Cooling, rather than a fresh growth leg, is the central historical tension in ZIP 78233. Zillow’s current ZIP ZORI is $1,288, a typical observed asking-rent index blended across rental types, after a 4.8% same-month decline over 1 year. The annualized same-month change is also negative over 3 years, at a 2.4% annualized decline, whereas the 5-year measure remains a 1.5% gain. Recent direction therefore breaks from, rather than confirms, the longer path. Monthly index-return variability annualizes to 2.4%, a relatively contained pattern that still limits confidence in treating a single current reading as definitive. The 7.7% maximum drawdown captures a materially deeper historical retreat. Complete monthly coverage makes this backward-looking record interpretable, not a forecast or investment recommendation. It also does not indicate that every available unit moved by the same amount, because ZORI is an index rather than a lease ledger.
The 78233 label 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. The matched 2024 ACS 5-year survey reports a $1,514 median gross rent for occupied renter homes, a measure that includes selected utilities; it is not Zillow’s asking-rent index and should not be treated as a contradiction. As wider-context rent figures, San Antonio city is about $1,382, Bexar County is $1,389, and the San Antonio-New Braunfels, TX metro is $1,416. Those city, county, and metro values are context only: they use wider geographies, cannot replace direct ZIP evidence, and do not establish a comparable asking rent for a particular property.
The bedroom view is a scaling model, not a measured set of bedroom rents. Modelled monthly ZIP estimates are $972 for a studio, $1,059 for a one-bedroom, the current ZORI baseline for a two-bedroom, $1,651 for a three-bedroom, and $1,928 for a four-bedroom. They are produced by scaling ZIP ZORI with the local HUD bedroom ladder. The corresponding HUD FMR/SAFMR administrative standards are $1,230, $1,340, $1,630, $2,090, and $2,440. HUD’s bedroom-specific standards are program benchmarks rather than asking rents, signed-lease rents, or evidence that an available unit is priced at those levels. The wider spread in the upper-bedroom model reflects the HUD ladder’s structure, not direct observation of larger-unit listings in this ZIP.
At a 30% required-income screen, a $1,288 monthly asking-rent index converts arithmetically to $51,520 of annual income. That amount is below the matched ZCTA’s $76,421 median household income, but this is a comparison of a rental index with a survey-wide household-income statistic, not an applicant qualification rule or affordability advice. The burden evidence adds an important counterweight: 3,267 of 7,509 renter households, or 43.5%, reported gross-rent burdens at or above the screen. ACS burden measures describe surveyed occupied renter homes and cannot prove the financial position, utilities, lease terms, or rent burden of any particular unit. Still, the coexistence of the median-income screen and the burden share argues against reading one aggregate affordability measure in isolation.
The same ACS ZCTA survey records 19,859 housing units, including 18,970 occupied units and 889 vacant units, for a 4.5% vacancy rate. Its stock count includes 14,176 single-family units, showing that the ZIP’s housing inventory is not represented solely by the rental index. These are area-level survey counts with margins of error, not a live availability file. Vacancy does not identify the condition, location, bedroom count, concession terms, or market rent of an individual home. Likewise, the existence of vacant housing does not establish that a particular renter can access it. This stock snapshot is most useful as context for interpreting aggregate tenure and availability conditions alongside, rather than inside, Zillow’s observed asking-rent universe.
The direct for-sale evidence shows a separate form of cooling. In Redfin’s rolling-three-month ZIP resale observation, the median sold price was $246,944, down 6.8% year over year. There were 114 homes sold, median marketing time was 73 days, inventory was 238 homes, and months of supply stood at 6.3. Sale-to-list signals were also subdued: the average sale-to-list ratio was 97.1%, while 8.1% of homes sold above list. These are ZIP resale observations, not rental transactions, asking-rent comparables, or estimates of property operating economics. They describe transaction pace, pricing, and listing-market balance in the for-sale universe only, and should remain separate from the ZORI and ACS evidence.
The annualized ZIP ZORI divided by the Redfin median sold price produces a 6.26% cross-source screening ratio. It is not a cap rate, net return, expected return, property yield, or a substitute for property-level costs. The resale price decline confirms the directional cooling visible in recent asking-rent history, while the supply and sale-to-list readings provide a distinct resale-market context for that same broad tension. They do not, however, convert the median-income screen into proof of low renter burden. Transparent national history-eligible ZIP discovery ranks place momentum at 2,892, stability at 527, and the balanced measure at 2,299; lower ranks are higher. These ranks summarize backward-looking measurements for discovery and do not predict future rents, prices, or investment outcomes.
Several limits remain material. Zillow ZORI is a blended asking-rent index, ACS is a multi-year survey of occupied homes with selected utilities in gross rent, HUD is an administrative standard, and Redfin is a rolling resale observation. Their dates, populations, and definitions differ. A property-level review would need to verify the actual advertised rent, included utilities, bedroom count, lease length, concessions, availability date, condition, and any changes since listing. On the resale side, it would need the specific sale record, list-price history, days on market, physical condition, and costs not contained in the screening ratio. No aggregate vacancy, burden, price, or rent statistic can resolve those unit facts. The open factual question is whether a specific current listing aligns with the index, modelled bedroom range, and the separate resale evidence.