ZIP 78257’s June 2026 Zillow Observed Rent Index is $1,353 per month, down 1.1% from the same month a year earlier. This is a ZIP-level typical observed asking-rent index blended across rental types, rather than a quote for a particular available home. The five-digit label is both Zillow’s ZIP market identifier and the corresponding Census ZCTA match; a ZCTA is a statistical area, not identical to a USPS delivery ZIP. That matching convention supports comparison, but it does not make the various rent sources interchangeable. The immediate signal is a modest decline in the current asking-rent index, so interpretation of the level should begin with its rental-mix scope and its difference from household-survey and administrative standards.
The decline is consistent with the longer backward-looking ZORI path rather than a break from it. Exact same-month changes were negative by 1.1% over one year, 2.3% annually over three years, and 0.4% annually over five years. Monthly rent movements showed 3.2% annualized variability, which means one current index reading should be treated as a useful benchmark but not as an unusually precise fixed price. Separately, the history’s largest peak-to-trough drawdown was 11.1%, showing that the observed index has experienced a more meaningful retreat than the latest year alone conveys. Coverage was 100%. Transparent national discovery ranks among history-eligible ZIPs were 2,724 for momentum, 1,928 for stability, and 2,726 for the balanced measure, where a lower rank is higher. These are descriptive discovery measures, not forecasts or investment recommendations.
The matched Census ZCTA’s ACS five-year survey reports median gross rent of $1,689, with a $95 margin of error. ACS median gross rent describes occupied renter homes and includes selected utilities, so it is neither a current asking-rent series nor a direct substitute for ZORI. HUD’s local two-bedroom fair-market-rent standard is $1,840; it is an administrative bedroom-specific standard, not asking rent. Scaling ZIP ZORI through the local HUD bedroom ladder produces modelled monthly estimates of $1,022 for a studio, $1,118 for one bedroom, $1,353 for two bedrooms, $1,735 for three bedrooms, and $2,022 for four bedrooms. Those are modelled estimates, never measured bedroom rents, and should not be read as listings or lease transactions.
The income and burden screen presents a separate tension. Median household income in the ZCTA is $81,301, while annualizing the current index at the 30% screen produces required income of $54,120 and an asking-rent-to-income ratio of 20.0%. That screen is arithmetic, not advice and not an applicant qualification rule. In the ACS renter-home universe, 3,637 renter-occupied households are counted, with 1,356 reporting gross-rent burdens at or above 30%, or 37.3%. Housing inventory in the ZCTA totals 6,867 units, including 1,151 vacant units, for a 16.8% vacancy rate; renters represent 63.6% of occupied homes, and 3,469 units are in large multifamily structures. Neither the burden measure nor vacancy establishes the affordability, availability, or terms of any particular unit.
Wider-context figures point in a different direction from the ZCTA’s relatively high income and lower burden share. For wider context only, the City of San Antonio context rent is $1,382, Bexar County context rent is $1,389, and the San Antonio-New Braunfels, TX metro context rent is $1,416. Each exceeds the ZIP asking-rent index, though these city, county, and metro figures are not ZIP rental comps. The ZIP’s renter share and vacancy rate also exceed the reported city and county context rates, while its rent-burden share is below both wider geographies. The comparison helps frame the ZIP’s current rental snapshot, but it cannot explain an individual building’s leasing conditions because the geographic scopes and underlying rental mixes differ.
Redfin’s direct rolling-three-month ZIP resale observation describes a for-sale market, not rental transactions. Median sold price was $884,800, up 2.0% year over year, with 50 homes sold and a median 74 days on market. Reported resale inventory was 111 homes and months of supply stood at 6.7. Sale-to-list evidence was below list on average at 97.5%, while 4.1% of sales closed above list and 41.1% went off market within two weeks. Taken together, the resale data show a higher-priced ownership market with measured marketing time and supply, even as the median sold price was above its prior-year level. These signals must remain in the resale universe and cannot be used as rental comparables or evidence of a unit’s lease economics.
Annualized ZIP ZORI divided by the ZIP median sold price equals a 1.83% cross-source screening ratio. It is not a cap rate, net return, expected return, or property yield. The core tension is that asking rent has cooled across the reported historical intervals while the direct resale median price increased, yet resale supply and sale-to-list signals do not show uniformly tight buyer conditions. The low screening ratio reinforces the scale difference between current rent and sold-price benchmarks, while the ZCTA income screen and lower burden share give a different household-level view. None of these cross-source comparisons resolves operating costs, financing, taxes, condition, concessions, or the rent achievable by a specific property.
Important limits remain: ZORI is a blended asking-rent index, ACS is a lagged survey of occupied renter homes, HUD is an administrative standard, and Redfin reports rolling ZIP resale observations. Their reporting periods, populations, and definitions differ. Concrete property-level checks should therefore separate current address-level asking rents from signed-lease terms, verify bedroom count and included utilities, identify concessions and lease duration, and distinguish active availability from vacant units in the survey. For resale comparison, review recent closed sales, listing histories, property condition, and sale terms for genuinely comparable homes. Does the specific property’s current rent, unit configuration, and recent transaction evidence support the broad ZIP signals without assuming that any one metric applies directly to it?