Run property due diligence in Wisconsin without surprises after closing in 2026

Wisconsin commercial property has two checks that are easy to miss: shoreland zoning, which applies to all commercial development within 1,000 feet of a navigable lake or 300 feet of a navigable river statewide, and the Tyco International PFAS contamination in Marinette County - one of the most significant non-military PFAS manufacturing contamination sites in the Midwest.

Wisconsin's shoreland zoning program is administered by Wisconsin DNR (through Wis. Admin. Code NR 115 for unincorporated areas) and applies to commercial development near Wisconsin's more than 15,000 named lakes and extensive river systems. Shoreland zoning sets minimum setbacks from ordinary high water marks, impervious surface limits, and vegetation buffer requirements for commercial development within the shoreland zone. Commercial property within the shoreland zone that was developed before current shoreland zoning standards may be non-conforming; expansions or changes of use can trigger compliance reviews.

PFAS in Marinette County: Tyco International (and related companies) manufactured AFFF (aqueous film-forming foam) containing PFAS compounds at a facility in Marinette, Wisconsin; PFAS contamination from manufacturing and testing affected groundwater and drinking water in the Marinette and Peshtigo areas of Marinette County. This is one of the most significant non-military PFAS manufacturing contamination sites in the Midwest and has been the subject of major litigation.

Wisconsin's Real Estate Transfer Fee is $3 per $1,000 of consideration (0.3%), paid by the seller. Title companies (without attorney supervision) can close Wisconsin commercial real estate transactions; attorney involvement is not legally required but is common for complex commercial deals. Wisconsin property records are maintained at the county register of deeds.

Set up an Ellty due diligence data room before diligence opens. Load ALTA title, Wisconsin DNR records, Phase I ESA, shoreland zoning documents, and lease files before advisors arrive.

Where Wisconsin property deals go wrong

Not every check carries the same weight. The table below sorts risks by deal impact - dealbreakers first, then what moves the price, then basic hygiene - so your Wisconsin attorney and environmental consultant know what to clear first.

Wisconsin CRE checklist

The table ranked risks by severity. This is the full list to work through, grouped by area.

Title - county register of deeds

• Order the ALTA owner's title commitment from a Wisconsin-licensed title insurer on day one
• Wisconsin property records are maintained at the county register of deeds; title searches run against the county grantor-grantee index; most Wisconsin county register of deeds offices have online deed search access
• Wisconsin title companies can close commercial real estate transactions without attorney supervision; however, for complex commercial deals, engaging Wisconsin real estate counsel is standard practice
• Confirm the deed in the chain of title is a warranty deed (not quitclaim); warranty deed chains are standard for arm's length commercial transactions in Wisconsin
• UCC fixture filings: search Wisconsin DPFI (Department of Financial Institutions) UCC database for any fixture filings against the commercial parcel
• ALTA/NSPS survey: confirm commercial boundaries, easements, and any encroachments

Shoreland zoning - lakes and rivers

• Confirm whether the commercial property is within the Wisconsin shoreland zone (within 1,000 feet of the ordinary high water mark of a navigable lake or 300 feet of a navigable river or stream) in an unincorporated area
• Wis. Admin. Code NR 115: Wisconsin DNR administers minimum shoreland zoning standards for all Wisconsin counties; counties administer their own shoreland zoning ordinances which must meet or exceed NR 115 minimums
• NR 115 minimum standards for commercial development: 75-foot setback from ordinary high water mark (OHWM); maximum 15-30% impervious surface depending on lot size; 35-foot vegetative buffer zone adjacent to the water
• Non-conforming shoreland structures: commercial structures that predate current shoreland zoning standards may have non-conforming status with limited expansion rights; under NR 115 revisions, non-conforming commercial structures can be repaired but major expansion that increases non-conformity may be restricted
• For incorporated municipalities (cities and villages) in shoreland areas: municipalities administer their own shoreland zoning, which may differ from NR 115 county standards; confirm the relevant ordinance
• Ordinary high water mark (OHWM) determination: if the OHWM is unclear for a water-adjacent commercial property, Wisconsin DNR can determine the OHWM; inaccurate OHWM assumptions can invalidate setback calculations

Set up each advisor's access in Ellty. Wisconsin attorney or title company sees title chain. Environmental consultant sees Wisconsin DNR records and Phase I. Shoreland zoning consultant sees OHWM determination and county ordinance. Lender sees valuation and rent roll.

PFAS - Tyco Marinette and Wisconsin statewide

• Search Wisconsin DNR's PFAS database and EPA's PFAS contamination site locator for the property location and surrounding area
• Tyco International Marinette contamination: Tyco International and related companies (including what became the Fire Protection segment) manufactured AFFF at a Marinette, Wisconsin facility; PFAS from manufacturing and testing contaminated groundwater in the Marinette and Peshtigo areas of Marinette County; affected public and private water supplies in the area
• Marinette County commercial diligence: for any commercial property in Marinette or Peshtigo with private well water: commission PFAS well testing; confirm Wisconsin DNR monitoring well results and any remediation active at or near the site
• Wisconsin DNR PFAS response: Wisconsin DNR has been actively monitoring PFAS statewide and has established PFAS standards for groundwater and drinking water in Wisconsin Administrative Code NR 140
• For any Wisconsin commercial property with private well water: commission PFAS well testing alongside Phase I ESA (lab results take 3-5 weeks)

Environmental - Milwaukee and industrial legacy

• Commission Phase I ESA meeting ASTM E1527-21 from a Wisconsin DNR-familiar environmental professional
• Wisconsin DNR Environmental Remediation database: publicly searchable database of Wisconsin contaminated sites managed under the Wis. Stats. NR 700 series; search by property address or latitude/longitude
• Milwaukee industrial corridor: Milwaukee County has documented contamination from the city's industrial past (tanneries, foundries, machine shops, electroplating, and brewing); the Milwaukee River and Harbor areas, and the Menomonee River Valley (a major Milwaukee industrial redevelopment area), have legacy contamination
• Menomonee River Valley: a significant Milwaukee brownfield redevelopment zone with ongoing site remediation; many parcels have active or completed Wisconsin DNR environmental remediation cases; confirm case status before bidding
• PECFA (Petroleum Environmental Cleanup Fund Award): Wisconsin's state petroleum cleanup fund for UST releases; search DNR PECFA database for any UST releases affecting the commercial parcel; PECFA can pay eligible cleanup costs for qualifying petroleum releases

Track document access in Ellty. If the environmental consultant accesses the DNR Environmental Remediation database and the PECFA records repeatedly, they're building the Phase II scope. Know before the formal report.

Military PFAS - Wisconsin bases

• Search Wisconsin DNR's PFAS database for military installations near the property
• Truax Field Air National Guard Base (Madison, Dane County): documented PFAS contamination from AFFF use; commercial properties in Madison near Truax Field with private well water require PFAS screening
• Volk Field Air National Guard Base (Camp Douglas, Juneau County): confirmed PFAS contamination from AFFF; commercial development near Volk Field should include PFAS assessment
• Fort McCoy (Monroe County, Sparta area): documented PFAS contamination from AFFF; commercial properties near Fort McCoy in Monroe County require PFAS screening

Flood risk - Wisconsin river systems

• Pull FEMA FIRMs for the property's flood zone designation; Wisconsin commercial river corridor properties may be in SFHAs
• Wisconsin counties administer county floodplain zoning ordinances that must be consistent with FEMA maps; confirm both FEMA flood zone and county floodplain zoning designation
• Wisconsin rivers with commercial flood exposure: Wisconsin River (Stevens Point, Wisconsin Rapids, Wausau corridor), Fox River (Green Bay, Appleton, Oshkosh), Black River (La Crosse area), Chippewa River (Chippewa Falls, Eau Claire), Milwaukee River and Menomonee River (Milwaukee metro), and Rock River (Janesville, Beloit)
• For commercial properties along these river systems in FEMA SFHAs: NFIP coverage is required for federally-backed mortgages

Zoning and comprehensive planning

• Confirm the zoning designation from the applicable city, village, or county zoning department
• Wisconsin Smart Growth (Wis. Stats. 66.1001): Wisconsin requires all municipalities and counties to adopt comprehensive plans; all land use decisions, including zoning and conditional use permits, must be consistent with the adopted comprehensive plan
• For proposed commercial development or rezoning: confirm consistency with the adopted comprehensive plan before assuming zoning can be obtained; a comprehensive plan amendment may be required and is a public process
• Wisconsin agricultural zoning: in some Wisconsin counties (particularly rural western and central WI), agricultural preservation zoning restricts commercial development of agricultural land; confirm the parcel isn't subject to farmland preservation restrictions before planning commercial development

Compare Michigan's commercial property diligence process when running Great Lakes or Midwest portfolio acquisitions. Michigan and Wisconsin share Great Lakes shoreland concerns, automotive and industrial legacy contamination, and PFAS exposure from both military and manufacturing sources. Key Wisconsin differences: Wisconsin's shoreland zoning program (NR 115) applies more broadly and with different setback standards than Michigan's shoreland regulation; Wisconsin's PECFA petroleum cleanup fund has no direct Michigan equivalent; Wisconsin's PFAS manufacturing contamination from Tyco Marinette is geographically distinct from Michigan's Wolverine World Wide contamination.

Transfer fee and closing costs

• Wisconsin Real Estate Transfer Fee: $3 per $1,000 of consideration (0.3%); paid by seller; filed via the Wisconsin Real Estate Transfer Return (RETR form) at the county register of deeds
• No additional buyer's transfer tax in Wisconsin
• No Wisconsin mortgage recording tax
• Wisconsin closing costs for buyers: ALTA title insurance + environmental fees + legal/advisory; total buyer acquisition cost runs approximately 0.5-1% of purchase price (excluding environmental), making Wisconsin one of the lower-cost commercial real estate acquisition environments in the Midwest

Insurance and valuation

• Commission an MAI appraisal from a Wisconsin-licensed appraiser; Milwaukee and Madison markets have institutional comp data; Green Bay, Appleton, Racine/Kenosha, and Waukesha markets have reasonable data sets
• Pollution legal liability (PLL) insurance: for Milwaukee or Menomonee Valley brownfield acquisitions, lenders typically require PLL coverage; commission PLL quotes alongside the Phase I ESA
• Standard commercial property insurance in Wisconsin is generally available at reasonable rates; waterfront commercial may face higher wind and ice insurance costs

Leases - Wisconsin commercial terms

• Abstract every commercial lease for rent, operating expense structure, renewal options, and termination rights
• For Milwaukee mixed-use or brewery-conversion commercial (former Pabst and Schlitz brewery sites): review tenant lease provisions around building systems, historic preservation compliance, and specialized HVAC requirements common in historic conversion commercial
• For Madison commercial with biotech or university-affiliated tenants: review lease provisions around research equipment installations, specialized utility requirements, and permitted use clauses

Load all lease abstracts, Wisconsin DNR records, Phase I, and shoreland zoning documents into Ellty. Title company or Wisconsin attorney sees closing documents. Environmental consultant sees DNR and Phase I records. Lender sees valuation and lease abstracts. Track who reviews what and when.

How due diligence works in Wisconsin

Step 1 - Title and shoreland zoning

Day one: order ALTA title commitment and simultaneously confirm whether the commercial property is within the Wisconsin shoreland zone. The shoreland zone check is fast: confirm the nearest navigable waterbody and measure the setback from the OHWM against the 1,000-foot (lake) or 300-foot (river) threshold.

If the property is in the shoreland zone: pull the county shoreland zoning ordinance and confirm compliance for existing structures. Engage a Wisconsin DNR-familiar zoning consultant if OHWM determination is uncertain.

Step 2 - PFAS and environmental

Commission Phase I ESA with Wisconsin DNR database search (Environmental Remediation database, PECFA database) alongside standard federal databases. For Marinette County or any Wisconsin commercial property with private well water: commission PFAS well testing alongside the Phase I.

For Milwaukee metro industrial areas: Phase II is commonly expected by Wisconsin commercial lenders; commission Phase I and Phase II together if industrial history is documented.

Step 3 - Flood zone and zoning

Pull FEMA FIRMs and county floodplain zoning. For Wisconsin river corridor commercial: confirm both FEMA designation and county floodplain zoning ordinance classification.

Confirm zoning from the city, village, or county planning department. Confirm consistency with the adopted Wisconsin comprehensive plan if any rezoning or conditional use permit is needed.

Load all Phase I, DNR records, PFAS data, shoreland zoning, and FEMA maps into Ellty. Advisors get scoped access; track who reviews what before formal reports are delivered.

Step 4 - Leases and closing prep

Abstract all leases. Model Wisconsin transfer fee (seller pays 0.3%) and buyer acquisition costs. Wisconsin commercial closings are handled by title companies or attorneys; no attorney requirement.

Budget 30-60 days for standard Wisconsin commercial diligence; shoreland compliance review and PFAS testing add time if triggered.

What makes Wisconsin different

Wisconsin's shoreland zoning program is the due diligence item that out-of-state buyers most consistently underestimate. Wisconsin has over 15,000 named lakes and a network of navigable rivers; the shoreland zone (1,000 feet from navigable lakes, 300 feet from navigable rivers) covers an enormous proportion of the commercial real estate in northern Wisconsin resort communities, lakefront commercial in Madison and Milwaukee suburbs, and river-corridor commercial across the state. The setback requirements, impervious surface limits, and vegetative buffer requirements can significantly constrain what's buildable or expandable on a Wisconsin waterfront commercial parcel. Confirm shoreland zoning status before pricing any Wisconsin commercial property with water adjacency.

Tyco Marinette's PFAS contamination is Wisconsin's most geographically concentrated commercial real estate PFAS risk. Unlike military base PFAS plumes that are relatively bounded, Tyco's manufacturing and testing activities created PFAS contamination that entered municipal and private water supplies in the Marinette and Peshtigo area. Wisconsin DNR has been active in monitoring and response; any commercial property in Marinette County with private water supply requires PFAS well testing before closing.

Milwaukee's brownfield opportunity is real and actively being redeveloped. The Menomonee River Valley, the former Pabst and Schlitz brewery sites, the Harbor District, and the 30th Street Industrial Corridor are all active Milwaukee brownfield redevelopment zones. Wisconsin's combination of DNR-administered environmental remediation, PECFA petroleum cleanup fund reimbursements, and local Tax Increment Financing (TIF) has made Milwaukee brownfield deals financially viable. The key is engaging Wisconsin environmental and brownfield finance consultants who know the specific programs and TIF history for each parcel.

Wisconsin's transfer fee at 0.3% of consideration (seller-paid) is among the lowest in the Great Lakes region. Michigan's transfer tax runs 0.86%; Illinois real estate transfer taxes run higher; Ohio's conveyance fee is comparable. Wisconsin buyers face very low transfer tax burden, making Wisconsin commercial acquisitions less expensive at the transaction level than most surrounding states.

Timeline and cost in Wisconsin

Weeks 1-2 cover kickoff: ALTA title commitment order, shoreland zone confirmation and county shoreland zoning ordinance review, Wisconsin DNR Environmental Remediation database search, PECFA database search, Phase I ESA commission, PFAS screening assessment, FEMA flood zone check, zoning confirmation, and lease abstraction initiation. Legal and advisory fees in this phase run USD 4,000-12,000.

Load all files into Ellty before advisors engage. Wisconsin commercial deals can move on 30-60 day timelines for standard assets; shoreland zoning review or PFAS testing add 2-5 weeks.

Weeks 2-4 cover deep review: Phase I ESA delivery, shoreland compliance analysis, PFAS well results (if commissioned), Wisconsin DNR brownfield case status, county floodplain zoning, lease abstraction, and insurance quotes. Costs in this phase: USD 8,000-25,000.

Weeks 4-8 handle resolution: Phase II ESA (if triggered), OHWM determination (if needed for shoreland), PLL insurance binding (if required), Wisconsin DNR case closure confirmation, title exception clearance, and closing.

Wisconsin total acquisition costs for buyers: ALTA title insurance + legal/advisory fees + environmental. Seller pays the 0.3% transfer fee. Buyer total acquisition cost typically runs 0.5-1.5% of purchase price, one of the lowest in the Great Lakes region.