Why Stated Expenses Rarely Match Reality in IL Multifamily
Small multifamily owners in Illinois often manage their own properties and keep informal records. When it comes time to sell, they may present a simplified income and expense summary rather than a full set of audited financials. That summary tends to reflect what the owner actually paid out of pocket, not the full economic cost of operating the property.
Several patterns appear repeatedly in Illinois deals.
Owner labor is invisible. A landlord who handles their own maintenance, leasing, and tenant communication does not write themselves a check. So that cost never appears on the expense statement. When a buyer takes over and hires a property manager, they are suddenly paying 8 to 10 percent of gross rents in management fees that were never in the seller's numbers.
Property taxes are presented at the wrong year. Cook County operates on a triennial reassessment cycle, meaning properties are reassessed every three years on a rotating township schedule. A seller may show you last year's tax bill, which could reflect a pre-reassessment value. If the property is due for reassessment, your actual tax burden after closing could be meaningfully higher. Buyers in Cook County should always check the current assessment cycle for the specific township and request the most recent tax bill alongside the prior two years.
Insurance is underpriced or bundled. Some small landlords carry a landlord policy on a property that has not been updated in years. Others bundle multiple properties under one policy and allocate a portion to each building in a way that does not reflect standalone replacement cost. Chicago-area insurance costs have trended upward in recent years, particularly for older frame construction. A quote from an independent agent for the specific building gives you a more accurate baseline than the seller's current premium.
Utilities are partially omitted. In buildings where the owner pays common area electric, water, or gas for vacant units, those costs may be inconsistently tracked. If a building had high vacancy in a given year, the utility line may look lower than it will be at stabilized occupancy.
Understanding these patterns before you start reviewing documents helps you know where to focus your attention.
The Core Documents Buyers Should Request and Review
Verification starts with getting the right paperwork. A seller's one-page income and expense summary is a starting point, not a source of truth. Here is what to request.
Two to three years of bank statements for the account used to pay property expenses. This is the most reliable record of what actually left the owner's account. Cross-reference deposits against the rent roll to verify income, and cross-reference withdrawals against the stated expense categories.
Actual utility bills for the trailing 12 months. Ask for ComEd, Nicor Gas, and water and sewer bills in the owner's name. In Chicago and many Chicagoland municipalities, water and sewer is billed by the city and can be a significant expense in older buildings with aging plumbing. Compare the bills to what the seller listed on the expense statement.
Property tax bills for the prior three years. Given Cook County's reassessment cycle, three years of bills gives you a trend line and helps you identify whether a reassessment is pending. For properties outside Cook County, check the relevant county assessor's website for the current assessed value and any pending appeals.
Insurance declarations pages for the current policy. Review the coverage limits, the premium, and the policy type. Then get an independent quote for comparison.
Maintenance and repair invoices. Ask for receipts or invoices for any repair work in the trailing 24 months. This helps you identify deferred maintenance that the seller may have excluded from the expense statement because it was not paid yet, and it gives you a sense of the building's ongoing maintenance demands.
Any existing property management agreements. If the seller uses a manager, the contract will show the fee structure and any additional charges for leasing, maintenance coordination, or inspections.
Reviewing these documents alongside the seller's stated numbers is where the real underwriting begins. For a broader look at what serious buyers review during this phase, see small multifamily due diligence: what serious NC buyers actually review, which covers the document review framework in detail even if the geographic context differs.
Line Items Most Commonly Understated in Small IL Buildings
Once you have the documents, focus your reconciliation effort on the categories where gaps are most common.
Property management. As noted above, self-managed properties show zero management expense. Buyers should add a market-rate management fee to their underwriting regardless of whether they plan to self-manage. In the Chicago metro, fees for small multifamily typically range from 8 to 10 percent of collected rents, with some managers charging a flat monthly fee per unit. This is an economic cost of the asset, not an optional line item.
Property taxes. Use the actual tax bills, not the seller's summary. For Cook County properties, cross-check the PIN (property index number) on the Cook County Assessor's website to confirm the current assessed value and any pending appeals or exemptions. Note that some sellers carry homeowner exemptions on owner-occupied two-flats that will not transfer to an investor buyer, which means the tax bill will increase after sale.
Repairs and maintenance. Industry benchmarks for older Illinois multifamily often run between 5 and 10 percent of gross rents annually, depending on building age and condition. If the seller's stated maintenance expense is well below that range, ask for the invoices. Either the building has been unusually well maintained (verify with an inspection) or costs have been deferred or omitted.
Capital expenditures. Small landlords rarely include a CapEx reserve in their expense statements. Roofs, HVAC systems, water heaters, and electrical panels are not annual expenses, but they are real costs that a buyer must plan for. Estimating a reserve of 5 to 15 percent of gross rents, depending on building age and recent capital work, gives you a more accurate picture of true operating cost.
Vacancy and credit loss. A seller who has had the same tenants for several years may show near-zero vacancy. That is a historical number, not a forward-looking one. A standard underwriting assumption for small Illinois multifamily is 5 to 8 percent vacancy and credit loss, adjusted for local market conditions. College-town markets and seasonal rental markets may warrant higher assumptions.
Landscaping, snow removal, and trash. In Illinois, snow removal is not optional. Small landlords sometimes handle this themselves or informally pay a neighbor. Neither shows up as a line item. Get quotes for contracted services if you plan to outsource these tasks.
For context on how these expense patterns affect the income side of the equation, the NC multifamily rent roll red flags that kill deals article covers how income misrepresentation compounds the expense problem during underwriting.
How to Reconcile Seller Numbers Against Third-Party Sources
Once you have the documents and you know which line items to scrutinize, the reconciliation process is straightforward.
Start by building a simple spreadsheet with two columns: the seller's stated expense for each line item, and your verified or estimated figure based on the documents and third-party sources. The gap between the two columns is your underwriting adjustment.
For property taxes, use the actual bills and the county assessor's data. For utilities, use the actual bills. For insurance, use an independent quote. For management, use market-rate fees from local property managers. For maintenance and CapEx, use the invoice history plus a reserve estimate based on building age and condition.
Third-party benchmarks are also useful for sanity-checking. The Institute of Real Estate Management (IREM) publishes income and expense data for apartment buildings by market and building size. While these benchmarks are not a substitute for property-specific analysis, they help you identify when a seller's numbers are implausibly low.
Local property managers in the Chicago area and Chicagoland suburbs can also provide informal benchmarks for what they typically see in operating costs for buildings similar to the one you are evaluating. A brief conversation with two or three managers during due diligence is worth the time.
For properties where the cap rate is central to your offer price, understanding how expense verification feeds into your valuation is essential. The article on how to calculate cap rates for small multifamily properties in North Carolina explains the mechanics clearly, and the same math applies in Illinois.
What to Do When the Numbers Do Not Add Up
Finding a gap between the seller's stated expenses and your verified figures is common. What matters is how large the gap is and how you respond to it.
Quantify the impact on value first. If your verified NOI is lower than the seller's stated NOI, recalculate your offer price using your numbers. A $5,000 annual expense understatement at a 6 percent cap rate represents roughly $83,000 in value. That is a meaningful number in a negotiation.
Go back to the seller with specifics. Vague concerns about expenses rarely move a negotiation. Specific documentation does. Present the actual utility bills, the tax assessor's data, or the management fee quotes that support your adjusted figures. Sellers who have clean records will be able to respond. Sellers who cannot explain the discrepancy are telling you something important.
Adjust your offer or walk away. If the seller cannot or will not reconcile the gap, you have two options: adjust your offer to reflect your verified numbers, or walk away. Neither is a failure. Overpaying because you accepted unverified expense claims is the outcome to avoid.
Use the due diligence period. Illinois purchase contracts typically include a due diligence or inspection period. Use that window to complete your expense verification before you are committed. If your contract does not include adequate time for financial review, negotiate for it before you go under contract.
Buyers who find significant expense discrepancies often benefit from connecting with sellers who have already prepared organized financials. Clean documentation on the seller's side reduces the back-and-forth and shortens the path to closing. If you are still searching for the right property, the FlowExit learn library covers additional due diligence topics that apply to small multifamily buyers across markets.
Expense verification is not about distrust. It is about building a clear picture of what you are actually buying, so your underwriting reflects the real economics of the asset rather than the seller's best-case presentation.