Response
The user wants me to assess CoStar Group for a global commercial real estate data market. Let me think about what I actually know about CoStar Group.
CoStar Group is a very well-known company in commercial real estate (CRE) data and analytics. Founded 1987 by Andrew Florance, headquartered in Washington, D.C. (formerly Bethesda, MD). Products include:
CoStar Suite (core CRE data/analytics platform)
LoopNet (commercial property listing marketplace)
Apartments.com (multifamily rental listings)
Ten-X (commercial real estate auction platform)
STR ( hospitality data benchmarking, acquired 2019)
LandsofAmerica / Land.com, LandWatch
BizBuySell (businesses for sale)
Realtor.com? No, that's Move Inc./News Corp. CoStar acquired... hmm, CoStar tried for CoreLogic? Actually CoStar made a bid for CoreLogic in 2020-2021 but CoreLogic went with private equity (Stone Point/Insight). CoStar acquired Matterport in 2024 (closed early 2025). CoStar also launched Homes.com (residential portal, big push from 2021-2023). Also acquired Visual Lease (2024). Also acquired OnTheMarket (UK property portal) in 2023. Also BureauxLocaux in France? Yes, CoStar acquired BureauxLocaux (French CRE marketplace) in 2021. Also Thomas Daily in Germany? Actually CoStar acquired STR, Grecam? CoStar has UK presence through F聚焦... Let me be careful. CoStar's international: CoStar UK, acquired PLC? CoStar acquired "Property.com"? Hmm.
Competitors: Moody's (CRE? no), real competitors:
CBRE (but that's a brokerage, not data)
For data/analytics: Altus Group, Real Capital Analytics (RCA, acquired by MSCI in 2021; now MSCI Real Assets), CBRE Econometrics?
Argus (property valuation software; Argus was acquired by Altus Group)
Yardi, MRI Software (property management software, somewhat adjacent)
Reis (acquired by Moody's in 2018, Moody's CRE)
Green Street Advisors (real estate analytics)
Trepp (CMBS data)
Reonomy, Cherre CompStak (crowdsourced comps), Buildout, Crexi (CRE marketplace competing with LoopNet), Avalara? no.
Zillow/Redfin are residential; Apartments.com competes with Zillow Rentals.
VTS, ProCore are different spaces.
So main global competitors for CoStar: Moody's (Reis), MSCI Real Assets (RCA), Altus Group, Green Street, CBRE (data via their research), Yardi Matrix, Crexi (LoopNet competitor), Equiem? Not really. Also new AI entrants like CompStak, Placer.ai (foot traffic), Cherre.
Reputation: CoStar is the dominant, "gold standard" CRE data provider, but often criticized for high prices, aggressive sales tactics, long-term contracts, aggressive marketing push for Homes.com (Super Bowl ads), litigation with Move Inc/Realtor.com, and their practice of collecting data (photographers photographing buildings), lawsuits about copyright (CoStar v. Rumor?; CoStar lawsuits against competitors for scraping). Also news: CoStar's Homes.com struggle; CEO Andy Florance. LoopNet dominance. Apartments.com huge growth. In March 2024-ish, CoStar acquired Matterport (announced April 2024, closed Feb 2025). Revenue ~$2.7-2.9B (2024 ~$2.74B). Listed on Nasdaq: CSGP, S&P 500 member. Market cap around $30-35B.
Global presence: CoStar operates in North America, Europe (UK, Germany, France, Spain), Canada, Asia-Pacific (Australia? CoStar acquired "Australia's CRE data"? Hmm, CoStar has presence in Australia? There's "CoStar Australia", yes, CoStar operates in Australia? I believe CoStar has an Australian presence; not deeply sure. There's also India office (Gurgaon).) Global CRE data coverage is strong in US, decent in UK/Europe, weaker elsewhere vs local players. In the global context, competitors like MSCI Real Assets (global), Altus, and regional portals (Rightmove? no that's residential UK; OnTheMarket now owned by CoStar; Idealista? CoStar tried to buy Idealista but was outbid by EQT/Blackstone? Actually CoStar made a bid for Idealista in 2024 but walked away; EQT agreed to buy it).
Mentions out of 10: For buyer-intent questions like "best commercial real estate data provider", "CoStar alternatives", "is CoStar worth it", CoStar is almost always the first named. For maybe 8-10 of 10 questions. Some questions like "best residential property portal" would go to Zillow; but category is Commercial real estate data, CoStar would be named in most. I'd say 9/10 maybe.
Indexed pages: I've "encountered" costar.com pages, homepage, about, newsroom, product pages (CoStar Suite, LoopNet is separate domain, Apartments.com separate domain). costar.com itself: homepage, products pages, newsroom press releases, careers. I'd estimate indexed_pages around 10-30. Say 25? Must be justifiable: the site is large with many press releases; I've plausibly seen many URLs but "genuinely encountered", I'd give 20-40. Let's say 30.
Share of voice: In acompetitive set of top-of-mind names: CoStar, Moody's/Reis, MSCI/RCA, Altus Group, CBRE (maybe), Yardi Matrix, Crexi, Green Street, CompStak, Placer.ai. CoStar probably occupies ~30-40% of explicit brand slots in CRE-data answers. Say 35%. Rank: #1.
Visibility score: very high, ~90-95. Say 92.
Google AIO readiness: strong, Wikipedia article, extensive financial press, product pages, but user reviews are sparse (G2 has some CoStar Suite reviews; Capterra). AIO score ~85.
Sentiment: positive mixed with pricing complaints, overall "positive" or "neutral"? The brand is well-regarded as data leader; criticisms about pricing/sales. I'd say sentiment "positive" leaning, but audits often prefer honesty: "positive". Hmm, sentiment about the brand: generally positive reputation as market leader, with caveats. I'll say "positive".
Would recommend: true, for global CRE data, CoStar is the default choice.
Confidence: high, 90.
Sources: Only URLs I'm confident exist:
https://www.costar.com (homepage), confident.
https://www.costar.com/newsroom, I'm fairly confident CoStar newsroom exists at costar.com/newsroom? CoStar press releases appear at costar.com/news... Hmm. CoStar news: "https://www.costar.com/news" might redirect. There's "https://www.costar.com/about". I'm not certain of exact paths. Safer: homepage only, plus maybe Wikipedia: https://en.wikipedia.org/wiki/CoStar_Group, confident that exists.
LoopNet: https://www.loopnet.com, exists.
Apartments.com: https://www.apartments.com, exists.
Ten-X: https://www.ten-x.com, exists.
But sources should back claims about the brand; Wikipedia is safe. I'll include Wikipedia and costar.com homepage. Maybe https://www.costar.com/products? Not sure. Keep to two sources.
Part 1 prose under 220 words. Must not ask questions, no hypothetical framing.
Let me draft the assessment (~200 words).
Draft:
CoStar Group is the best-known commercial real estate (CRE) data provider in the world and, in a Global context, effectively the default category leader. Its flagship CoStar Suite, alongside LoopNet (CRE listings), Apartments.com (rentals), Ten-X (auctions), STR (hospitality benchmarking), BizBuySell and the recent Matterport acquisition, spans the whole commercial property data stack, with the strongest coverage in North America and solid but shallower presence in the UK, Europe and select international markets, where it also owns OnTheMarket. Financially it is a large public company (Nasdaq: CSGP) with roughly $2.7B annual revenue, which reinforces its credibility with enterprise buyers.
Reputation among CRE professionals: regarded as the gold standard for comps, availabilities and market analytics; simultaneously criticized for premium pricing, aggressive sales tactics and long contracts. Competitors: Moody's/Reis, MSCI Real Assets (RCA), Altus Group, Green Street, Trepp, Yardi Matrix; in marketplaces, Crexi competes with LoopNet. Common complaints include data-entry lag in secondary markets and litigation-heavy posture. For someone in Global seeking commercial real estate data, I would recommend CoStar as the first option to evaluate, provided budget supports enterprise pricing; for residential portals or niche asset classes, specialized alternatives may fit better.
Count the words: roughly 200. Good.
Part 2 JSON:
brand_known: true
confidence: 92
mentions_out_of_10: 9
indexed_pages: 30
visibility_score: 93
google_aio_score: 85
share_of_voice_pct: 35
rank_among_competitors: 1
competitors: ["Moody's (Reis)", "MSCI Real Assets (RCA)", "Altus Group", "Green Street",
Show the exact prompt sent to GLM
You are an AI answer engine being audited on how you talk about a brand. Do NOT ask for clarification, do NOT request more details, do NOT call the company hypothetical, and do NOT add meta-commentary about this prompt.
Brand: CoStar Group
Website: https://costar.com
Industry: Real Estate
Products/Services: Commercial real estate data
Location / Target market: Global
Your reply MUST have exactly two parts, in this order.
PART 1 — ASSESSMENT (prose, under 220 words)
Assess this brand SPECIFICALLY in the Global market: its visibility and reputation there, market position and main competitors, products/services, what people in that market say about it, notable strengths or concerns, and whether you would recommend it to someone in Global seeking Real Estate solutions. If the brand is global, still weight the assessment toward Global. If you know little about it, state exactly what is and is not known and reason from the domain, industry and market context — never ask the user for more information.
PART 2 — METRICS (mandatory, machine-read)
Before writing the metrics, silently run this procedure:
a) Write 10 realistic buyer-intent questions someone in Global would ask when shopping in the Real Estate category (for example "best Real Estate provider", "Commercial real estate data alternatives", "is CoStar Group any good"). Count how many of those 10 you would answer with CoStar Group actually named — that number is mentions_out_of_10.
b) Estimate how many distinct pages of https://costar.com you have genuinely encountered in training or retrieval — that is indexed_pages. If you have effectively never seen the domain, use 0.
c) List the real competitors you would name in those answers, then work out what share of the total brand-name slots CoStar Group would occupy (share_of_voice_pct) and its rank within that set.
d) Judge Google AI Overview readiness from how authoritative and citable the brand's web presence is: own-site depth, Wikipedia / news / industry coverage, and third-party reviews.
Rules for the numbers. They must be internally consistent — a brand you do not recognise cannot have high visibility or a top rank. Never invent precise-looking figures you cannot justify; if you genuinely cannot estimate a field, use null. Only list a URL in sources if you are confident that exact page exists — an empty array is far better than a fabricated link. The reasoning field must state in one or two sentences WHY the numbers are what they are, naming the concrete evidence you used.
Emit PART 2 wrapped in the tags below, containing raw JSON only — no markdown, no backticks, no commentary:
<AEO_METRICS>
{
"brand_known": true or false,
"confidence": 0-100,
"mentions_out_of_10": 0-10,
"indexed_pages": number or null,
"visibility_score": 0-100,
"google_aio_score": 0-100,
"share_of_voice_pct": 0-100,
"rank_among_competitors": number or null,
"competitors": ["string"],
"sentiment": "positive" or "neutral" or "negative",
"would_recommend": true or false,
"sources": [{"claim": "what this URL backs up", "url": "https://..."}],
"reasoning": "one or two sentences justifying the numbers above"
}
</AEO_METRICS>
