How Chicago Home Sellers Can Identify Genuinely Comparable Sales

A Chicago homeowner should call a closed sale genuinely comparable only after confirming that it competed for the same buyers and matches the subject closely enough in market area, site, property type, legal characteristics, finished area, room count, style, condition, layout, material features, sale timing, transaction terms, concessions, and data reliability. There is no evidence-supported universal radius, age cutoff, price-per-square-foot formula, adjustment amount, or comp weighting for a Chicago listing. Choose and weight sales only after verifying the subject property, each transaction, the relevant market area, material differences, concessions, and current market conditions. Fannie Mae's cited material is mortgage appraisal policy, not a seller pricing instruction or listing-price guarantee. A comparative market analysis, appraisal, and final list-price decision have different purposes and must use the actual property and current market evidence. A nearby or recent sale is not automatically genuinely comparable. Similarity, competitive market appeal, physical and legal characteristics, condition, transaction terms, concessions, data reliability, and market timing still require verification. Cook Viewer's automated filters and assessment information do not establish market value or listing comparability. Use the tool as a lead for property-characteristic and assessment research, then verify sale and property facts from appropriate transaction and property sources. The Chicago zoning map does not establish legal compliance, permitted use, property condition, or value. Verify the current parcel, zoning designation, applicable code, permits, and any legal-use question with the responsible City department and appropriate professionals. Public, MLS, agent, builder, tax, deed, and third-party records can be incomplete, stale, or financially interested. Record the specific source for every comp fact and independently verify material transaction, concession, property, and arm's-length details. Market-based adjustments cannot be supplied from this general evidence for a specific home. Do not invent dollar, percentage, time, condition, location, feature, or concession adjustments; derive them from current verified market evidence or obtain a qualified appraisal. This evidence contains no subject address, candidate sale set, verified MLS facts, property inspection, appraisal, current Chicago price conclusion, or client-specific result. Do not invent any Jovanka Corazzina performance, credential, representation, or local-experience claim.

Start with the subject property, not a radius

Build the subject-property record before searching for sales. Capture the exact address and parcel, property type, site, legal characteristics, finished area, room and bedroom count, style, layout, condition, quality, material improvements, parking, external influences, zoning context, and the features buyers would notice.

The Fannie Mae improvements guidance treats property characteristics and condition as explicit appraisal inputs. That policy helps identify facts to verify; it does not determine a Chicago seller's listing price.

Use separate pages for separate decisions: the Chicago initial asking-price guide, the Chicago inspection-contingency checklist, the Chicago buying-and-selling coordination guide, and the contact page. None supplies subject facts, comp adjustments, or a price conclusion.

Do not begin with “within one mile” or “sold within six months” and assume every result is comparable. Those can be search parameters, but the evidence must show why the sale competed for the same buyers and how every material difference affects the analysis.

Define the market area by buyer competition

Fannie Mae's comparable-sales guidance emphasizes similarity and competitive market appeal. Define the market area from actual buyer alternatives, property type, location influences, access, lot or building context, legal characteristics, and current supply rather than from a universal circle.

Start in the subject's competitive area. If the available closed sales are thin, expand only with a written reason. A sale across a boundary may still compete for the same buyers; a sale on the same block may not if its property type, legal use, site, condition, layout, or market appeal differs materially.

Document the rationale for including or excluding each sale. The file should state which buyers would consider both properties, which characteristics align, which differ, and which current market evidence supports the chosen market-area treatment.

Verify every sale and transaction condition

For every candidate sale, record the contract date, closing date, sale price, source, property characteristics, concessions, financing, sale conditions, arm's-length status, and any relationship or financial interest in the data. Preserve the exact source and retrieval date for every fact.

Fannie Mae's sales comparison approach guidance requires verification and analysis of comparable transactions within its appraisal policy. A seller analysis should likewise resolve conflicts between MLS, public, deed, tax, agent, builder, and third-party records before assigning weight.

Concessions and unusual terms matter because the reported sale price may reflect more than the real-property comparison. Ask what was included, whether the transaction was arm's length, whether personal property or atypical financing affected the result, and whether the sale condition is documented by a reliable source.

Chicago comparable-sale verification matrix

The matrix is an evidence checklist, not a property valuation. It supplies no subject facts, candidate-sale verdict, adjustment, weighting, or list price.

Prefer similarity over automatic recency

Recent sales are useful because markets change, but recency is not a substitute for similarity. Fannie Mae's comparable-sales policy allows an older sale to be more appropriate when it is more similar and the analysis explains the time difference with evidence.

Compare both contract and closing dates with the subject's intended listing period. Then identify evidence of changing supply, demand, concessions, financing conditions, and buyer behavior. Do not apply a monthly percentage or age cutoff unless current verified market evidence supports it.

Build a candidate set broad enough to test the pattern, then weight the sales that best match buyer competition and the subject's material characteristics. The closest, newest, highest, or lowest sale does not automatically deserve the most weight.

Support differences with market evidence

Fannie Mae's adjustments guidance says adjustments should reflect demonstrated market reaction rather than arbitrary rules. Test differences through paired sales, grouped data, sensitivity checks, professional analysis, or other current evidence appropriate to the market.

Keep the raw sale price separate from any analytical adjustment. For each difference, record the fact, source, market evidence, method, uncertainty, and effect on weighting. Do not copy a price-per-square-foot delta across dissimilar homes or treat construction cost as market reaction without supporting evidence.

If a material difference cannot be supported, reduce the sale's weight or obtain a qualified appraisal rather than inventing a number. A transparent unresolved limitation is more useful than a precise-looking unsupported adjustment.

Use Cook County and Chicago tools within their limits

Cook County's Find Comparable Properties tool can surface leads using neighborhood, class, square footage, and age filters. The Assessor warns that the returned properties are not necessarily comparable. Use it to collect parcel and assessment research leads, not to choose listing comps or establish market value.

Chicago's zoning map help explains parcel and zoning lookup functions. Confirm the current parcel and displayed designation, then ask the responsible City department and appropriate professionals about applicable code, permits, legal use, nonconformity, or other questions. A map label is not proof of compliance, condition, use rights, or value.

Reconcile official lookup fields with transaction, MLS, inspection, deed, and other property evidence. Record mismatches rather than choosing the convenient version. Only after the subject, market area, sale facts, concessions, and material differences are verified should a sale receive weight in the seller's pricing file.

Frequently asked questions

Is the closest recent sale automatically the best comp?

No. The cited policy emphasizes similarity and competitive market appeal; an older but more similar sale can be more appropriate when the difference is supported and explained.

How many closed sales should I review?

The cited Fannie Mae appraisal policy requires at least three closed comparables in the sales comparison approach, but a seller analysis may review a broader verified set before deciding which sales deserve weight.

Can Cook Viewer select my listing comps?

It can surface properties using neighborhood, class, square footage, and age filters, but the Assessor warns those matches are not necessarily comparable and the tool is not a listing-price opinion.

Can I adjust every comp by the same price per square foot?

No. Fannie Mae says adjustments should reflect demonstrated market reaction rather than an arbitrary rule, and this evidence supplies no property-specific adjustment amount.