At June 2026, Zillow's ZIP-level ZORI was $3,336 per month, up 3.5% from the same month a year earlier. This is a typical observed asking-rent index blended across rental types, rather than a lease ledger or an individual-unit quote. The immediate tension is cross-market: the direct ZIP for-sale median sold price was $1,189,681 in the rolling-three-month window ending June 30, down 8.0% year over year, while the asking-rent index increased. Annualizing ZORI and dividing by that resale median produces a 3.36% cross-source screening ratio only; it is not a cap rate, property yield, net return, or expected return. The divergence flags that rental and resale observations are moving differently, without establishing why.
The backward-looking rent path is positive but has decelerated relative to its longer window. Exact same-month annualized ZORI change was 3.54% over 1-year and 3.68% over 3-years, compared with 5.62% over 5-years. Thus the latest annual gain confirms continued growth rather than breaking the longer upward path, but it trails the five-year pace. The history has 99.28% coverage, comprising 137 observations and 135 consecutive monthly returns, so the series is near-complete rather than a sparse snapshot. Monthly-return variability annualizes to 3.27%, which limits precision around a current reading; separately, the historical maximum drawdown was 13.59%, showing a material past retreat can occur within an overall rising path. Transparent national discovery ranks among history-eligible ZIPs were 738 for momentum, 2,007 for stability, and 1,174 for the balanced measure; lower ranks are stronger. These are descriptive ranks and backward-looking measurements, not forecasts or investment recommendations.
The matched Census ZCTA provides a different household universe. A ZCTA is a statistical area and is not identical to a USPS delivery ZIP; here it is the Census match for the Zillow ZIP label 02138. In the ACS 2024 five-year survey, median gross rent was $2,772, a measure for occupied renter homes that includes selected utilities. ZORI was 20.3% higher, a definitional difference rather than evidence that either series is incorrect: it is a current asking-rent index across rental types. The ZCTA median household income was $119,967. Arithmetic at a 30% rent-to-income screen places the current index at $133,440 of annual income and 33.4% of that median. That screen is not advice and does not determine applicant qualification.
Bedroom figures are modelled monthly ZIP estimates, not measured bedroom rents. They scale ZIP ZORI using the local HUD ladder, producing $2,354 for a studio, $2,542 for one bedroom, $3,336 for two bedrooms, $4,170 for three bedrooms, and $4,417 for four bedrooms. The local HUD two-bedroom FMR/SAFMR standard is $2,311, making the ZIP ZORI 144.4% of that standard. HUD FMR/SAFMR is an administrative, bedroom-specific standard rather than asking rent, and its purpose and construction differ from both Zillow's blended index and ACS gross rent. The ladder usefully keeps bedroom spacing locally anchored, but it does not observe availability, condition, utilities, concessions, or the rent of any particular unit.
Within the matched ZCTA stock, 5,511 units sit in large multifamily structures and renter occupancy is the larger tenure group. The 11.7% overall vacancy rate spans several vacant classifications, including units marked for rent, for sale, and seasonal use; it cannot demonstrate availability, condition, or pricing for a specific rental. In the ACS renter-household survey, 48.2% reported gross rent consuming 30% or more of household income. This observed burden is different from the arithmetic screen: it describes surveyed occupied renter households, not the payment burden or eligibility of any prospective tenant. Together, the stock, vacancy, and burden figures widen the frame beyond a typical current asking-rent index.
Comparison readings sharpen scale but do not replace ZIP evidence. Cambridge city context has a $3,598 asking-rent index, Middlesex County context has $3,260, and Boston-Cambridge-Newton, MA-NH metro context has $3,210; each is a wider geography than the ZIP. Cambridge city's ACS median gross rent is nearly aligned with the ZIP ZCTA reading, whereas the county's median gross rent is lower, but those series remain context only. The ZIP's renter-majority tenure mix contrasts with the county context's lower renter share, and the metro's apartment vacancy statistic is a separate market measure from the ZCTA's all-unit vacancy rate. These comparisons give scale, not local rental comps, and do not modify Zillow, ACS, HUD, or Redfin definitions.
Redfin's direct ZIP rolling-three-month resale observation is solely for-sale evidence, not rental transactions, property economics, or a rent comparable set. Its liquidity signals show different facets: 87 homes sold with a median 20 days on market, while inventory was 78 homes and months of supply were 2.7. The average sale-to-list ratio reached 102.11%, and 44.75% of sales closed above list. Those measures coexist with the resale-price decline reported above and with rent-index growth, showing that above-list outcomes and a lower annual median price can appear in the same window. They challenge any simple reading of the rent/price screen, which remains only an annualized-ZORI-to-median-price ratio and not a property-level financial measure.
Every number above has a scope and timing limit. ZORI is a typical asking-rent index, so it cannot identify an actual quoted rent, lease execution, bedroom mix, or concession. ACS estimates have sampling uncertainty, and matched ZCTA boundaries are statistical rather than USPS delivery boundaries. HUD is a standard, history is backward-looking, and the Redfin window is resale-only. Property-level verification can check the listing's bedroom count and asking price; utilities and fees; lease term and concessions; unit condition and availability date; building type; and the actual comparable rental and sale records used for the decision. Those checks determine whether a particular address resembles any ZIP-level signal, while none of the aggregate screens establishes unit vacancy, tenant burden, or transaction economics.