ZIP 85257 presents a useful tension between a modestly rising asking-rent index and a resale market whose price signal is positive but whose transaction conditions look more measured. Zillow’s typical observed asking-rent index, blended across rental types, was $1,958 in June 2026, up 2.2% from the same month a year earlier. Redfin’s direct rolling-three-month ZIP resale observation reported a $599,864 median sold price, up 3.0% year over year. Annualized ZIP ZORI divided by that sale price equals 3.92%, but this is a cross-source screening ratio only, not a cap rate, property yield, net return, or expected return.
The 85257 label is both Zillow’s ZIP market identifier and the matched Census ZCTA; a ZCTA is a statistical area and is not identical to a USPS delivery ZIP. Zillow ZORI measures asking-rent conditions, whereas the ACS 2024 five-year survey’s $1,849 median gross rent describes occupied renter homes and includes selected utilities. Across wider geographies, Scottsdale city context rent was $2,173, Maricopa County context rent was $1,729, and Phoenix-Mesa-Chandler, AZ metro context rent was $1,733. Those city, county, and metro figures are context rather than substitutes for ZIP-level asking-rent evidence.
The historical record supports a stable-growth reading, with important pacing differences. Same-month Zillow ZORI change was 2.19% annualized over one year, 0.52% over three years, and 3.98% over five years. Thus, the latest positive direction confirms the longer upward path rather than reversing it, but it is stronger than the subdued three-year pace and below the five-year rate. Annualized monthly-return variability was 2.85%, suggesting that a single current rent snapshot deserves measured confidence rather than being treated as a fixed market clearing level. The largest observed drawdown was 2.49%, a limited backward-looking setback. Coverage was 100% across 123 observations and 122 consecutive monthly returns. Transparent national discovery ranks were 1,754 for momentum, 1,339 for stability, and 1,735 for the balanced score, with lower ranks higher among history-eligible ZIPs. These measurements are historical, not forecasts or investment recommendations.
Redfin’s resale evidence is strictly for-sale evidence, not rental transaction data. In its direct rolling-three-month ZIP observation, 131 homes sold with a median marketing time of 60 days. Redfin reported 369 active listings, inventory of 213 homes, and 4.9 months of supply, above the Phoenix-Mesa-Chandler, AZ metro context’s 3.5 months. Average sale-to-list was 96.8%, while 6.3% of sales closed above list. Rising median sold price therefore confirms that the ZIP’s resale price measure moved higher, yet supply, marketing time, and below-list average execution challenge any simple reading of uniformly tight resale conditions. That resale tension also tempers the otherwise positive recent rent-history signal without establishing a causal relationship.
Bedroom figures should be read as modelled estimates, not measured bedroom rents. Scaling ZIP ZORI through the local HUD ladder produces modelled monthly estimates of $1,552 for a studio, $1,690 for one bedroom, $1,958 for two bedrooms, $2,614 for three bedrooms, and $2,900 for four bedrooms. The local HUD FMR/SAFMR ladder is an administrative, bedroom-specific standard rather than asking rent. Its two-bedroom standard was $2,120, placing the modelled two-bedroom estimate at 92.4% of that benchmark. The match between the modelled two-bedroom figure and ZIP ZORI follows the scaling method; it does not validate a measured two-bedroom market rent.
The income screen is less strained than the burden survey, creating another decision tension. At a 30% rent-to-income arithmetic screen, the $1,958 monthly asking-rent index corresponds to required annual income of $78,320. The ACS median household income was $86,962, and the implied asking-rent-to-income screen was 27.0%. This is arithmetic only, not advice, an applicant qualification rule, or a claim about what any household can pay. In the ACS five-year survey of occupied renter homes, 42.2% of renter households were rent burdened at 30% or more of income. That broader burden measure includes households, rent situations, and utility treatment that differ from Zillow’s asking-rent index, so it cannot prove affordability or burden for a particular available unit.
Housing-stock evidence provides a broad availability backdrop but not a unit-level vacancy conclusion. The matched ACS ZCTA counted 16,785 housing units and an overall vacancy rate of 11.2%. Renters were a minority of occupied households, while 223 vacant units were classified as for rent and seasonal vacancies outnumbered vacant-for-rent homes. Overall vacancy combines multiple categories and does not identify the condition, rent, bedroom count, lease timing, or readiness of an individual home. Similarly, a vacancy measure from the ACS five-year survey should not be treated as current leasing inventory or as proof that concessions are available.
The evidence is strongest when each source is kept in its own universe: Zillow for ZIP asking-rent indexing, ACS for surveyed occupied renter households and housing stock, HUD for administrative bedroom standards, and Redfin for direct ZIP resale conditions. Important limits remain around property type, bedroom mix, utilities, concessions, condition, listing availability, and timing. Concrete property-level checks should verify the advertised bedroom count, current asking amount, lease start date, included utilities, concessions, active status, and comparable nearby listings; resale review should separately verify sale dates, list prices, and property similarity. The unresolved question is whether a specific available unit matches the modelled bedroom frame and current asking-rent snapshot closely enough to make the broader ZIP evidence relevant.
","findings":[{"body":"ZIP ZORI increased 2.19% over the latest same-month year, well above the 0.52% three-year annualized pace but below the 3.98% five-year annualized pace. That pattern supports positive recent direction while showing that the growth path has not been uniform. Full historical coverage improves confidence in the measurement record, not in a future outcome.","title":"Recent rent growth confirms, but does not fully match, the longer history"},{"body":"Redfin reported a higher ZIP median sold price year over year, but resale conditions also included 4.9 months of supply, 60 median days on market, a 96.8% average sale-to-list ratio, and only 6.3% of sales above list. These are direct for-sale observations and should be read as resale-market signals, not rental comparables or property-level economics.","title":"Resale appreciation is paired with more measured liquidity signals"},{"body":"The modelled two-bedroom estimate equals the ZIP ZORI level because the bedroom series is mechanically scaled from that index using the local HUD ladder. It sits at 92.4% of the HUD two-bedroom standard. HUD FMR/SAFMR is an administrative benchmark, however, and neither figure is a measured rent for a particular two-bedroom listing.","title":"Modelled bedroom estimates are below the HUD two-bedroom standard"},{"body":"The 30% screen implies required annual income below the ACS median household income, yet 42.2% of ACS renter households were burdened at 30% or more of income. The difference is meaningful because the first calculation uses a current asking-rent index, while the ACS result is a five-year survey measure for occupied renter homes that includes selected utilities.","title":"Income-screen arithmetic and renter burden point to different populations"}],"risks":["Zillow ZORI is a blended typical asking-rent index across rental types, so it may not match the size, condition, lease terms, concessions, or included utilities of an individual available property.","ACS ZCTA results are five-year survey estimates for a statistical area rather than a USPS delivery ZIP, and they describe occupied renter homes rather than current listings or newly signed leases.","HUD FMR/SAFMR values are administrative bedroom-specific standards, not observed asking rents. The bedroom figures shown here are modelled from ZIP ZORI and should not be treated as measured unit rents.","Redfin’s figures describe direct ZIP resale activity over a rolling three-month period. Median sold price and the rent-price screening ratio do not establish financing costs, expenses, net economics, or future resale outcomes."],"qa":[{"a":"They answer different questions and use different universes. Zillow ZORI is a current ZIP-level typical observed asking-rent index blended across rental types. ACS median gross rent is a five-year survey estimate for occupied renter homes and includes selected utilities. A difference between them does not identify an error or a specific unit’s rent.","q":"Why does the ACS median gross rent differ from Zillow ZORI?"},{"a":"No. They are modelled monthly ZIP estimates created by scaling the overall ZIP ZORI using the local HUD bedroom ladder. They provide a consistent bedroom framework, but they are not measured rents from bedroom-specific listing samples and should not replace verification of actual active listings.","q":"Are the bedroom rent figures observed rents for 85257?"},{"a":"It is a simple arithmetic screen: annualized asking rent divided by 30% produces an income amount associated with that ratio. It is not affordability advice, an applicant qualification standard, or evidence that a household with higher or lower income can or cannot afford a particular unit.","q":"What does the 30% required-income figure mean?"},{"a":"It should remain separate. Redfin measures ZIP for-sale transactions and market liquidity, while Zillow measures asking-rent conditions. The positive resale price change and more measured sale-to-list and supply signals create useful context, but they do not establish rental demand, leasing outcomes, or property-level investment economics.","q":"How should the resale data affect interpretation of the rent data?"}],"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 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