CoStar Login: Sign In, Troubleshooting, and Secure Account Access Guide
The CoStar login portal is a critical access point for commercial real estate professionals and analysts who rely on accurate, real-time market data. CoStar’s research platform powers informed decisions across leasing, property sales, tenant analytics, and competitive benchmarking.
Whether I’m analyzing comps, reviewing tenant history, or running vacancy forecasts, logging into CoStar is the first step toward making data-driven decisions. Because the platform serves both desktop and mobile users, login reliability is crucial. This guide will walk through how to log in using a username and password, how to troubleshoot access issues, and what to do if your CoStar login is not working.
How to Access the CoStar Login Portal
Logging into CoStar is simple when using the correct access credentials and system requirements. Most users log in through their organization’s license or dedicated account.
Step-by-Step CoStar Login Instructions:
- Visit the official site: https://www.costar.com
- Click on “Login” in the top right corner
- Choose the appropriate product (CoStar, LoopNet, Apartments.com, etc.)
- Enter your CoStar login with username and password
- Complete any 2-step verification or SSO steps (if required)
- Click “Login” to access your dashboard
This login process grants full access to commercial listings, market analytics, and proprietary research tools that are only available through a CoStar subscription.
CoStar Login with Username and Password
When logging in manually, using the correct CoStar login with username and password is essential. Unlike single sign-on (SSO) platforms, most users access CoStar via standard credentials provided at signup.
Login Credential Details:
If I’ve forgotten my password or need to reset my username, I click “Forgot Username or Password” on the login page and follow the steps emailed to my registered address.
Troubleshooting: CoStar Login Not Working
It’s not uncommon for users to face access issues due to expired credentials, browser problems, or server-related errors. When my CoStar login is not working, here are the steps I follow to get back in quickly.
| Issue | Recommended Fix |
| Incorrect Username or Password | Use the reset option to recover or change login credentials |
| Session Expired or Timed Out | Refresh the page or clear browser cookies and cache |
| Login Page Not Loading | Try a different browser or switch to Incognito/Private mode |
| CoStar Login Page Down | Wait and check CoStar Status Page |
| MFA Code Not Received | Verify mobile number/email or contact support |
| “Too Many Attempts” Error | Wait 15 minutes or contact support to unlock your account |
These fixes usually resolve login issues without needing IT intervention.
CoStar Mobile Access and Login App Features
While the desktop dashboard is the most robust, CoStar also offers limited mobile access for on-the-go users. With the mobile-friendly version of the site, I can quickly review listings and comp data even while on property tours.
Mobile Access Highlights:
Note: There is currently no standalone CoStar mobile app; all access occurs via browser or third-party apps integrated with CoStar (such as LoopNet Pro).
CoStar Login Security Tips
Because CoStar contains sensitive financial and market data, login security is enforced across all user levels. These are some best practices I follow to ensure secure access:
These steps help me protect my data and ensure uninterrupted access to my account.
CoStar Account Setup & Access Provisioning
If you’re a new user, your CoStar access typically comes through your employer or firm’s administrator. CoStar does not allow self-registration for full access.
Getting Access:
After setup, I always bookmark the login page to avoid typing the URL repeatedly.
CoStar Login and Co-Star Astrology: Clarifying the Confusion
It’s important to note that some users searching for “co star login” may actually be looking for a completely different platform—Co–Star Astrology, a popular app for daily horoscopes and astrological insights.
While they share similar names, CoStar (commercial real estate analytics) and Co–Star Astrology are unrelated platforms.
Quick Comparison:
| Feature | CoStar (Real Estate) | Co–Star Astrology |
| Industry | Commercial real estate analytics | Astrology and daily horoscopes |
| Website | costar.com | costarastrology.com |
| Login Use | Market data, broker insights, listings | Personal astrology profiles |
| Audience | Brokers, investors, property managers | General mobile users, astrology fans |
To avoid confusion, make sure you’re using the correct domain and bookmark the appropriate login URL for your work needs.
CoStar Support and Contact Information
If login issues persist, I always contact CoStar’s customer service team. They provide rapid assistance with password resets, account provisioning, and dashboard errors, much like the support available through SkySlope Login for real estate professionals.
CoStar Support Options:
For firm-wide issues, I usually ask our designated CoStar administrator to escalate internally for faster resolution.
Final Thoughts
The CoStar login portal serves as the critical entry point to one of the most comprehensive commercial real estate platforms in the industry. Whether logging in with a username and password or navigating role-specific access for analysts and brokers, ensuring secure access is vital to maximizing platform utility.
With high reliability, responsive support, and flexible login options, CoStar enables seamless access to data and insights that drive smart property decisions. And when login issues arise, built-in recovery tools and professional support make troubleshooting easy and efficient.
