| OpenStreetMap disused/abandoned tags and brownfields OpenStreetMap contributors | Open API | 23 | Live 2026-10-09 | ODbL 1.0 (© OpenStreetMap contributors) |
| Rail, S-Bahn and U-Bahn stations (OpenStreetMap) OpenStreetMap contributors | Open API | scoring | Live 2026-10-09 | ODbL 1.0 (© OpenStreetMap contributors) |
| Building heights: GlobalBuildingAtlas (TU Munich) Zhu, X. X., Chen, S., Zhang, F., Shi, Y., Wang, Y. (2025), Technical University of Munich GlobalBuildingAtlas: an open global and complete dataset of building polygons, heights and LoD1 3D models. Earth System Science Data 17(12), 6647–6668, doi:10.5194/essd-17-6647-2025. Read from the Parquet copy on Source Cooperative. Satellite-derived heights (typically 1.5–3 m error in Europe), turned into storeys with storey heights fitted on Berlin; used only where no register or official 3D model sizes the building. | Open download | 1 buildings sized | Live 2026-10-09 | CC BY-NC 4.0 (heights); footprints from OpenStreetMap and Microsoft: ODbL |
| Floor areas: BBR building register (Aarhus Kommune) Aarhus Kommune; Bygnings- og Boligregistret (BBR), Vurderingsstyrelsen Data fra Bygnings- og Boligregistret (BBR), via Aarhus Kommune (layer geokodede_bbr_bygninger). The register’s total building area (all storeys, used attic included, basement not); no storeys. robots.txt of webkort.aarhuskommune.dk disallows everything — fetched under EHC’s advisory policy of 8 Oct 2026, one BBOX request per building, no owner data. | Open API | 12 buildings sized | Live 2026-10-09 | Free reuse (BBR terms); CC BY 4.0 on opendata.dk |
| Road noise (EU Environmental Noise Directive, Lden) European Environment Agency | Open API | scoring | Live 2026-10-09 | EEA standard re-use policy (attribution) |
| Leerstandsmelder.de — public reports of empty buildings Leerstandsmelder (Gängeviertel e.V., Hamburg) Shown while we ask Leerstandsmelder for permission. Reports since 2016 only, with the address, the month reported and a link to each entry; not checked by EHC. Each point says when a report has since been marked demolished, lived in, in interim use or rebuilt on Leerstandsmelder, and the owner type the reporter gave (private owners are never named). | Asking for permission | 0 | Pending 2026-10-09 | Credited to Leerstandsmelder.de; asking for permission |
| Open-ended property funds: buildings they report partly empty Open-ended real-estate funds (each point names its fund and report) German and Austrian open-ended public property funds must list every property with its vacancy (or letting) rate in their annual and half-year reports. scripts/reuse/import-fund-reports.ts reads those lists; properties at 10 % vacancy or more are shown, those at 25 % or more count as evidence. | Open download | 0 | Live 2026-10-09 | Published fund report (KAGB / KARBV property list), cited per point |
| Co-working spaces, department stores, banks, hotels and cinemas listed as permanently closed Overture Maps Foundation (closure data: BrightQuery company records) Places with operating_status "permanently_closed" in the monthly Overture release, read by scripts/reuse/import-overture-closures.ts and matched to the building they sit in. A closed business is usually one unit; names are shown only for companies, never for sole traders. | Open download | 0 | Live 2026-10-09 | CDLA Permissive 2.0 (Overture Maps Foundation) |
| Land without current use and stalled construction, mapped from satellite imagery (Copernicus Urban Atlas 2006–2018) European Environment Agency — Copernicus Land Monitoring Service Urban Atlas class 13400 (brownfields, demolition sites and gaps in the built-up area, 0.25 ha and up) compared across the 2006, 2012 and 2018 editions, so each plot says how long it has stood unused; plus construction sites (13300) already under way in 2012, and 2012 construction sites left unused by 2018. Read from the EEA's open ArcGIS services, the same way in every radar city. The 2021 edition (Copernicus Data Space) drops plots built on since 2018 where scripts/reuse/import-urban-atlas-2021.ts has been run. Points are context, never evidence of vacancy. | Open API | 98 | Live 2026-10-09 | Copernicus open data (© European Union, Copernicus Land Monitoring Service 2006–2021, EEA) |
| Stalled construction and buildings held by insolvent developers EHC research (dated press and court sources per point) Signa, Adler/Consus and other developer insolvencies since 2022 and stalled sites, each with its latest dated status (src/scripts/data/reuse/stalled-projects.json; news leads from scripts/reuse/mine-news.ts are reviewed before they join). | EHC research | 0 | Live 2026-10-09 | Cited publisher per point |
| Church buildings the dioceses and regional churches plan to give up Catholic dioceses and Protestant regional churches (their building plans), via EHC research Buildings a church body’s published building plan or recent reporting names as to be given up, without church funding, for sale or lease, or profaned (src/scripts/data/reuse/church-plans.json and brussels-churches.json). | EHC research | 0 | Live 2026-10-09 | Cited publisher per point |
| Named buildings and sites from EHC research (each with its own source) European Housing Coop research | EHC research | 10 | Live 2026-10-09 | Facts cited to their publishers |
| Year built and listing: OpenStreetMap building tags OpenStreetMap contributors start_date / construction_date and heritage / listed_status of the OpenStreetMap outline a record is matched to, where no register answers. Read with the outline match, not a separate query. | Open API | scoring | Live 2026-10-09 | ODbL 1.0 (© OpenStreetMap contributors) |
| Buildings of 500 m² or more on land owned by the municipality, the State, the Region or Aarhus Havn Aarhus Kommune (ownership layers from LOIS/ESR) joined with the BBR building layer | Open API | 1,134 | Live 2026-10-09 | Open data, Aarhus Kommune (opendata.dk; the portal lists CC BY 4.0 for nearly all Aarhus datasets, the dataset page names none) — used with credit to Aarhus Kommune; BBR terms for the building data |
| Office buildings of 1,000 m² or more, with registered floor area (BBR) Bygnings- og Boligregistret (BBR), as published in Aarhus Kommune's open WFS | Open API | 528 | Live 2026-10-09 | Free reuse of BBR data (Danish basic data programme); credit: Data fra Bygnings- og Boligregistret (BBR), via Aarhus Kommune's open WFS |
| Industrial, workshop and warehouse buildings of 3,000 m² or more (BBR) Bygnings- og Boligregistret (BBR), as published in Aarhus Kommune's open WFS | Open API | 208 | Live 2026-10-09 | Free reuse of BBR data (Danish basic data programme); credit: Data fra Bygnings- og Boligregistret (BBR), via Aarhus Kommune's open WFS |
| Urban transformation areas (Kommuneplan 2025, "byomdannelse") Aarhus Kommune | Open API | 26 | Live 2026-10-09 | Open data, Aarhus Kommune (opendata.dk; the portal lists CC BY 4.0 for nearly all Aarhus datasets, the dataset page names none) — used with credit to Aarhus Kommune |
| Local plans in the proposal stage Plandata.dk (Erhvervsstyrelsen) — Aarhus Kommune's plans | Open API | 10 | Live 2026-10-09 | Open data, Plandata.dk (Danish Business Authority; free reuse with credit) |
| Local plans adopted since 2024 for homes or mixed use, including conversions Plandata.dk (Erhvervsstyrelsen) — Aarhus Kommune's plans | Open API | 26 | Live 2026-10-09 | Open data, Plandata.dk (Danish Business Authority; free reuse with credit) |
| Brownfield land (OpenStreetMap) OpenStreetMap contributors | Open API | 13 | Live 2026-10-09 | ODbL 1.0 |