ZIP market identifier 60637 is matched to a Census ZCTA. A ZCTA is a statistical area and is not identical to a USPS delivery ZIP. At the supplied Zillow endpoint, ZIP ZORI places typical observed asking rent at $1,851 per month, up 5.4% from a year earlier. Zillow ZORI is a blended asking-rent index across rental types, rather than a lease-specific quote or a measure of every available unit. Against matched-ZCTA median household income of $43,609, a 30% rent-to-income arithmetic screen produces required annual income of $74,040. The implied asking-rent-to-income relationship is 50.9%, creating the central tension: the current asking-rent index has risen while the ZIP-level income benchmark is materially lower. This screen is arithmetic only, not affordability advice, an applicant qualification rule, or a statement about any household.
The backward-looking Zillow history describes a stable-growth pattern rather than a sudden reversal. Exact same-month annualized rent changes were 5.4% over 1 year, 5.2% over 3 years, and 5.8% over 5 years. The recent direction therefore broadly confirms the longer observed path, although it does not establish what comes next. Historical coverage reaches 97.8%, supporting a relatively complete account of the recorded series. Annualized dispersion in monthly returns is 2.3%, which indicates how much monthly index changes varied around the historical path. Separately, the largest recorded peak-to-trough decline was 2.7%, showing that the index did experience retracement despite its net growth. Transparent national discovery ranks among history-eligible ZIPs were 270 for momentum, 419 for stability, and 54 for the balanced measure; lower ranks are higher. These are retrospective discovery markers, not forecasts or investment recommendations, and variability means a single current rent reading merits more confidence as an index observation than as a precise unit-level estimate.
The bedroom figures require a separate interpretation. HUD FMR/SAFMR is an administrative, bedroom-specific standard and not asking rent; its local ladder is used only to scale the ZIP ZORI into modelled estimates. The resulting monthly modelled ladder runs from $1,536 for a studio to $2,758 at the largest published size, with $1,645, $1,851, and $2,383 between those endpoints. These are modelled estimates, never measured bedroom rents, and they do not replace direct listing comparisons. The matched ACS five-year survey provides another distinct universe: its $1,187 median gross rent describes occupied renter homes and includes selected utilities. Zillow ZORI is 55.9% higher than that ACS median, a difference that should not be read as a like-for-like rent increase because the two sources observe different housing populations, timing, and rent concepts.
The matched ZCTA housing profile adds evidence of renter concentration and survey-reported cost pressure without identifying conditions at a particular property. Of 26,690 housing units, the stock includes 4,198 single-family units and 7,593 large multifamily units. Renter-occupied homes total 16,876, equal to a 74.0% renter share. There are 3,873 vacant units, producing a 14.5% vacancy rate; that aggregate count does not demonstrate availability, condition, pricing, or lease terms for any individual unit. Among renter households in the ACS burden universe, 8,524 of 16,876 reported gross rent equal to or above 30% of household income, a 50.5% share. Because this is a five-year survey measure of occupied renter homes, burden is useful as population-level context but cannot prove that a current applicant or a particular vacant unit faces the same outcome.
Wider-area comparisons place the ZIP below the surrounding asking-rent measures, while remaining context rather than substitutes for direct ZIP evidence: Chicago city context reports $2,409, Cook County context reports $2,336, and the Chicago-Naperville-Elgin, IL-IN-WI metro context reports $2,275. Each comparison has a broader geographic scope than 60637 and should be named as such when used. The ZIP-level ZORI, the ZCTA ACS results, and these city, county, and metro context values cannot be merged into a single rent series. Instead, the comparison shows that the ZIP’s current asking-rent index sits below broader reference levels even as its local income and renter-burden measures retain their separate survey-based tension.
Redfin supplies a different direct ZIP universe: a rolling-three-month for-sale/resale observation, not rental transactions or rental comparables. Median sold price was $359,419, up 20.3% year over year, with 111 homes sold and median marketing time of 69 days. Inventory was 177 homes and months of supply measured 4.8. Sale-to-list signals remained below full list price on average at 97.8%, while 24.1% of sales closed above list. This resale record challenges any attempt to equate the stable asking-rent history with a single for-sale-market condition: resale prices changed much faster than the recorded asking-rent path, yet the sale-to-list signals do not describe rental demand or resolve the ZIP’s income-and-burden tension. Annualized ZIP ZORI divided by median sold price equals 6.18%; it is only a cross-source screening ratio and has no property-specific economic or return interpretation.
Several limits constrain how far the aggregate evidence can travel. Zillow’s blended index cannot establish a particular unit’s asking rent, bedroom count, utility treatment, concession, lease term, or availability date. ACS reflects surveyed occupied renter homes with published uncertainty, whereas HUD standards are administrative benchmarks. The Redfin figures concern sold homes and active resale conditions, not rent collections or operating costs. A property-level review would therefore need direct confirmation of the address geography, legal and physical bedroom count, current advertised rent, included utilities, concessions, lease duration, and comparable listings with matching attributes. For a resale comparison, the relevant checks also include sale date, condition, listing history, and whether the observed sale resembles the property being considered.
The evidence is most useful when its tension is preserved rather than averaged away. ZIP ZORI shows a historically steady asking-rent climb and a current level below broader city, county, and metro asking-rent context, while the matched ZCTA survey shows lower income, a substantial renter presence, and widespread reported gross-rent burden. Meanwhile, the direct resale observation shows a distinct for-sale market with rising sold prices but sale-to-list and marketing measures that must remain in that separate universe. None of these series forecast rents, resale outcomes, household payment capacity, or property economics. The deciding property-level question is whether a specific unit’s verified rent, utility terms, bedroom configuration, condition, and availability actually resemble the aggregate measures used here.
","findings":[{"body":"The ZIP ZORI level is a typical observed asking-rent index, not an individual lease quote. When annualized and compared with matched-ZCTA median household income, it produces a high arithmetic rent-to-income screen. That contrast is decision-relevant, but it does not determine whether any renter qualifies, receives a concession, shares housing costs, or pays a particular amount.","title":"Current asking rent creates an income-screen tension"},{"body":"Same-month Zillow history shows closely grouped one-, three-, and five-year annualized growth rates. Monthly-return variability and the maximum drawdown indicate that the series had fluctuations and a recorded decline even while its longer path rose. The disclosed coverage and national discovery ranks improve transparency about the historical record, not confidence in a future rent outcome.","title":"The recorded rent path is steady but not predictive"},{"body":"The matched ZCTA has a renter-heavy occupied stock, a meaningful aggregate vacancy rate, and more than half of renter households reporting gross-rent burdens at or above the stated threshold. Those ACS measures describe surveyed occupied homes and aggregate vacant stock. They cannot establish that a currently marketed unit is vacant, affordable, habitable, or burdened in the same way.","title":"Survey burden and vacancy describe populations, not units"},{"body":"Redfin’s rolling resale observation shows sold-price growth, measurable transaction volume, inventory, marketing time, supply, and mixed sale-to-list signals. It is direct ZIP evidence for the for-sale market only. Dividing annualized ZORI by median sold price can screen cross-source relationships, but it excludes expenses, property condition, financing, and lease information and cannot describe property-specific economics.","title":"Resale evidence is a separate screening universe"}],"risks":["ZCTA boundaries are statistical constructs and do not exactly reproduce USPS delivery ZIP boundaries, so address-level eligibility, listing geography, and any unit-specific comparison require direct confirmation rather than assumed geographic equivalence.","The gap between Zillow asking-rent index values and ACS median gross rent can reflect different timing, housing populations, utilities, and occupancy status; treating that gap as a measured rent increase would overstate precision.","Aggregate vacancy, renter burden, and housing-stock counts do not reveal condition, lease concessions, utility obligations, legal bedroom count, or actual availability at a specific property, so they cannot substitute for unit documentation.","The resale screening ratio combines asking-rent and sold-price sources with different transaction concepts and excludes operating costs, taxes, maintenance, financing, and property condition, making it unsuitable for property-specific economic conclusions."],"qa":[{"a":"Zillow ZORI is a current typical observed asking-rent index blended across rental types. ACS median gross rent is a five-year survey measure of occupied renter homes and includes selected utilities. Their difference compares unlike universes, including different timing and occupancy conditions, so it is a source-scope contrast rather than a measured lease-to-lease increase.","q":"Why is Zillow ZORI higher than the ACS median gross rent without proving that rents increased by that amount?"},{"a":"No. The bedroom figures are modelled monthly ZIP estimates derived by scaling the ZIP ZORI with the local HUD bedroom ladder. HUD FMR/SAFMR is an administrative standard, not asking rent. The estimates are useful for proportional screening, but direct comparable listings remain necessary to establish an actual bedroom-specific asking rent.","q":"Are the bedroom rent figures observed rents for studios and larger apartments?"},{"a":"No. The calculation simply annualizes the ZIP asking-rent index and divides it by the stated share of income. It is an arithmetic comparison against the matched-ZCTA income benchmark. It is not financial advice, a landlord policy, an applicant qualification rule, or evidence of a particular household’s budget.","q":"Does the 30% required-income calculation determine whether a household can rent a unit?"},{"a":"Redfin should remain a direct ZIP for-sale observation with its own sold prices, transaction count, marketing time, inventory, supply, and sale-to-list signals. It can reveal whether resale movement differs from the asking-rent record, but it cannot function as rental comparable evidence. The combined rent-price figure is only a cross-source screening ratio, not a property-level economic measure.","q":"How should the Redfin resale data be used alongside the rental evidence?"}],"sources":[{"key":"apartment_list_time_on_market","name":"Apartment List Time on Market — listing liquidity","release":"Apartment List 2026-07","pulledAt":"2026-08-08","url":"https://www.apartmentlist.com/research/category/data-rent-estimates"},{"key":"apartment_list_vacancy","name":"Apartment List Vacancy Index — rental vacancy","release":"Apartment List 2026-07","pulledAt":"2026-08-08","url":"https://www.apartmentlist.com/research/apartment-list-vacancy-index-methodology"},{"key":"census_zcta_facts","name":"Census ACS five-year — ZCTA housing and income","release":"ACS 2024 5-year ZCTA","pulledAt":"2026-08-08","url":"https://api.census.gov/data/2024/acs/acs5.html"},{"key":"hud_zip","name":"HUD USPS crosswalk and Small Area FMRs — ZIP rent fallback","release":"ZIP-CBSA 2025Q4 + SAFMR 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