Market Comparable Analysis
Every identification and value calculation in an Illinois exchange depends on knowing what a property is actually worth, and that is a much easier question to answer in some parts of the state than others. Chicagoland has deep, current broker comparable-sale data for almost every asset class, while a downstate Illinois parcel might have only a handful of genuinely comparable sales in the last several years, if that. Getting this analysis right shapes almost every other decision in the exchange, from the identification rule chosen to whether a DST allocation makes sense as a supplement.
Why Chicagoland Data Is a Different Animal Than Downstate Data
Industrial and multifamily transactions along the I-55 and I-80 corridors, and across Cook and the collar counties, get tracked closely by commercial brokers and appear in databases with recent, granular detail, down to price per square foot by submarket and building class. A downstate Illinois farm parcel or a small commercial building in a town like Decatur or Champaign may not have a truly comparable sale within a reasonable distance or time frame, which means the analysis has to lean more heavily on broader agricultural land value trends or income-based valuation rather than a tight set of recent comps. Bloomington and Springfield sit somewhere in between, with enough transaction volume from institutions like State Farm and the state government presence to support a reasonable comparable set, even if it is thinner than what a Naperville or Schaumburg deal would generate. Champaign benefits similarly from steady activity tied to the university, though even there the pool of directly comparable commercial sales in a given year can be small.
How We Build a Comparable Set for a Thin Downstate Market
When recent, truly comparable sales are scarce, we widen the geographic radius before we widen the property type, since two dissimilar buildings in the same town are usually less useful than two similar buildings a bit farther apart. We also weight income-based valuation more heavily for downstate Illinois properties with a real income stream, since replacement cost and sparse sales comps alone can understate or overstate value in a market with few recent transactions to anchor against. This approach matters most for farmland, where per-acre values can vary by soil quality and drainage even within the same downstate Illinois county.
What Goes Into a Usable Comparable Package
- Recent sale prices for genuinely similar properties, weighted toward the same submarket first
- Price per square foot or per acre adjusted for condition, age, and location within the Illinois submarket
- Current asking prices for active listings, used cautiously since they are not confirmed sales
- Income-based valuation for any property with a stable, verifiable rent roll
- Property tax burden by county, since that materially affects a buyer's real return even at the same price
We present this package the same way whether the subject property sits in the Loop or on a quiet stretch of downstate Illinois road, so the investor is comparing apples to apples across very different submarkets.
Why This Feeds Directly Into Identification Strategy
An identification list built under the 200-percent rule lives or dies on accurate valuation, since a comparable set that understates a Chicagoland candidate's true value can push the running total over the cap without anyone noticing until it is too late to fix. We build the comparable analysis before the identification list is finalized, not as a formality afterward, precisely because the numbers here directly determine which Illinois identification rule even makes sense for a given exchange.
Keeping the Analysis Current Through Closing
A comparable set built in week one of an Illinois exchange can go stale by week twelve if the local market moves, particularly in a fast-moving Chicagoland submarket where new sales close every month. We refresh the comparable analysis at key checkpoints, identification and again before closing, rather than treating the first valuation as good for the life of the exchange, since a stale number can mean an investor overpays for a replacement property or misjudges how much cushion actually exists under the identification cap.
Common 1031 Exchange Questions
Why is downstate Illinois comparable data harder to find?
Lower transaction volume means fewer recent sales to draw from, and many downstate deals, especially agricultural ones, are negotiated privately without appearing in commercial broker databases the way Chicagoland deals do.
Can an active listing be used as a comparable sale?
It can inform a valuation but should be weighted cautiously, since an asking price reflects what a seller wants, not what a buyer has actually agreed to pay, which is what a true comparable sale represents.
Does property tax get factored into comparable value analysis?
Yes, we include county-level property tax burden in the comparable package because two similarly priced Illinois buildings can have very different after-tax returns depending on whether they sit in Cook County or elsewhere.
How far should a comparable search radius extend in a thin downstate market?
As far as needed to find genuinely similar properties before broadening to dissimilar property types nearby, since a comparable building a little farther away is usually more useful than a very different one close by.
Who typically prepares this analysis, a broker or an appraiser?
Both can contribute. We often start with broker opinions of value for speed during the identification window and recommend a formal appraisal when precision matters more, such as near the 200-percent identification cap on a large Illinois exchange.
