At $1,637 in June 2026, 21217’s current Zillow Observed Rent Index (ZORI) is up 4.35% from a year earlier. The five-digit label 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. ZORI is a typical observed asking-rent index blended across rental types, rather than a quote for a particular available home. Annualizing this index produces a $65,480 income figure under the 30% required-income screen; that screen is arithmetic, not advice or an applicant qualification rule. Against ACS median household income of $38,409, the same arithmetic is 51.1%, putting the asking-rent snapshot and local income measure in immediate tension.
That tension should not be treated as a conflict between like-for-like rent series. The matched ZCTA’s ACS 2024 five-year survey reports median gross rent of $1,119 for occupied renter homes; it is a survey measure that includes selected utilities, not a current asking-rent measure. The current ZORI sits 46.3% above that ACS median, a gap that can reflect different populations, definitions, and reference periods without describing a lease. HUD’s FY2026 two-bedroom FMR/SAFMR standard is $1,857. It is an administrative, bedroom-specific standard rather than asking rent. Scaling ZIP ZORI by the local HUD ladder generates modelled—not measured—monthly estimates of $1,201 for a studio, $1,332 for one bedroom, $1,637 for two, $2,079 for three, and $2,302 for four.
ACS occupancy and burden data make the distributional issue visible but cannot certify any household’s position. In the ZCTA survey, 5,562 of 10,729 renter-occupied households are counted at the burden threshold or above, a 51.8% share; that aggregate does not prove that a given unit or applicant is burdened. The housing stock contains 19,995 units, of which 4,663 are vacant, yielding a 23.3% vacancy rate. Renter occupancy predominates, and the stock includes both single-family and large multifamily structures. The source separates vacant units categorized for rent from other stated uses. Vacancy does not establish the condition, price, timing, or immediate availability of a particular rental.
The time series records a sustained rise, with meaningful recent moderation rather than a reversal. Through the stated history endpoint, exact same-month ZORI changes annualize to 4.35% over 1 year, 4.58% over 3 years, and 5.35% over 5 years. Thus the latest positive direction confirms the longer upward path, but its pace trails both longer lookbacks. Coverage is 100%, and annualized monthly-return variability is 4.07%, with a maximum drawdown of -4.16%. This high-variability classification means a single current rent snapshot deserves less confidence than a smooth series would warrant. Transparent national discovery ranks among history-eligible ZIPs are 466 for momentum, 2,636 for stability, and 1,362 for the balanced measure; lower ranks are higher, and these backward-looking measures are neither forecasts nor investment recommendations.
Broader context places the ZIP’s current asking-rent index below surrounding reference readings, but those readings do not replace ZIP evidence. The Baltimore city context rent is $1,799, the Baltimore City county context rent is $1,801, and the Baltimore-Columbia-Towson, MD metro context rent is $1,936; each is a wider-geography context value in this comparison, not a direct ZIP rent observation. The city and county context values remain scope-labelled benchmarks rather than bedroom-matched listings. The metro context can frame a broader comparison, but its labor, apartment, and resale measures should not be imported into this ZIP’s rental transaction record.
Resale evidence produces the sharpest counterweight. In Redfin’s direct rolling-three-month ZIP for-sale observation, not a rental transaction set, median sold price was $162,463, up 24.97% year over year. It logged 103 homes sold, with median marketing time of 60 days. Inventory was 255 homes and had risen 49.01%; months of supply stood at 7.5. Average sale-to-list was 102.46%, with 22.02% sold above list and 22.55% going off market within two weeks. These measures describe direct ZIP resale liquidity and pricing signals only; they neither supply rental comparables nor establish property-level cash flow.
Read together, the sources resist a one-direction story. The sharp resale price increase and above-list sales signal are consistent with a positive rent history, yet the inventory increase, supply, and marketing-time readings challenge a simple claim of uniformly tight conditions. The rent series also shows a latest annual pace below its longer-run rates, while the income and ACS gross-rent comparisons show that asking rent is not interchangeable with household survey rent. Annualized ZIP ZORI divided by the Redfin median sold price equals 12.09%. This is solely a cross-source screening ratio; it is not a cap rate or property yield and says nothing about net return, expected return, or property economics.
Several limits govern any decision use. ZORI is an area-level blended asking-rent index, ACS is a retrospective survey of occupied renter homes with selected utilities, HUD is an administrative standard, and Redfin tracks resale rather than leases. Useful property-level checks are contemporaneous advertised rents for matching bedroom count and building form; the quoted utilities, fees, lease term, condition, and availability; and whether the individual listing’s price and dates match the resale record. Check whether a vacant unit is actually offered for rent instead of inferring availability from the area vacancy count. What current unit-specific evidence would validate or contradict this area-level screen?
","findings":[{"body":"Current ZIP ZORI of $1,637 is a blended asking-rent index, whereas the matched ZCTA’s ACS five-year median gross rent is $1,119 for occupied renter homes and includes selected utilities. The 46.3% gap is material for screening but is not a rent-comparable spread: the series differ in population, timing, and what they measure.","title":"Asking-rent and survey-rent gap"},{"body":"Exact same-month rent changes were positive at each reported horizon, but the 1-year 4.35% pace was below the 3-year 4.58% and 5-year 5.35% rates. Full coverage supports observation continuity, while 4.07% annualized monthly-return variability and a 4.16% maximum drawdown justify limited confidence in any single current index reading. These are backward-looking measurements, not forecasts.","title":"Positive rent path, limited snapshot confidence"},{"body":"Redfin’s direct rolling-three-month ZIP resale observation shows a $162,463 median sold price, 24.97% annual price growth, and 102.46% average sale-to-list. Yet 7.5 months of supply and 60 median days on market show that price and competitive-sale signals coexist with more inventory and slower marketing. These are for-sale indicators, not rental transactions or rental comps.","title":"Resale strength and liquidity are mixed"},{"body":"The 30% income screen converts current ZORI into $65,480 annual income, versus $38,409 ACS median household income. Separately, 51.8% of survey renter households met the burden threshold and the ZCTA vacancy rate was 23.3%. Neither statistic reveals the rent, utility package, condition, or availability of a specific home; property-level verification remains necessary.","title":"Affordability and vacancy need unit-level confirmation"}],"risks":["Comparing the current Zillow asking-rent index with ACS median gross rent can mislead if utility treatment, occupied-household sampling, and different reference periods are treated as a single rental comp set.","High historical variability and the recorded drawdown mean the current index may be less representative of near-term asking conditions than its positive multi-year path alone suggests; no history metric forecasts rent.","The ZCTA vacancy rate, rent-burden share, and vacancy-use categories are aggregates. They do not establish a particular unit’s availability, physical condition, utility costs, tenant mix, or applicant outcome.","Redfin’s sale prices and liquidity metrics concern resale homes, while the rent-to-price figure combines disparate sources. It omits operating expenses, financing, taxes, maintenance, and unit-specific rent evidence."],"qa":[{"a":"The $1,637 ZORI is a typical observed asking-rent index blended across rental types. The $1,119 ACS figure is a five-year survey median for occupied renter homes and includes selected utilities. The two measures differ in timing, population, and construction, so their 46.3% separation is a cross-universe comparison rather than a matched-rent spread.","q":"Why is Zillow ZORI higher than the ACS median gross rent?"},{"a":"No. The studio through four-bedroom figures are modelled monthly ZIP estimates created by scaling the ZIP ZORI with the local HUD ladder. HUD FMR/SAFMR is a bedroom-specific administrative standard, not asking rent, so the ladder does not demonstrate what any particular bedroom type actually asked or leased for in the ZIP.","q":"Are the bedroom figures observed rents for available units?"},{"a":"All reported history measurements are backward looking. Positive exact same-month changes at one, three, and five years show prior direction, whereas high annualized monthly-return variability and the maximum drawdown warn against over-weighting a single month. The national discovery ranks are transparent comparative labels among eligible ZIPs, not forecasts, investment grades, or recommendations.","q":"How should the historical rent metrics be interpreted?"},{"a":"It provides direct ZIP for-sale evidence from a rolling three-month observation: sale prices, marketing pace, inventory, supply, and sale-to-list outcomes. It does not describe rental transactions. Annualized ZORI divided by median sold price is only a cross-source screening ratio; it does not account for property costs or establish a cap rate, property yield, or expected return.","q":"What does the Redfin resale block add to rental analysis?"}],"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 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