The central measured tension in 78717 is a declining asking-rent path alongside an appreciating resale median. Zillow’s ZIP asking-rent index stood at $1,660 in June 2026, while exact same-month history recorded a 1.2% one-year decline, a 4.1% annualized three-year decline, and a 0.7% annualized five-year decline. Recent direction therefore confirms rather than breaks from the longer weak rent path, with the three-year result showing the sharpest contraction. These are backward-looking rent measurements, not forecasts, investment recommendations, or evidence that every available listing is being repriced in the same way.
History coverage is strong but does not make a single current reading frictionless to interpret: 99.2% coverage produced 123 observations and 121 consecutive monthly returns. Annualized monthly-return variability was 3.1%, meaning the index has moved enough over time that a reader should place moderate, rather than absolute, confidence in one current rent snapshot. Separately, the maximum drawdown reached 16.2%, documenting the size of the largest historical retreat. Transparent national discovery ranks among history-eligible ZIPs were 2,760 for momentum, 1,804 for stability, and 2,703 for the balanced measure, where a lower rank is higher. Those ranks organize past-data discovery only; they do not predict rent performance.
The $1,660 figure is Zillow ZORI, a typical observed asking-rent index blended across rental types, rather than a survey median of occupied homes. The five-digit label 78717 is both Zillow’s ZIP market identifier and a Census ZCTA match; a ZCTA is a statistical area and is not identical to a USPS delivery ZIP. In the matched ACS 2024 five-year survey, median gross rent was $1,867 with a $69 margin of error. That occupied-renter-home measure includes selected utilities and sits 11.1% above ZORI, so the two values should not be treated as competing quotes for the same unit. ACS median household income was $145,325; annualizing current ZORI equals 13.7% of that figure. The $66,400 income associated with a 30% rent screen is arithmetic only, not advice or an applicant qualification rule.
Bedroom figures add useful structure without creating measured bedroom rents. Scaling ZIP ZORI by the local HUD ladder produces modelled monthly estimates of $1,321 for a studio, $1,400 for one bedroom, $1,660 for two bedrooms, $2,104 for three bedrooms, and $2,474 for four bedrooms. These are modelled estimates, not observed asking rents or transaction rents. HUD FMR/SAFMR is an administrative, bedroom-specific standard rather than asking rent; its local two-bedroom standard is $1,852. The ladder is useful for showing relative bedroom steps, but unit condition, lease terms, utilities, availability, and concessions can all make a specific listing differ from the modelled range.
The ACS ZCTA housing base contained 15,361 units, with a 2.7% overall vacancy rate and renters accounting for 48.7% of occupied homes. Of the vacant inventory, 322 units were classified as vacant for rent. The stock mix included 8,835 single-family units and 3,164 units in large multifamily structures, indicating that neither building form alone represents the full housing base. ACS also reports that 40.5% of renter households faced rent burden at or above the standard threshold. That burden result is a household-survey measure, not proof that a particular vacant unit is unaffordable, improperly priced, or likely to remain available.
Wider geography provides context, not substitutes for ZIP evidence: Austin city context rent was $1,614.53 with a 5.6% vacancy rate; Williamson County context rent was $1,685; and Austin-Round Rock-Georgetown metro context rent was $1,653 with a 9.5% apartment vacancy rate. ZIP ZORI is therefore near the metro context but below the county context, while the ZIP’s overall vacancy rate is below the city and metro vacancy measures. These comparisons require caution because their geographic scopes and, for the metro apartment vacancy figure, their housing-universe definition differ from the direct ZIP asking-rent index and the ACS ZCTA household survey.
Redfin’s direct rolling-three-month ZIP resale observation describes the for-sale market, not rental transactions. Its median sold price was $659,851, up 5.6% year over year; 87 homes sold and median marketing time was 41 days. Inventory was 143 homes, equal to 5.0 months of supply. Sale-to-list signals remained below a fully at-list outcome on average: the average sale-to-list ratio was 98.0%, and 13.0% of sales closed above list. This resale evidence challenges a simple reading of the rent history: sales pricing increased even as Zillow’s asking-rent index declined. Annualized ZIP ZORI divided by the median sold price equals a 3.0% cross-source screening ratio only, not a cap rate, net return, expected return, or property yield.
The data support comparison, not property-level conclusions. Check the current asking rent, bedroom count, lease length, included utilities, concessions, fees, availability date, and whether the listing’s property type matches the blended ZORI universe. For resale review, verify the actual sale date, physical condition, lot and building characteristics, financing or seller concessions, and the relevant list-price history rather than applying the ZIP median to an individual home. Reconcile any unit-level rent quote with the distinction between ZORI, ACS gross rent, HUD standards, and Redfin resale evidence before drawing a conclusion from the current snapshot.
","findings":[{"body":"The current Zillow asking-rent index is below its exact same-month level across the one-year, three-year, and five-year lookbacks. The three-year annualized decline is materially steeper than the five-year decline, so recent weakness confirms the broader historical path. Strong observation coverage helps document that pattern, but measured variability and the historical drawdown limit confidence in treating one monthly index value as definitive.","title":"Rent history remains the primary caution signal"},{"body":"Zillow ZORI is a blended typical asking-rent index, while ACS median gross rent measures occupied renter homes and includes selected utilities. HUD bedroom standards are administrative benchmarks, not asking-rent observations. The gap between ZORI and ACS gross rent is therefore a source-universe distinction as much as a price comparison. Modelled bedroom estimates provide a consistent scaling tool, but they are not replacements for current unit-level quotes.","title":"Rent measures answer different questions"},{"body":"Annualized ZORI is a relatively small share of ACS median household income, and the arithmetic income screen is well below that median. Yet a substantial ACS share of renter households reports burden at or above the standard threshold. Those results can coexist because household income, household size, housing costs, utility inclusion, tenure, and rent paid vary across the occupied renter population. Neither measure describes a specific applicant or vacant unit.","title":"Household burden and headline income point in different directions"},{"body":"Redfin’s direct ZIP resale evidence shows a higher median sold price year over year despite the declining asking-rent history. Sales volume, marketing time, supply, and sale-to-list data describe for-sale liquidity and pricing behavior only. They are not rental comps or operating statements. The annualized-rent-to-sold-price calculation is useful only as a cross-source screening ratio, so it should not be interpreted as a property-level economic return measure.","title":"Resale data complicates the rent-only reading"}],"risks":["The Zillow index is blended across rental types and can differ from a particular listing because of bedroom count, structure type, lease terms, included utilities, concessions, timing, and available inventory.","ACS results describe occupied renter households in a matched statistical area over a five-year survey period, so they cannot establish the current price, affordability, or burden of a specific available rental.","Redfin resale indicators concern homes sold and listed in the for-sale market. Rising sold prices do not establish rising rents, tenant demand, property income, transaction economics, or outcomes for rental housing.","Historical declines, variability, and drawdown are retrospective measurements. They show that the rent index has changed materially, but they do not determine future rent direction, lease renewal terms, or individual-unit pricing."],"qa":[{"a":"The measures use different universes. Zillow ZORI is a typical observed asking-rent index blended across rental types, while ACS median gross rent is a survey measure for occupied renter homes and includes selected utilities. The ACS result also represents a five-year survey period in the matched ZCTA, rather than a current asking-rent snapshot.","q":"Why is ACS median gross rent higher than Zillow ZORI?"},{"a":"No. The studio through four-bedroom figures are modelled monthly estimates created by scaling the ZIP Zillow asking-rent index with the local HUD bedroom ladder. They illustrate relative bedroom steps, but they are not measured asking rents, signed leases, rental transactions, or guarantees of a listing’s available price.","q":"Are the bedroom rent figures observed ZIP rents?"},{"a":"It is a cross-market tension, not a contradiction that can be resolved with one metric. Zillow history describes asking-rent movement, whereas Redfin reports direct ZIP for-sale resale activity. A higher median sold price can coexist with lower asking-rent index readings because the data measure different transactions, populations, timing, and market signals.","q":"How should the resale increase be read alongside declining rents?"},{"a":"Verify the unit’s current asking rent, bedroom count, property type, lease duration, concessions, fees, included utilities, availability date, and condition. For a sale comparison, verify sale date, list-price history, physical characteristics, seller concessions, and financing terms. Then keep ZORI, ACS gross rent, HUD standards, and Redfin resale observations in their separate evidence universes.","q":"What property-level checks matter before using these ZIP figures?"}],"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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