Cooling is the central current signal in 02124. At the June 2026 Zillow endpoint, the ZIP-level ZORI—a typical observed asking-rent index blended across rental types—was $3,083 per month. Its exact same-month annualized change was 0.5% over 1 year, versus 3.2% over 3 years and 5.0% over 5 years. Thus the most recent direction remains positive but breaks sharply from the faster longer path rather than confirming it. Annualized monthly-return variability was 3.2%, maximum drawdown was -3.4%, and history coverage was 99.0%. That broad observation coverage supports the calculation, while the variability and drawdown mean a single current index snapshot deserves measured confidence. Transparent national discovery ranks among history-eligible ZIPs were 1,634 for momentum, 1,922 for stability, and 2,003 for the balanced score; lower ranks are higher. These are backward-looking measurements, not a forecast or investment recommendation.
Interpret the Zillow level alongside, not as a replacement for, Census results. The five-digit label 02124 is both a Zillow 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 5-year survey, median gross rent was $1,684 for occupied renter homes. Gross rent includes selected utilities, whereas ZORI is an asking-rent index across rental types. The current ZORI is 83.1% above that survey median, a source-universe difference rather than a measured premium for a new listing. The ACS figure describes surveyed occupied households over its survey period, while ZORI describes observed asking rents at the Zillow ZIP-market level; neither series converts the other into an all-in price for any apartment.
Bedroom detail should not be mistaken for directly observed ZIP rents. Ordered from studio through four bedrooms, the modelled estimates that scale the ZIP ZORI with the local HUD ladder are $2,176, $2,349, $3,083, $3,854, and $4,082 monthly, respectively. These are modelled estimates, never measured bedroom rents. The calculation uses the local HUD FMR/SAFMR ladder to set relative bedroom steps around the ZIP index. HUD FMR/SAFMR is an administrative, bedroom-specific standard, not asking rent, and may be ZIP SAFMR or county-derived under the supplied methodology. It therefore organizes a comparison ladder; it does not establish what a landlord asks, a household pays, or what utilities and lease terms apply.
Income arithmetic makes the gap more concrete without turning it into a rule. A household would need $123,320 in annual income for the current monthly ZORI to equal 30% of income; this required-income screen is arithmetic, not advice and not an applicant qualification rule. The ACS ZCTA median household income is $81,923, so the annualized asking-rent index equals 45.2% of that median income. That comparison combines a current asking-rent index with a survey median, so it is not a household budget result. Separately, ACS reports 5,977 of 11,890 renter-occupied homes, or 50.3%, with gross-rent burdens at or above the threshold. That burden measure includes occupied renters and its gross-rent definition; it cannot prove the cost burden, affordability, or eligibility associated with a particular available unit.
Housing-stock and vacancy indicators show a renter-majority occupied base but should be read as inventory composition, not live availability. The ACS ZCTA contains 21,365 housing units: 20,287 occupied and 1,078 vacant, implying a 5.0% vacancy rate. Of the vacant units, 472 were classified for rent, a category that does not identify asking price, condition, lease timing, or whether the unit can actually be leased. Renters occupy 58.6% of occupied homes, and the stock includes single-family units as well as large-multifamily units. Those counts describe the survey’s housing stock and vacancy statuses, not the number of competitively priced listings. In particular, vacancy is not evidence that any specific apartment is open, comparable, affordable, or available on the date a reader searches.
Geographic context narrows the relative rent question but does not replace ZIP evidence. For wider-area context, Boston city context has a rental-context value of $3,469, Suffolk County context is $3,423, and the Boston-Cambridge-Newton, MA-NH metro context is $3,210; each is a wider-area context value rather than a ZIP observation. The ZIP’s current index is below all three context figures, but their broader geographic scopes prevent treating those gaps as an explanation for local pricing. City and county renter shares, vacancy rates, and gross-rent figures are likewise contextual survey measures, while metro apartment-vacancy and time-on-market measures describe a still broader market. They should be used only to frame scale, not to substitute for the ZIP index or property-level evidence.
Several limits persist even with near-complete history coverage. The series dates and universes differ: Zillow supplies a current ZIP-market asking-rent index, ACS supplies a multi-year survey estimate for a matched statistical area, and HUD supplies an administrative standard. Index movement is not a prediction, vacancy is not an offer sheet, and burden data do not identify a unit or tenant. For a real property, check the advertised bedroom count and unit type, monthly asking rent, concessions, which utilities are included, move-in availability, lease length, deposits and fees, income and credit criteria, and whether the address falls within the relevant market definition. Then compare the resulting all-in terms with the source that answers the same question. What fully specified property offering, rather than a broad indicator, is actually under consideration?
","findings":[{"body":"At the June 2026 endpoint, 02124’s Zillow ZORI was $3,083. Same-month annualized growth was 0.5% over 1 year, compared with 3.2% over 3 years and 5.0% over 5 years. Positive but sharply slower recent growth supports the cooling classification. The 3.2% annualized monthly-return variability and -3.4% maximum drawdown show why a single index reading should not be overinterpreted.","title":"Cooling has interrupted the longer rent path"},{"body":"ZORI and ACS are not interchangeable rent measures. ZORI tracks a ZIP-level typical observed asking-rent index across rental types. The matched ACS 2024 5-year ZCTA survey reports a $1,684 median gross rent for occupied renter homes, including selected utilities. The $3,083 ZORI is 83.1% higher, but the spread reflects different time frames, populations, and rent definitions rather than an implied listing markup.","title":"ZORI and ACS answer different rent questions"},{"body":"Using the FY 2026 local HUD FMR/SAFMR ladder, modelled monthly estimates run from $2,176 for a studio to $4,082 for four bedrooms, with $2,349, $3,083, and $3,854 in the intervening bedroom positions. They are scaled from the ZIP ZORI, not observed bedroom-specific rents. The 30% arithmetic screen yields $123,320 annual income, while ACS reports 50.3% of renter households burdened at that threshold or higher.","title":"Bedroom figures are modelled and the income screen is mechanical"},{"body":"The ACS housing-stock count is 21,365, including 20,287 occupied homes and 1,078 vacant homes, for a 5.0% vacancy rate. Of vacant units, 472 are classified for rent, but classification does not confirm current lease availability. The local renter share is 58.6%. For wider rent context, Boston city is $3,469, Suffolk County is $3,423, and the metro is $3,210; none is a ZIP observation.","title":"Vacancy counts provide context, not unit availability"}],"risks":["ZORI should not be read as the advertised rent for a specific dwelling because it blends rental types and does not state utilities, concessions, lease terms, condition, or immediate availability.","The ACS ZCTA is a statistical match rather than a USPS delivery ZIP, is survey-based and multi-year, and describes occupied renter homes; its gross-rent median is not a current asking-rent quote.","HUD-based bedroom results preserve relative administrative standards, not observed bedroom pricing. A unit’s actual rent can differ with its unit type, utility package, terms, and listing-specific characteristics.","Vacancy and rent-burden data are area-level classifications of surveyed homes and households. They cannot establish that a particular apartment is vacant, affordable, eligible, or occupied by a household with any specific finances."],"qa":[{"a":"ZORI is a ZIP-level typical observed asking-rent index blended across rental types, whereas ACS is a five-year survey of occupied renter homes whose median gross rent includes selected utilities. The 83.1% spread therefore compares unlike universes and does not establish an all-in premium on a current listing.","q":"Why does ZORI exceed the ACS median gross rent?"},{"a":"The bedroom figures start with the ZIP ZORI and scale it according to the relative local HUD FMR/SAFMR bedroom ladder. They are modelled estimates, not measurements of completed or advertised bedroom-specific rents. HUD is an administrative standard, so the estimates should not be treated as a unit quotation.","q":"Are the bedroom estimates observed rents for each unit size?"},{"a":"$123,320 is the packet’s arithmetic annual-income screen when the $3,083 monthly ZORI is annualized and divided by 30%. It makes no statement about an individual household’s expenses, assets, other income, eligibility, credit, or a landlord’s actual qualification policy.","q":"What does the required-income figure mean?"},{"a":"History shows positive rent movement over the stated one-, three-, and five-year windows, but the most recent pace is much slower than the longer annualized rates. The coverage is broad, yet observed volatility and drawdown mean the current ZORI is a measured snapshot, not a forecast of the next listing or renewal.","q":"Why should the historical cooling reading not be used as a forecast?"}],"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 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