> ## Documentation Index > Fetch the complete documentation index at: https://docs.gabin.ai/llms.txt > Use this file to discover all available pages before exploring further. # List the companies linked to a building > Companies linked to a building: occupants (an establishment located there, matched by address or position) and corporate owners (land files), merged by SIREN. Active companies first, then by name. Sole proprietorships (entrepreneurs individuels) are listed as occupants by their registered name; companies under partial diffusion never are. Up to 500 companies can be reached; above 100 linked companies, the address is usually a business domiciliation. ## OpenAPI ````yaml https://api.gabin.ai/v1/openapi.json get /v1/buildings/{id}/companies openapi: 3.1.0 info: title: Gabin API version: 1.0.0 description: >- French company and real-estate data for builders: companies (SIRENE, RNE), establishments, officers, annual accounts, buildings (BDNB), parcels, addresses, zones, multi-criteria search, vector tiles, reference data. Guides: https://docs.gabin.ai. **Authentication.** Every endpoint except `/v1/health` and `/v1/openapi.json` requires `Authorization: Bearer `: an API key (`gab_live_…`, created at https://gabin.ai/compte/api) or an OAuth access token (`gat_…`, MCP connectors). **Limits (free plan).** 60 weighted requests per minute and 5,000 units per UTC day per account. A request weighs 1 unless its endpoint states otherwise. Every response carries `X-RateLimit-Limit`, `X-RateLimit-Remaining`, `X-RateLimit-Reset`, `X-Quota-Remaining` and `X-Request-Id`. **Responses.** Success: `{ "data": …, "meta": { … } }`. Lists are paginated by an opaque cursor (`meta.page.next_cursor`, up to 100 per page and 10,000 results per query). Errors: `{ "error": { "code", "message", "docs_url" } }`. Dates are ISO 8601, amounts in euros, areas in m², coordinates WGS84 `[lon, lat]`. **Data rules.** Companies under SIRENE partial diffusion are returned without the person's name, street address, position or building. Officers come from public registers only (name, first names, month and year of birth, mandates), without contact details. No contact data is exposed. contact: name: Gabin url: https://gabin.ai servers: - url: https://api.gabin.ai security: - bearerAuth: [] tags: - name: Companies description: >- Companies (SIRENE legal units): search with filters, profile, establishments, officers, annual accounts. - name: Establishments description: Establishments (SIRENE), by SIRET. - name: Officers description: >- Company officers from public registers (RNE): search by name, mandates, relationships. - name: Reference data description: >- Values accepted by the filters: NAF activities, legal form families, headcount ranges. - name: Account description: 'The account behind the API key: plan, limits, remaining quota.' - name: Meta description: Service status and OpenAPI document. No authentication. - name: Buildings description: >- French buildings (BDNB): profile, linked companies, sections (energy, transactions, owners, condominium, parcels, parking, permits, fiber, planning, market) and geographic search. - name: Parcels description: 'Cadastral parcels: boundary, area, buildings.' - name: Addresses description: >- Address geocoding (Base Adresse Nationale) with the BDNB building at the address, and named places. - name: Zones description: >- Cities, districts (merged IRIS), departments, and market figures of a zone (prices, rents, demography, income). - name: Search description: >- Multi-criteria search on buildings or companies in a zone: a catalog of fields, AND conditions, OR groups. - name: Tiles description: Vector tiles (Mapbox Vector Tile) of the gabin.ai map layers. paths: /v1/buildings/{id}/companies: get: tags: - Buildings summary: List the companies linked to a building description: >- Companies linked to a building: occupants (an establishment located there, matched by address or position) and corporate owners (land files), merged by SIREN. Active companies first, then by name. Sole proprietorships (entrepreneurs individuels) are listed as occupants by their registered name; companies under partial diffusion never are. Up to 500 companies can be reached; above 100 linked companies, the address is usually a business domiciliation. operationId: listBuildingCompanies parameters: - name: id in: path required: true description: >- BDNB building id (`batiment_groupe_id`). Example: "bdnb-bg-CJ69-HW8G-PTTG". schema: type: string maxLength: 40 pattern: ^bdnb-[a-z]{2,4}-[A-Za-z0-9]{4}(-[A-Za-z0-9]{4})*$ - name: cursor in: query required: false description: >- Cursor returned in `meta.page.next_cursor` by the previous page. Keep the same filters; the page size is the one of the first page. schema: type: string maxLength: 300 - name: limit in: query required: false description: Results per page, 1 to 100. Default 20. schema: default: 20 type: integer minimum: 1 maximum: 100 responses: '200': description: OK headers: X-Request-Id: $ref: '#/components/headers/X-Request-Id' X-RateLimit-Limit: $ref: '#/components/headers/X-RateLimit-Limit' X-RateLimit-Remaining: $ref: '#/components/headers/X-RateLimit-Remaining' X-RateLimit-Reset: $ref: '#/components/headers/X-RateLimit-Reset' X-Quota-Remaining: $ref: '#/components/headers/X-Quota-Remaining' content: application/json: schema: type: object required: - data - meta properties: data: type: array items: $ref: '#/components/schemas/BuildingCompany' meta: $ref: '#/components/schemas/PageMeta' example: data: - company: siren: '999100017' name: Atelier Thermique du Rhône naf_code: 43.29A naf_label: Travaux d'isolation sector: renovation-energetique created_on: '2014-03-12' active: true partial_diffusion: false gabin_url: >- https://gabin.ai/entreprise/atelier-thermique-du-rhone-999100017 legal_form: SAS, société par actions simplifiée headcount_range: '11' headquarters: address: 12 rue Émile Zola postal_code: '69100' city: Villeurbanne latest_revenue: null latest_revenue_year_end: null roles: - occupant establishment: siret: '99910001700011' headquarters: true trade_name: null naf_code: 43.29A naf_label: Travaux d'isolation active: true meta: page: next_cursor: null limit: 20 total: 1 total_kind: exact '400': description: INVALID, PAGINATION_LIMIT headers: X-Request-Id: $ref: '#/components/headers/X-Request-Id' content: application/json: schema: $ref: '#/components/schemas/Error' examples: INVALID: value: error: code: INVALID message: 'limit: Too big: expected number to be <=100' docs_url: https://docs.gabin.ai/errors#invalid PAGINATION_LIMIT: value: error: code: PAGINATION_LIMIT message: >- At most 10,000 results can be reached for one query. Narrow the filters. docs_url: https://docs.gabin.ai/errors#pagination_limit '401': description: UNAUTHENTICATED headers: X-Request-Id: $ref: '#/components/headers/X-Request-Id' content: application/json: schema: $ref: '#/components/schemas/Error' examples: UNAUTHENTICATED: value: error: code: UNAUTHENTICATED message: Invalid or revoked API key. docs_url: https://docs.gabin.ai/errors#unauthenticated '404': description: NOT_FOUND headers: X-Request-Id: $ref: '#/components/headers/X-Request-Id' content: application/json: schema: $ref: '#/components/schemas/Error' examples: NOT_FOUND: value: error: code: NOT_FOUND message: No company with SIREN 999999999. docs_url: https://docs.gabin.ai/errors#not_found '429': description: RATE_LIMITED, QUOTA_EXCEEDED headers: X-Request-Id: $ref: '#/components/headers/X-Request-Id' Retry-After: $ref: '#/components/headers/Retry-After' content: application/json: schema: $ref: '#/components/schemas/Error' examples: RATE_LIMITED: value: error: code: RATE_LIMITED message: >- Rate limit reached (60 weighted requests per minute). Retry in 12 s. docs_url: https://docs.gabin.ai/errors#rate_limited QUOTA_EXCEEDED: value: error: code: QUOTA_EXCEEDED message: >- Daily quota reached (5000 units per UTC day). It resets at 00:00 UTC. docs_url: https://docs.gabin.ai/errors#quota_exceeded '503': description: TIMEOUT, BUSY headers: X-Request-Id: $ref: '#/components/headers/X-Request-Id' Retry-After: $ref: '#/components/headers/Retry-After' content: application/json: schema: $ref: '#/components/schemas/Error' examples: TIMEOUT: value: error: code: TIMEOUT message: The query took too long. Narrow it down and retry. docs_url: https://docs.gabin.ai/errors#timeout BUSY: value: error: code: BUSY message: >- The API is serving too many database requests right now. Retry in 1 s. docs_url: https://docs.gabin.ai/errors#busy components: headers: X-Request-Id: description: Unique id of the request; quote it when contacting support. schema: type: string X-RateLimit-Limit: description: Weighted requests allowed per minute for the account. schema: type: integer X-RateLimit-Remaining: description: Weighted requests left in the current minute. schema: type: integer X-RateLimit-Reset: description: Seconds until the per-minute window resets. schema: type: integer X-Quota-Remaining: description: Units left in the daily quota (UTC day). schema: type: integer Retry-After: description: Seconds to wait before retrying. schema: type: integer schemas: BuildingCompany: type: object properties: company: $ref: '#/components/schemas/CompanySummary' roles: type: array items: type: string enum: - occupant - owner description: >- `occupant`: an establishment of the company is located in the building. `owner`: the company owns property in it (land files). establishment: anyOf: - type: object properties: siret: type: string description: SIRET of the establishment in the building. headquarters: type: boolean description: True for the registered office. trade_name: description: Trade name (enseigne) of the establishment. type: - string - 'null' naf_code: description: NAF code of the establishment. type: - string - 'null' naf_label: type: string description: Label of the NAF code, in French. active: type: boolean description: False when the establishment is closed. required: - siret - headquarters - trade_name - naf_code - naf_label - active - type: 'null' description: >- Establishment through which the company occupies the building; null for an owner only. required: - company - roles - establishment description: >- A company linked to a building: a legal entity, or a sole proprietorship occupying it (registered name). Never a company under partial diffusion. PageMeta: type: object properties: page: type: object properties: next_cursor: description: >- Opaque cursor for the next page: pass it as `cursor` with the same filters. Null on the last page or once 10,000 results have been reached. type: - string - 'null' limit: type: integer minimum: -9007199254740991 maximum: 9007199254740991 description: Page size used for this response. required: - next_cursor - limit total: type: integer minimum: -9007199254740991 maximum: 9007199254740991 description: >- Number of matching results, qualified by `total_kind`. Example: 8337. total_kind: type: string enum: - exact - lower_bound - estimate description: >- `exact`: counted. `lower_bound`: at least this many (counting stopped). `estimate`: database planner estimate, can be off by a few percent. required: - page - total - total_kind description: Pagination metadata of a list response. Error: type: object properties: error: type: object properties: code: type: string enum: - UNAUTHENTICATED - FORBIDDEN - NOT_FOUND - INVALID - ZONE_REQUIRED - PAGINATION_LIMIT - RATE_LIMITED - QUOTA_EXCEEDED - TIMEOUT - BUSY - INTERNAL description: Stable machine-readable code. message: type: string description: Human-readable explanation, in English. docs_url: type: string description: Documentation page for this error code. required: - code - message - docs_url required: - error description: Error body. The HTTP status matches `error.code`. CompanySummary: type: object properties: siren: type: string description: 'SIREN: 9 digits. Example: 552100554.' name: type: string description: >- Registered name; first and last name for a sole proprietorship. Neutral label under partial diffusion ("Entrepreneur individuel"). Example: "Atelier Thermique du Rhône". naf_code: type: string description: 'NAF rev. 2 sub-class of the company. Example: "43.29A".' naf_label: type: string description: 'Label of the NAF code, in French. Example: "Travaux d''isolation".' sector: description: Gabin sector slug of the NAF code, null outside sectors. type: - string - 'null' created_on: description: Creation date (YYYY-MM-DD). type: - string - 'null' active: type: boolean description: False when the company has ceased (SIRENE state C). partial_diffusion: type: boolean description: >- True when the company is under SIRENE partial diffusion: no name of the person, address limited to the city, no position, no building, no officers. gabin_url: type: string description: Page of the company on gabin.ai. legal_form: description: >- INSEE label of the legal form, in French. Example: "SAS, société par actions simplifiée". type: - string - 'null' headcount_range: type: string enum: - '11' - '12' - '21' - '22' - '31' - '32' - '41' - '42' - '51' - '52' - '53' - NN - '00' - '01' - '02' - '03' description: >- INSEE headcount range code. "NN": not reported. See GET /v1/headcount-ranges. headquarters: type: object properties: address: type: string description: Street of the registered office; empty under partial diffusion. postal_code: description: 'Postal code. Example: "69100".' type: - string - 'null' city: type: string description: 'City. Example: "Villeurbanne".' required: - address - postal_code - city latest_revenue: description: >- Latest reported revenue, present only when results are ranked by revenue (no `q`, `insee`, `iris` or `department`). Otherwise see GET /v1/companies/{siren}/financials. In euros; null when not reported. type: - number - 'null' latest_revenue_year_end: description: Fiscal year end (YYYY-MM-DD) of `latest_revenue`. type: - string - 'null' required: - siren - name - naf_code - naf_label - sector - created_on - active - partial_diffusion - gabin_url - legal_form - headcount_range - headquarters - latest_revenue - latest_revenue_year_end description: A company in a list. securitySchemes: bearerAuth: type: http scheme: bearer description: API key `gab_live_…` or OAuth access token `gat_…`. ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.