---
title: "Sources — Class A Atlas"
description: "16 primary sources Class A Atlas uses, with last-checked dates and per-metric mapping."
canonical: https://classa.info/about/sources
pageType: about-sources
lastUpdated: 2026-05-29T16:17:29.065Z
license: "CC BY 4.0 with attribution to Class A Atlas (https://classa.info)."
---

> Class A Atlas relies on 16 dated primary sources spanning brokerage research, official statistics, rating bodies, and industry-body cost data — every source is mapped to the specific metrics it feeds.

## TL;DR

- 16 primary sources are listed and dated.
- Brokerage research, official statistics, rating bodies, and industry-body cost data.
- Every source has a 'last checked' date and a list of metrics it feeds.

# Sources

**The full list of primary sources [Class A](/glossary/class-a) Atlas relies on, organised by category. Each entry shows what we use it for and when we last checked it.**

## TL;DR

- 16 primary sources are listed and dated.
- Brokerage research, official statistics, rating bodies, and industry-body cost data.
- Every source has a 'last checked' date and a list of metrics it feeds.

## brokerage

- [**CBRE Marketview reports**](https://www.cbre.com/insights) — CBRE.*Used for:* Class A asking rent, [vacancy rate](/glossary/vacancy-rate), [net absorption](/glossary/net-absorption), submarket tiering. *Last checked:* 2026-04-01.
- [**JLL Office Insight**](https://www.jll.com/en/trends-and-insights) — JLL.*Used for:* Class A asking rent, rent-free incentive levels, [fit-out](/topics/fit-out-capex)">fit-out cost ranges. *Last checked:* 2026-04-01.
- [**Cushman & Wakefield Marketbeat**](https://www.cushmanwakefield.com/en/insights) — Cushman & Wakefield.*Used for:* Vacancy rate, lease length, concession packages. *Last checked:* 2026-04-01.
- [**Savills World Research**](https://www.savills.com/research_articles/) — Savills.*Used for:* EMEA Class A asking rent, [prime yield](/glossary/yield), trophy-asset comparables. *Last checked:* 2026-04-01.
- [**Knight Frank Global Cities and Skyscraper Index**](https://www.knightfrank.com/research) — Knight Frank.*Used for:* [Trophy asset](/glossary/trophy-asset) benchmarking, global rent comparison. *Last checked:* 2026-04-01.
- [**Colliers Global Office Outlook**](https://www.colliers.com/en/research) — Colliers.*Used for:* APAC Class A asking rent, vacancy and absorption. *Last checked:* 2026-04-01.

## official

- [**UK business-rates valuation lists**](https://www.gov.uk/government/organisations/valuation-office-agency) — Valuation Office Agency (UK).*Used for:* UK business rates input to occupancy cost. *Last checked:* 2026-03-15.
- [**US Bureau of Labor Statistics — Quarterly Census of Employment and Wages**](https://www.bls.gov/cew/) — US BLS.*Used for:* Talent index labor pool input. *Last checked:* 2026-03-20.
- [**OECD corporate tax statistics**](https://stats.oecd.org/Index.aspx?DataSetCode=Table_II1) — OECD.*Used for:* Corporate tax rate per market. *Last checked:* 2026-03-30.
- [**Corporate occupier disclosures (10-K, 20-F, annual reports)**](https://www.sec.gov/edgar/searchedgar/companysearch) — Various issuers.*Used for:* Tenant identity and floorplate occupancy at named buildings. *Last checked:* 2026-04-10.

## rating-body

- [**USGBC LEED project directory**](https://www.usgbc.org/projects) — US Green Building Council.*Used for:* LEED certification status of notable buildings. *Last checked:* 2026-04-05.
- [**BREEAM certified building register**](https://www.breeam.com/) — BRE Group.*Used for:* BREEAM certification status of notable buildings. *Last checked:* 2026-04-05.
- [**BCA Green Mark directory**](https://www1.bca.gov.sg/buildsg/sustainability/green-mark-certification-scheme) — Building and Construction Authority (Singapore).*Used for:* Singapore certification status. *Last checked:* 2026-04-05.
- [**WELL Building Standard certifications**](https://www.wellcertified.com/) — International WELL Building Institute.*Used for:* WELL certification status of notable buildings. *Last checked:* 2026-04-05.

## industry-body

- [**RICS Building Cost Information Service**](https://www.rics.org/profession-standards/research-and-publications) — Royal Institution of Chartered Surveyors.*Used for:* EMEA fit-out cost ranges by spec level. *Last checked:* 2026-03-25.
- [**Turner Construction Cost Index**](https://www.turnerconstruction.com/cost-index) — Turner Construction.*Used for:* US construction cost calibration for fit-out. *Last checked:* 2026-03-25.

## Related

- [**Methodology**](/about/methodology)
- [**Editorial standards**](/about/editorial-standards)
- [**Corrections log**](/about/corrections)

---

Citation: Source: Class A Atlas (https://classa.info/about/sources), updated 2026-05-29T16:17:29.065Z.