Baltimore City Permits & Property Data

DC DDOT TOPS Permits - Construction & Occupancy

j0401/dc-tops-permits

Washington DC DDOT right-of-way permits (public open data): 543k construction permits and 983k occupancy permits, 2005-present. Fees broken out by kind, three named parties, ward/ANC/SMD/ZIP, district overlays and pre-computed cycle times. Search by address, owner, permittee, ward or status.

NYC Property Valuation - Assessment & 5-Year Value Trail

j0401/nyc-property-valuation

New York City property assessment records (public open data, 11.7M rows, 2023-2027): every parcel's owner and address, its value through five assessment stages, and the year-over-year movement in market and assessed value.

MD Baltimore City Building Permits

j0401/md-baltimore-building-permits

Baltimore City building & housing permits (~292k, 2019-present, open data): full permit file - scope-of-work, cost, existing/proposed land use, address, neighborhood, district, housing typology, original vs modification. Search by case/keyword/address/cost/date; aggregate by neighborhood/use.

NY Property Assessments - Parcels, Owners & 5-Year Value Trail

j0401/ny-property-assessments

New York property assessment rolls (public open data, 23.6M records, 2021-2025): every parcel with its owner, mailing address, exemptions and six value columns - plus each parcel's exact year-over-year value movement. Excludes New York City, which files separately.

Maryland Property Assessments - Values, Structure & Sales

j0401/md-property-assessments

All 2.44M Maryland real-property assessment accounts (public open data, 24 jurisdictions): assessment values, land/improvement split, CAMA structure (year built, sq ft, units, grade, type), last recorded sale with seller name, exemptions, homestead. Search by county, city, ZIP, address or sale date.

Philadelphia Building Permits - Contractor & Property Data

j0401/philly-permits

Philadelphia building & trade permits (public open data, 584,800 permits, 2007-today): type, description, approved scope, issue and completion dates, owner of record, full contractor block, address, council district and geocode.

NJ Statewide Construction Permits

j0401/nj-permits

New Jersey construction permits (public open data, 2.68M records): the single statewide register every NJ municipality files into - permit type, status, use group, fee breakdown, construction cost, square feet, block+lot, municipality, county. Filter by county/type/cost/date or aggregate.

MD Baltimore County Permits - Building & Trade

j0401/md-baltco-permits

Baltimore County, MD building & trade permit registers (~310k, public open data): who pulled a permit for what and where. Building/construction (~165k, est. cost + depth), electrical (~64k), gas (~42k), plumbing (~39k). Search by permit number, owner, address, status, date; aggregate by type/status.

All 2.67M Connecticut state credentials (public open data): every professional licence, business registration and brand registration the State issues. Holder name, credential type and number, issuing board, status, dates and address. Search by name, type, status, city or ZIP.

Cook County Assessment Appeals - Values & Board Decisions

j0401/cook-assessment-appeals

Cook County assessment records keyed on one parcel id (public open data, 59.8M rows): a parcel's value as mailed, certified and Board-revised; every appeal case with type, status and reasons; and Board of Review decisions showing the Assessor's value against the Board's and the outcome.