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

8.7/100 minimal ▬ flat Agent 0/100 human only Full breakdown ↓
scored 2026-07-27 · rubric v0.5

0 APIs

CompanyCommercial Real EstatePropTechReal Estate ListingsOffice SpaceMLSAcquired

Kin Score

Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5

Composite quality — 8.7/100 · minimal

Contract Quality 0.0 / 25

Developer Ergonomics 1.3 / 20

Commercial Clarity 0.0 / 20

Operational Transparency 0.7 / 13

Governance 0.0 / 12

Discoverability 6.8 / 10

Agent readiness — 0/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 15

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

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Resources

Build 4

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

SourceCode

Packages

SDKs

Company 1

The organization behind the API

Website

Website

Source (apis.yml)

aid: 42-floors
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source: []
  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: '0.20'
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: 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