CompStak

CompStak is a commercial real-estate data service covering lease, sale, loan, and property transactions. It is aimed at brokers, lenders, investors, appraisers, owners, and teams building CRE analysis into their workflows. The best reason to choose it is the combination of analyst-reviewed comps and integration options; the main caution is that the richest tools require paid access or contributed data.

Overview

Founded in 2011, CompStak operates as an independent, privately held CRE transaction-data company. Its records are sourced from verified commercial real-estate professionals and reviewed by CompStak’s data experts. Coverage spans major CRE asset types in 105 markets, with daily data freshness and support for both exports and API access.

Key features

CompStak Exchange is the free entry point, but it is reciprocal rather than an unrestricted public database: contributors submit deals to unlock access to comps. In return, teams get shared comp storage, market-trend views, rent heat maps, alerts, and prospecting tools focused on lease activity and expirations. That setup suits active brokers and other professionals able to contribute transactions; it is less suitable for a research group that only wants to consume data.

The underlying records contain fields that matter in underwriting. Lease comps may include net effective rent, free rent, tenant improvements, and escalations. Sale records may include cap rate, NOI, buyer and seller, and price per square foot. Those details support valuation and negotiation work more effectively than a database limited to asking rents or headline sale prices.

CompStak One adds analytics, portfolio analysis, an AI Market Summary, and natural-language comp search through CompScout. Rent Predictor estimates starting rent for office and industrial space, including vacant and newly built space, using the building, competitive set, square footage, and floor. These tools are more relevant to asset managers, owners, lenders, and investment teams than to occasional comp lookups.

Agent Connect is an MCP server for bringing verified CompStak data into AI tools such as Claude, Gemini, ChatGPT, and Copilot alongside internal data. For product and data teams, CompStak also offers APIs, bulk feeds, and custom MCP delivery for applications, models, warehouses, and workflows. API coverage includes market insights, property insights, space insights, and property standardization and matching.

Pricing

CompStak uses a freemium model. CompStak Exchange costs free and provides free access when users contribute comps. Its value depends on whether your organization can participate in that exchange; it is not a conventional no-obligation trial of every feature.

CompStak One has custom pricing and includes verified CRE data, analytics, portfolios, and CompScout. It is the more appropriate tier for teams that need broad research and analysis rather than exchange participation alone. CompStak One Connect also has custom pricing and combines CompStak One features with Rent Predictor and Agent Connect (MCP), making it the logical option when AI-assisted workflows or rent estimation are central requirements.

Paid access starts at $199.99/mo (annual). The published plans do not state seat quotas, usage caps, trial duration, or renewal terms, so buyers should confirm those commercial conditions before committing. The free Exchange is the clear low-cost starting point, while the paid tiers are aimed at organizations that need deeper data, portfolio analysis, or system integration.

Platforms

CompStak is available on the web and through an API. Bulk feeds and custom MCP delivery extend access into data warehouses, applications, models, and internal workflows rather than limiting use to the browser.

Who it's for

The audience includes brokers, appraisers, lenders, asset managers, owners and operators, private-equity firms, CMBS investors, consultants, government agencies, and universities. It is particularly well matched to professionals who need transaction-level evidence for valuation, underwriting, portfolio review, or prospecting, and to technical teams that want CRE data embedded in software or AI tools. A casual user seeking a broad, non-contributing free directory will find the Exchange model restrictive.

Pros and cons

Pros

• Detailed transaction fields: lease and sale records can include the financial and counterpart details needed for serious underwriting.
• Analyst review: data supplied by verified CRE professionals is reviewed by real-estate data experts, adding a quality-control layer.
• Multiple delivery paths: web, API, bulk feeds, exports, and MCP options support both analysts and engineering teams.
• Useful workflow tools: shared comps, alerts, heat maps, prospecting, portfolio analysis, and natural-language search cover research through monitoring.

Cons

• Free access requires contribution: Exchange is best for participants who can submit deals, not purely one-way researchers.
• Core paid tiers use custom pricing: budgeting requires a sales conversation, with no published seat or quota terms.
• Advanced capabilities are fragmented by tier: analytics, Rent Predictor, and Agent Connect are not part of the free Exchange.

Alternatives

VCPeer is a better fit for venture-oriented public searching, with a free tier offering 30 signed-in Ask answers per day, advanced filters, comparisons, one watchlist, and three saved searches, while exports are excluded.

Venture Intelligence suits readers who want a weekly deal and market-development roundup or a subscription database rather than CRE transaction comps.

Capital Radar is preferable for fundraising signals and briefing-style market intelligence; its free Radar Brief includes a weekly briefing, selected signals, and one chart or map.

FindFunding.vc is a free, open-source database for straightforward funding discovery.

FundComb is a stronger choice for unrestricted investor search, public profiles, and ranked lists, with no account or data limits on its free offering.

GPCA Data Room + LP Intelligence fits GPCA member firms needing complimentary, unlimited access and unlimited logins.

Harvey Knight Family Office VC Database is suited to users seeking a free family-office VC list with 581 offices and CSV export.

InvestorDatabase.org offers a free directory without access limits, though bulk download is not included.

Verdict

Choose CompStak if you need verified CRE transaction evidence, analyst-reviewed comp quality, and a path from browser research to APIs or AI-connected workflows. Exchange is a sensible starting point for contributors, while One and One Connect serve organizations needing analytics, portfolios, rent estimates, or MCP integration. Look elsewhere if you want a purely free, non-contribution database or a simple investor directory rather than detailed commercial-real-estate data.