At June 2026, Zillow’s ZIP-level Observed Rent Index for 02125 was $3,381, 1.5% below its same-month level a year earlier. This is a typical observed asking-rent index blended across rental types, not a quoted rent for a particular available unit. The five-digit 02125 label is both a Zillow ZIP market identifier and a matched Census ZCTA. A ZCTA is a Census statistical area and is not identical to a USPS delivery ZIP. The immediate signal is cooling, but its decision value depends on separating asking-rent evidence from household survey, HUD standard, and resale-market evidence.
The direct rolling-three-month Redfin ZIP resale observation creates the sharpest cross-market tension. Median sold price was $644,854, down 8.7% year over year, a larger decline than the asking-rent index’s annual easing. Yet resale activity was not absent: 62 homes sold with a median 23 days on market. Inventory stood at 73 homes and 3.6 months of supply, while the average sale-to-list ratio was 99.94%; sales above list were not the majority. These are for-sale market observations, not rental transactions or rental comparables. The resale decline therefore challenges a simple reading of durable rent strength, while the transaction pace shows that the ZIP’s resale evidence is not merely an inactive-market reading.
Longer Zillow history puts the recent decline in perspective without turning it into a forecast. The series has 115 monthly observations, 114 consecutive month-to-month returns, and complete coverage. Same-month change was positive at 0.4% annualized over three years and 4.0% annualized over five years, so the latest one-year retreat breaks from, rather than confirms, the longer upward path. Monthly ZORI changes translate into 3.4% annualized variability, meaning a single current rent snapshot should not be treated as a fixed market level. Separately, the maximum peak-to-trough drawdown was 6.9%, demonstrating that prior rent paths included meaningful declines. Transparent national discovery ranks were 2,602 for momentum, 2,147 for stability, and 2,730 for the balanced measure; lower ranks are stronger, but none predicts future rents.
The ACS and HUD benchmarks answer different questions from Zillow. In the matched ACS 2024 five-year ZCTA survey, median gross rent was $1,949 with a $127 margin of error; this is a survey measure for occupied renter homes that includes selected utilities. The current Zillow asking-rent index is 73.5% higher, a difference that should not be mistaken for a one-to-one change in lease rents because the populations, timing, utility treatment, and rent concepts differ. HUD’s local two-bedroom standard was $2,311. HUD FMR or SAFMR is an administrative bedroom-specific standard, not an asking-rent observation, so it is useful for scaling and program context rather than identifying a market asking price.
Using the local HUD bedroom ladder to scale the ZIP Zillow index produces modelled monthly estimates of $2,386 for a studio, $2,576 for one bedroom, $3,381 for two bedrooms, $4,227 for three bedrooms, and $4,477 for four bedrooms. These estimates preserve the local HUD size relationships while anchoring the two-bedroom point to current ZIP ZORI. They are modelled estimates, never measured bedroom rents, and they do not show which sizes are currently available, what utilities are included, or the condition and location of any individual home. A particular listing can differ substantially because the index and the HUD ladder each aggregate information rather than appraise a unit.
Household-income and rent-burden evidence intensify the affordability tension. The matched ACS ZCTA reports median household income of $82,953 with a $12,485 margin of error. Applying the 30% required-income screen to the current monthly Zillow index produces $135,240 of annual income, and the index equals 48.9% of the reported median household income when annualized. That screen is arithmetic, not advice and not an applicant qualification rule. Separately, 47.2% of ACS occupied renter households reported spending at least 30% of income on rent. The burden statistic is a survey-wide household measure; it cannot establish the cost burden, lease terms, or affordability of a particular household or unit.
The survey’s housing-stock evidence shows a renter-majority area without proving current listing availability. The ZCTA contained 15,307 housing units, including 1,061 vacant units, for a 6.9% vacancy rate; 459 vacant units were classified as for rent. Renter households accounted for 65.1% of occupied homes, while the stock included 2,375 single-family units and 2,801 units in large multifamily structures. Vacancy categories are not a count of immediately rentable homes and do not verify the condition, pricing, or accessibility of a specific unit. For wider Zillow asking-rent context, Boston city was $3,469, Suffolk County was $3,423, and the Boston-Cambridge-Newton, MA-NH metro was $3,210; each is a broader scope, not a ZIP-level substitute.
Annualizing ZIP ZORI and dividing by the Redfin median sold price gives a 6.29% cross-source screening ratio. It simply pairs an asking-rent index with a resale median and does not measure operating costs, financing, taxes, maintenance, vacancy for a property, or any investor outcome. The contrast between modest rent cooling, a longer but variable historical rise, high survey burden, and a steeper resale-price decline warrants careful source separation rather than a single conclusion. Useful property-level checks are the actual bedroom count, lease start date, advertised and included utilities, concession terms, unit condition, direct nearby listing comparisons, sale date, and whether the property fits the ZIP boundary. Which of those unit-specific facts would materially change the aggregate picture?