| OpenStreetMap disused/abandoned tags and brownfields OpenStreetMap contributors | Open API | 98 | 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 | 402 buildings sized | Live 2026-10-09 | CC BY-NC 4.0 (heights); footprints from OpenStreetMap and Microsoft: ODbL |
| 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 | 23 | Live 2026-10-09 | Copernicus open data (© European Union, Copernicus Land Monitoring Service 2006–2021, EEA) |
| Office buildings of 1,000 m² or more, with depth and storeys (EUBUCCO) EUBUCCO (TU Berlin / ai4up), from the Spanish cadastre, Regione Lombardia’s building database and OpenStreetMap EUBUCCO harmonises Europe's building footprints with their use, height and age. Only buildings whose source names the use are kept — the cadastre's office class in Barcelona and Madrid, Lombardy's "commerciale" in Milan, building=office in OpenStreetMap for Dublin and Lisbon — never EUBUCCO's machine-learning guesses. The footprint gives the plan depth, so the conversion score treats them like the German cadastre's offices (scripts/reuse/import-eubucco.ts → src/scripts/data/reuse/eubucco/, ODbL). | Open download | 0 | Live 2026-10-09 | ODbL 1.0 (EUBUCCO v0.2; Dirección General del Catastro, Regione Lombardia, © OpenStreetMap contributors) |
| 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 | 9 | 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 other public bodies have made available for reuse — the City's Albo (art. 15 LR 24/2017) Comune di Bologna — Settore Ufficio di Piano and U.I. Patrimonio, Albo degli immobili resi disponibili per la rigenerazione urbana | Open API | 16 | Live 2026-10-09 | CC BY 4.0 |
| City-owned premises the City has made available for reuse — the Albo (art. 15 LR 24/2017) Comune di Bologna — Settore Ufficio di Piano and U.I. Patrimonio, Albo degli immobili resi disponibili per la rigenerazione urbana | Open API | 43 | Live 2026-10-09 | CC BY 4.0 |
| Private buildings offered at a capped price through the City's Albo (art. 15 LR 24/2017) Comune di Bologna — Settore Ufficio di Piano and U.I. Patrimonio, Albo degli immobili resi disponibili per la rigenerazione urbana | Open API | 6 | Live 2026-10-09 | CC BY 4.0 |
| Empty public homes waiting for works — the Region's Piano ERP Sfitti Zero (Linea 1) Regione Emilia-Romagna — D.G.R. 1147 of 6 July 2026, Allegato 2 (BURERT n. 185, 16 July 2026), proposals by the Comune di Bologna and ACER Bologna | Manual download | 100 | Snapshot 2026-07-06 | No licence stated on the bulletin — an official regional act, used with credit to Regione Emilia-Romagna |
| City-owned buildings recorded as ruined or unused (Patrimonio fabbricati, 31 Dec 2025) Comune di Bologna — Dipartimento Cura e Qualità del Territorio, Patrimonio fabbricati | Manual download | 13 | Snapshot 2025-12-31 | CC BY 4.0 |
| Ruined buildings in the City's technical map (Carta Tecnica Comunale) Comune di Bologna — SIT, Carta Tecnica Comunale, edifici volumetrici | Open API | 54 | Live 2026-10-09 | CC BY 4.0 |
| State buildings recorded as free (Agenzia del Demanio) Agenzia del Demanio — Geoportale, Immobili dello Stato | Open API | 39 | Live 2026-10-09 | No licence stated on the map service — credited to Agenzia del Demanio (its open-data files are CC BY 3.0 IT); shown under the 6 Oct 2026 licence decision |
| State-owned buildings of 1,000 m² or more in use (Agenzia del Demanio) Agenzia del Demanio — Geoportale, Immobili dello Stato | Open API | 122 | Live 2026-10-09 | No licence stated on the map service — credited to Agenzia del Demanio (its open-data files are CC BY 3.0 IT); shown under the 6 Oct 2026 licence decision |
| State buildings offered to investors (Agenzia del Demanio, Portale Investitori) Agenzia del Demanio — Crea valore, investi con noi (investor portal) | Open API | 8 | Live 2026-10-09 | No licence stated on the map service — credited to Agenzia del Demanio (its open-data files are CC BY 3.0 IT); shown under the 6 Oct 2026 licence decision |
| Property confiscated from organised crime and handed to public bodies (ANBSC) Agenzia nazionale per l'amministrazione e la destinazione dei beni sequestrati e confiscati (ANBSC) — OpenRE.G.I.O. | Manual download | 4 | Snapshot 2026-10-09 | IODL 2.0 (Italian Open Data Licence, linked from the portal) |
| Industrial buildings with a footprint of 2,000 m² or more (Carta Tecnica Comunale) Comune di Bologna — SIT, Carta Tecnica Comunale, edifici volumetrici | Open API | 277 | Live 2026-10-09 | CC BY 4.0 |
| OpenStreetMap: land mapped as brownfield OpenStreetMap contributors | Open API | 31 | Live 2026-10-09 | ODbL 1.0 |
| Public buildings their owner records as not used (Treasury property census 2023) Ministero dell'Economia e delle Finanze, Dipartimento dell'Economia — Rilevazione dei beni immobili delle amministrazioni pubbliche (data at 31 Dec 2023) | Manual download | 24 | Snapshot 2026-10-09 | CC BY 4.0 (stated on the MEF open-data page; reuse with the source credited) |
| Public flats, shops and stores their owner records as not used (Treasury property census 2023) Ministero dell'Economia e delle Finanze, Dipartimento dell'Economia — Rilevazione dei beni immobili delle amministrazioni pubbliche (data at 31 Dec 2023) | Manual download | 196 | Snapshot 2026-10-09 | CC BY 4.0 (stated on the MEF open-data page; reuse with the source credited) |
| Cultural heritage in danger in Bologna — Italia Nostra's Lista Rossa Italia Nostra APS — Lista Rossa dei beni culturali in pericolo | Open API | 7 | Live 2026-10-09 | © Italia Nostra APS, no licence stated — only the name, the street, the list status and a link are kept (no descriptions or photos); credited to Italia Nostra |