42 Floors

42Floors was a Y Combinator- and 500 Global-backed commercial real estate search platform founded in 2011 by Jason Freedman to make it easy to discover and lease office, coworking, retail, industrial, and warehouse space across top U.S. markets. It aggregated a large listings database (the "42Floors MLS") that brokers and tenants searched online. The company was acquired by Knotel in 2018, and the 42floors.com domain and listings service were later taken over by Yardi, which folded them into CommercialCafe — 42floors.com now redirects there. The only surviving developer surface is the first-party `mls` RubyGem, a client for the (now-decommissioned) 42Floors MLS API at mls.42floors.com.

42 Floors is profiled on the APIs.io network. Tagged areas include Company, Commercial Real Estate, PropTech, Real Estate Listings, and Office Space.

🌐 Visit website 📡 Source on GitHub

6.8/100 minimal ▬ flat Agent 0/100 human only Full breakdown ↓
scored 2026-09-10 · rubric v0.20.0

0 APIs

Company Commercial Real Estate PropTechReal Estate ListingsOffice Space MLS Acquired

Kin Score

Kin Score How this is scored →
scored 2026-09-10 · rubric v0.20.0

Composite quality — 6.8/100 · minimal

Contract Quality 0.0 / 25

Developer Ergonomics 1.4 / 20

Access Clarity 0.0 / 20

Operational Transparency 0.3 / 13

Contract Governance 0.0 / 12

Discoverability 5.0 / 10

Agent readiness — 0/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/42-floors: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Resources

Build 4

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

SourceCode

Packages

SDKs

Operate 1

Status, limits, changes, and where to get help

IssueTracker

IssueTracker

Company 1

The organization behind the API

Website

Website

Other 1

Properties that don't map to a standard resource type

ParentCompany

ParentCompany

Source (apis.yml)

aid: 42-floors
deliveryModel:
  model: unknown
  open_source: unknown
  commercial: false
  callable_host: false
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - repository-unlicensed
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - url: https://42floors.com
    status: 301
    note: declared website redirects to https://www.commercialcafe.com/ — a different registrable domain (42floors.com ->
      commercialcafe.com), possible rename or acquisition (probed 2026-09-03, roadmap#169)
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/42-floors.png
name: 42 Floors
description: 42Floors was a Y Combinator- and 500 Global-backed commercial real estate search platform founded in 2011 by
  Jason Freedman to make it easy to discover and lease office, coworking, retail, industrial, and warehouse space across top
  U.S. markets. It aggregated a large listings database (the "42Floors MLS") that brokers and tenants searched online. The
  company was acquired by Knotel in 2018, and the 42floors.com domain and listings service were later taken over by Yardi,
  which folded them into CommercialCafe — 42floors.com now redirects there. The only surviving developer surface is the first-party
  `mls` RubyGem, a client for the (now-decommissioned) 42Floors MLS API at mls.42floors.com.
url: https://raw.githubusercontent.com/api-evangelist/42-floors/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-status: acquired
x-status-note: Acquired by Knotel (2018); listings service later acquired by Yardi and folded into CommercialCafe. 42floors.com
  redirects to commercialcafe.com; the MLS API (mls.42floors.com) and docs (docs.42floors.com) return SiteNotFound.
x-backed-by:
- 500-global
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-17'
tags:
- Company
- Commercial Real Estate
- PropTech
- Real Estate Listings
- Office Space
- MLS
- Acquired
apis: []
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: ParentCompany
  url: https://apis.io/providers/knotel/
  name: Knotel
  x-relationship: acquired
  x-evidence: The company was acquired by Knotel in 2018, and the 42floors.
- type: IssueTracker
  url: https://github.com/42floors/mls-gem/issues
- type: Website
  url: https://42floors.com
- type: GitHubOrganization
  url: https://github.com/42floors
- type: SourceCode
  url: https://github.com/42floors/mls-gem
- type: Packages
  url: packages/42-floors-packages.yml
- type: SDKs
  url: packages/42-floors-packages.yml
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence

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