional investigation may be recommended.

This may include:

  • Soil testing
  • Groundwater sampling
  • Vapor intrusion testing
  • Tank locating
  • A Phase II Environmental Assessment

A Phase II involves actual sampling and laboratory analysis to determine whether contamination exists.

Environmental Issues and Financing: Environmental problems can complicate financing significantly.

Lenders may:

  • Delay approval
  • Require additional testing
  • Reduce loan amounts
  • Require cleanup
  • Decline financing altogether

Because lenders want to protect their collateral, environmental due diligence is often mandatory in commercial transactions.

Brownfield Redevelopment: Not all environmentally challenged properties are undesirable. Some contaminated or formerly industrial sites — known as “brownfields” — may qualify for:

  • Grants
  • Tax incentives
  • Redevelopment assistance
  • Liability protections

In some cases, buyers can acquire these properties at favorable pricing and create substantial value through redevelopment. Many communities encourage brownfield redevelopment to revitalize underused properties.

Seller Responsibilities: Sellers should understand that environmental issues can affect:

  • Marketability
  • Negotiations
  • Financing
  • Transaction timelines

Being proactive can help avoid surprises later in the transaction.

Some sellers choose to:

  • Obtain environmental reports before listing
  • Address known issues upfront
  • Maintain records of prior cleanup activities
  • Properly document tank removals and remediation

Environmental Due Diligence Is Essential: Environmental concerns should never be ignored simply because a property “looks clean.” Many environmental issues are invisible and may not become apparent until:

  • Financing begins
  • Inspections occur
  • Redevelopment is planned
  • Government records are reviewed

Proper due diligence can help buyers avoid major financial exposure and help sellers prepare properties for smoother transactions.

Final Thoughts: Environmental issues are a critical part of commercial real estate. While many properties have no significant problems, buyers and investors should always understand the potential risks associated with a site’s history, location, and prior use.

A careful environmental review can protect buyers, lenders, and sellers from unexpected liability while helping ensure a successful transaction.

Before purchasing or selling commercial property, investors should work with experienced professionals including:

  • Commercial real estate brokers
  • Environmental consultants
  • Attorneys
  • Lenders
  • Engineers

With proper due diligence and planning, environmental risks can often be identified early and managed effectively.

Questions? We can help! Contact Chris at 920-279-6104 or chris@cjmassociates.org

Christopher J. Mokler & Associates

Commercial real estate advisory across the State of Wisconsin. Chris Mokler is a licensed Wisconsin broker and an agent of Keller Williams–Fox Cities. Powered by KW Commercial.

Offices
1990 Walter Court
Oshkosh, WI 54901
517 N. Westhill Blvd
Appleton, WI 54915
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