June 2026 brings the central tension in 94501 into focus: Zillow’s ZIP-level ZORI is $2,928 per month, and the exact same-month gain is 5.68% from a year earlier. That one-year advance exceeds the 2.06% annualized change over three years and the 2.78% annualized change over five years, so the latest direction confirms a rising longer path while moving faster than that longer-run pace. ZORI is a typical observed asking-rent index blended across rental types, rather than the price of a specified available home. The five-digit 94501 label is both Zillow’s ZIP market identifier and the Census ZCTA match; a ZCTA is a statistical area and is not identical to a USPS delivery ZIP.
History puts that acceleration in a measured, backward-looking frame. The series contains 122 monthly observations and has 100% coverage through the stated endpoint. Annualized monthly-return variability is 2.27%, and maximum drawdown is -2.82%; those figures quantify the path’s movement rather than guarantee that an individual current listing will track the index. They support cautious confidence in one current ZORI snapshot as a series summary, while leaving no basis to treat it as a unit quote. The transparent national discovery ranks among history-eligible ZIPs are 776 for momentum, 376 for stability, and 229 for the balanced measure, where lower is higher. These are historical measurements, not forecasts or investment recommendations.
Source definitions explain why the ZIP index should not be collapsed into a survey median. The matched Census ZCTA’s ACS 2024 five-year survey covers occupied renter homes: its median gross rent is $2,437, with a published $61 margin of error, and gross rent includes selected utilities. The current ZORI is 20.15% above that survey median. That gap can arise from unlike time windows, sampled occupied homes versus observed asking rents, and utility treatment; it is not a like-for-like quote comparison. ACS reports median household income of $127,906. Annualizing the ZIP asking index yields $117,120 at a 30% required-income screen, equal to 27.47% of that median income. The screen is arithmetic only, not advice or an applicant qualification rule.
ACS burden results bring a different affordability signal, but they remain aggregate. The ZCTA has 6,237 renter households reporting gross-rent burdens at or above 30%, a 44.16% share of renter households in the survey. This is not proof that a particular vacant home is unaffordable, or that a particular applicant is burdened. For bedroom sizing, the modelled monthly ZIP estimates scale ZORI through the local HUD ladder: $2,019 for a studio, $2,419 for one bedroom, $2,928 for two bedrooms, $3,740 for three bedrooms, and $3,877 for four bedrooms. They are modelled estimates, never measured bedroom rents. The FY2026 HUD FMR/SAFMR two-bedroom standard is $3,604; it is an administrative bedroom-specific standard, not asking rent.
Housing counts show a mixed tenure and structure base rather than a listing inventory. The ACS ZCTA reports 27,300 housing units and a 7.66% all-housing vacancy rate; 944 units are classified as vacant for rent. Renter-occupied homes account for a 56.03% share of occupied homes. The stock includes 13,132 single-family units and 6,602 units in large multifamily structures, with other structure categories not detailed here. These are area-level counts, not evidence that a specific unit is currently marketed, immediately available, in comparable condition, or offered at the ZIP index. Vacancy and burden therefore cannot establish terms or affordability for an individual property.
Broader comparisons are reference points only. Within the Alameda city context, the context rent is about $2,948; within the Alameda County context, it is $2,895; and within the San Francisco-Oakland-Berkeley, CA metro context, it is $3,301. The ZIP-level asking-rent index therefore lies between the named city and county context readings but below the named metro context reading. These are wider geographies rather than substitutes for this ZIP, and their city, county, and metro measures must not be blended with the ZIP ZORI, ACS ZCTA survey, HUD standard, or one another. A comparison can frame scale, but it neither prices a property nor establishes a local outcome.
Several limits remain material. The Zillow measure is a ZIP asking-rent index, the ACS measure is a multi-year survey of occupied renter homes with selected utilities, and the HUD figure is an administrative standard; their periods and universes do not form a synchronized property-level dataset. Property-level resolution would require checking the dated advertised rent, precisely defined bedroom count and property type, included utilities, active availability, lease length, concessions, deposits, recurring fees, and application rules. Those checks can show whether an advertised home matches the index category and modelled ladder without treating either as a quote. Does the particular listing’s dated, all-in monthly obligation actually match the comparison being made?
","findings":[{"body":"At the June 2026 endpoint, the ZIP’s $2,928 ZORI is 5.68% above the same month a year before. That exceeds its 2.06% three-year and 2.78% five-year annualized gains. With 122 observations and complete reported coverage, the record supports an acceleration description, but it remains a backward-looking asking-rent index rather than a forecast, quote, or recommendation.","title":"Acceleration is the current signal"},{"body":"ZORI, ACS, and HUD use different universes. ZORI represents a typical observed ZIP asking-rent index across rental types. ACS reports a five-year median gross rent for occupied renter homes and includes selected utilities; its ZCTA is a statistical geography, not a USPS delivery ZIP. HUD FMR/SAFMR values are administrative bedroom standards. The reported gaps therefore are comparisons, not interchangeable prices.","title":"Three rent concepts answer different questions"},{"body":"The listed studio-through-four-bedroom figures are modelled ZIP estimates created by scaling the overall ZORI with the local HUD bedroom ladder. They do not measure current bedroom-specific asking rents. The two-bedroom model equals the overall $2,928 index, while the $3,604 HUD standard has an administrative role. Checking an actual listing’s bedroom count, property type, utilities, terms, and date is necessary before making a unit-level comparison.","title":"The bedroom ladder is a model, not observed rent"},{"body":"ACS shows a 7.66% all-housing vacancy rate and a 44.16% share of renter households reporting gross-rent burden at or above 30%. These describe the matched ZCTA population, not a given available home or applicant. Alameda city, Alameda County, and the San Francisco-Oakland-Berkeley metro are wider contexts only; their rent readings can frame geography but cannot replace the ZIP index or establish individual availability.","title":"Aggregate housing measures set boundaries"}],"risks":["The Zillow endpoint, ACS five-year survey, and HUD fiscal-year standard use different timeframes and populations. Treating their dollar figures as same-date unit quotes can misstate a property-level relationship and hide utility-treatment differences.","Bedroom amounts are derived by applying a HUD ladder to the overall ZIP index. A property’s actual bedroom rent can differ because the model does not observe that listing’s terms, condition, utilities, or availability.","Vacancy and burden are aggregate ZCTA measures with survey uncertainty and category limits. They cannot show that a specific vacant dwelling is market-ready, affordable to a particular household, or offered at the displayed index.","The history has defined coverage and ranks, but past monthly behavior does not predict future asking rents. The accelerating designation does not establish cause, duration, future performance, or investment results."],"qa":[{"a":"At the June 2026 endpoint, the $2,928 figure is Zillow ZORI for the ZIP market identifier. It is a typical observed asking-rent index blended across rental types. It does not state the asking price, availability, bedroom count, utilities, or lease terms for a particular dwelling.","q":"What does the current ZIP rent figure measure?"},{"a":"ACS and Zillow are not measuring the same rental universe or period. ACS is a five-year survey of occupied renter homes, and its median gross rent includes selected utilities. Zillow ZORI summarizes observed asking rents across rental types. The difference should be treated as a source-definition and timing comparison, not evidence that a specific unit is underpriced, overpriced, or comparable.","q":"Why is ACS gross rent lower than ZORI?"},{"a":"No. The studio through four-bedroom amounts are modelled estimates: the ZIP-wide ZORI is scaled by the local HUD bedroom ladder. HUD FMR/SAFMR is an administrative standard, not asking rent. The output provides a consistent sizing framework, but it cannot substitute for a dated property advertisement, defined bedroom count, utility treatment, or lease terms.","q":"Are the bedroom values observed rents?"},{"a":"Compare the advertisement’s date and monthly rent with the index endpoint, then confirm bedroom count, property type, utilities, active availability, lease duration, concessions, deposits, recurring fees, and application rules. Also keep the ZIP market identifier distinct from the Census ZCTA. These checks prevent aggregate burden, vacancy, and context statistics from being treated as facts about that individual home.","q":"What property-level checks resolve the main uncertainty?"}],"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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