CoStar customer service number — how to find, use, and escalate support

Overview: who handles CoStar support and why the phone number matters

CoStar is a B2B provider (CoStar Group, Inc.) whose primary products are subscription databases and software for commercial real estate professionals. Because most accounts are enterprise or seat-based, CoStar routes most support through account teams, online ticketing and dedicated technical specialists rather than a generic public phone line. Knowing the correct customer service number — or the correct route to get a callback — reduces downtime when data feeds, mapping, or property records are critical to valuation, leasing or investment decisions.

This document explains realistic ways to obtain a verified CoStar customer service number, the alternative channels (in-app help, account manager, portal), what information you must have ready for a fast resolution, and how to escalate billing or data-quality disputes. Read through the steps and templates below before you call: preparation typically shortens average handling time from an hour to 10–20 minutes per incident.

Where to find the CoStar customer service number

CoStar’s public-facing website is the authoritative starting point: https://www.costar.com. Corporate contact pages, account portals and invoices carry the correct regional or product phone numbers. If you have a CoStar account (CoStar COMPS, LoopNet, Apartments.com vendor tools, CoStar Suite), log in first — the in-product “Help” or “Contact” link usually displays a dedicated support number for your contract and region.

If you do not have account access, use the corporate “Contact Us” page on costar.com to find sales and corporate office telephone numbers and regional offices. For urgent technical issues affecting production systems (API failures, data feed outages), request an immediate escalation through the account portal so CoStar can route you to a technical operations number or an on-call engineer.

What to have ready before you call

Preparing detailed, concrete information will speed diagnosis and resolution. For support related to property listings, comps, mapping or API integration, gather account identifiers, exact timestamps, and evidence of the issue.

• Account name and account number (as it appears on your invoice), company billing address, and the email address of the account owner.
• Exact product name (for example: CoStar Suite, CoStar COMPS, CoStar Go, LoopNet) and subscription tier if known; include the username, site role and any error codes or request IDs.
• One-line summary of the problem (e.g., “API v2 data feed returned HTTP 500 from 2025-08-29T14:03Z”), screenshots, URLs for affected items (property IDs) and the date/time(s) you observed the issue.

Phone vs. other support channels — when to call

Phone support is fastest for: billing disputes that require immediate reconciliation, outages that are preventing users from accessing mission-critical data, and contract/renewal negotiations where you need to reach an account executive. For routine data corrections (wrong square footage, tenant lists) or feature requests, opening a ticket through the portal gives a documented trail and SLA.

Typical response expectations: most enterprise B2B vendors aim to answer phone escalations within minutes during business hours and to resolve critical outages within 4–24 hours depending on severity. For non-urgent tickets expect 24–72 hours. If your organization depends on CoStar for operational workflows, add escalation contact names and phone numbers to your runbooks and negotiate a documented SLA at renewal.

Billing, pricing and cancellation considerations

CoStar pricing is typically custom and negotiated by product, seat count and contract length. Typical seat-based subscriptions for professional commercial real estate platforms commonly run from several thousand to tens of thousands USD per user per year for enterprise contracts. Your invoice will list the billing contact and a phone number for billing inquiries — use that number for disputes, refund requests or mid-term adjustments.

Canceling or changing a subscription almost always must be done in writing and often follows contract terms (many enterprise contracts auto-renew annually). To avoid unexpected charges, submit cancellation requests 30–90 days before renewal and confirm the request by email; keep the ticket/confirmation number and make a record of the billing contact and date/time of the call.

Escalation path and support best practices

When a phone call doesn’t resolve the issue, escalate in the following order: account manager → technical support lead → regional operations manager → legal/contract team. Escalation is more effective when you provide a concise incident timeline, copies of correspondence, and a business impact statement (number of users affected, estimated revenue or cost impact per hour).

• Step 1: Open or reference the support ticket number; ask for an ETA and the name of the person owning the issue.
• Step 2: If no satisfactory ETA within the promised window, request escalation to the technical lead and get their direct phone or conference bridge number.
• Step 3: For unresolved billing or contractual disputes, request escalation to the regional operations or legal contract team — state contract clause and requested remedy (credit, refund, termination).

Alternative: Co–Star (astrology app) — support differences

If you mean the consumer astrology app “Co–Star,” note the support model is different: Co–Star (consumer) does not operate a public phone support line. Instead, their support is handled in-app and via their help center and social channels. To contact them, use the in-app “Help” or the app store support link; typical response times for consumer apps are 24–72 hours.

For consumer-app issues (login, in-app purchases, push notifications), be prepared with the device model, OS version, app version, and the Apple/Google purchase receipt ID if the issue is billing-related. Consumer app disputes with Apple/Google purchases are often resolved via the platform’s purchase dispute flow rather than directly through the app publisher.