Commercial lease data is the foundational intelligence layer of CRE investment analysis, and it has historically been the most difficult layer to access accurately. A broker pitching a Class A office asset in Midtown Manhattan can tell you what comparable properties are asking in rent. What they typically cannot tell you, with precision, is what comparable properties are actually achieving in executed lease transactions, what concession packages (free rent, tenant improvement allowances, lease term flexibility) have been required to reach those effective rents, and how those terms have shifted over the past 24 months as the market has absorbed post-pandemic demand dynamics. According to JLL’s 2024 Office Market Technology Survey, 74 percent of institutional investors identified access to accurate executed lease comparables as the single highest-value data improvement they could make to their underwriting process. The gap between asking rent and effective rent in many CRE markets is now wide enough to materially affect underwriting accuracy, and any platform that can narrow that gap with verified transaction data delivers a direct return on investment to every user running a lease-dependent analysis. CompStak is one of the most important platforms in the CRE data ecosystem precisely because it has built its entire data architecture around this problem, aggregating verified executed lease comparable data from a broker network that no single firm or data vendor can independently replicate.
CompStak is a commercial real estate lease comparable data platform that aggregates verified executed lease transaction data from a crowdsourced network of brokers, appraisers, and other industry professionals who exchange their own deal data for access to the platform’s broader dataset. Founded in 2012 and headquartered in New York, CompStak has raised over $73 million in venture capital, with a Series C round led by Canaan Partners and participation from strategic investors including CBRE and JLL. The crowdsourced data model is CompStak’s core structural differentiator: the platform has aggregated over 10 million lease comps covering office, retail, industrial, and multifamily properties across major US markets, representing a dataset depth that neither broker networks nor traditional data vendors have been able to build through centralized collection methods. CompStak serves CRE brokers, appraisers, lenders, institutional investors, and corporate occupiers who need accurate executed lease data to underwrite transactions, establish fair value in lease negotiations, and model rent growth across portfolios. The platform operates two primary product lines: CompStak Exchange, a broker-centric exchange model where professionals trade their deal data for comp access, and CompStak Enterprise, a subscription product for institutional users who need API access and bulk data capabilities without the data contribution requirement.
CompStak occupies a category-defining position in CRE lease intelligence. No other platform has aggregated executed lease comparable data at the same depth and breadth across US commercial markets through a model that aligns broker incentives with data contribution. The CBRE and JLL strategic investment is a market endorsement from the two largest CRE brokerage firms in the world, and it validates CompStak’s data depth in the market where both firms compete for brokerage mandates. The 9AI Score of 88/100 reflects a B+ for a platform that delivers exceptional value for its primary use case, with honest recognition that the crowdsourced data model creates geographic coverage gaps and that pricing for full Enterprise access can be restrictive for smaller institutional users. 9AI Score: 88/100, Grade B+.
What CompStak Actually Does
CompStak’s feature architecture is organized around three core capabilities that address the lease comparable data problem at different levels of institutional sophistication. The comparable search and analysis engine is the platform’s most-used feature: users enter a subject property address, specify asset class and lease type parameters, and receive a ranked set of executed lease comps with deal-level detail including tenant name, space size, lease term, asking rent, effective rent, free rent concession, tenant improvement allowance, commencement date, and expiration date. The level of deal detail available on CompStak comps far exceeds what is publicly available through CoStar’s lease database, which captures headline rent but frequently omits the concession economics that determine the true cost of occupancy. The market analytics layer aggregates individual comp data into market trend reports that allow analysts to track effective rent trajectories, concession package trends, and absorption dynamics at the submarket level over customizable time periods. This aggregated view is particularly valuable for underwriting rent growth assumptions in investment models, because it grounds projections in actual executed transaction data rather than asking rent indices that can diverge significantly from effective market conditions. The enterprise data API provides institutional users with programmatic access to CompStak’s full database for integration into proprietary underwriting models, portfolio monitoring systems, and analytics applications. The Practitioner Profile for maximum CompStak value is an institutional office or retail investor, CRE lender, or appraisal firm that relies on lease comparable data for underwriting and valuation work in major US markets and needs executed transaction detail that broker-provided comps and commercial data subscriptions cannot consistently deliver.
CompStak — 9AI Score: 88/100
BestCRE.com 9AI Framework v2
The 9AI Assessment: CompStak Under the Microscope
CRE Relevance: 10/10
CompStak earns the second perfect relevance score in this review cycle because executed lease comparable data is one of the two or three most fundamental inputs in commercial real estate valuation, and CompStak is the most comprehensive independent source of that data in the US market. Every CRE transaction involving a leased asset, every appraisal of an income-producing property, every underwriting analysis for a new acquisition or refinancing, and every tenant representation assignment begins with the question of what comparable tenants are actually paying in comparable spaces. CompStak’s answer to that question has more executed transaction detail, more concession economics visibility, and more market breadth than any alternative source available to institutional CRE professionals. The CBRE and JLL strategic investments confirm that the two largest CRE firms in the world have validated CompStak’s data quality at the level of daily brokerage practice, which is the most credible possible market endorsement. In practice: for any CRE professional whose work depends on lease comparable data, CompStak is as relevant as it gets.
Data Quality & Sources: 9/10
CompStak’s data quality is grounded in a crowdsourced verification model that aligns contributor incentives with data accuracy in a way that centralized collection cannot replicate. Brokers who contribute inaccurate data receive inaccurate data in return, which creates a self-correcting quality mechanism. The platform employs a quality control review layer that checks contributed comps for internal consistency before they are published to the database, filtering out obvious data entry errors and outliers that would contaminate market analyses. The resulting dataset is more accurate for effective rent and concession economics than CoStar’s lease database, which relies primarily on public filings and broker-voluntary contributions without the same exchange incentive structure. Data quality is strongest in markets with high broker density and active CompStak Exchange participation, which corresponds roughly to major gateway markets where office and retail transaction volume is highest. Quality thins in smaller markets and industrial submarkets where broker participation is lower. The one-point deduction reflects the inherent limitations of a crowdsourced model: data density varies by market, and coverage of very recent transactions can lag real-time market conditions by 30 to 60 days as contributors upload their deals. In practice: CompStak’s data quality for office and retail lease comparables in major markets is the highest available through any subscription platform.
Ease of Adoption: 8/10
CompStak Exchange has an onboarding dynamic that is distinct from most SaaS tools because it requires data contribution as a condition of access, not just payment. Brokers and appraisers who do not have a pipeline of executed deals to contribute face a cold-start problem where they cannot access comps until they have contributed comps, which creates an adoption barrier for new market entrants and practitioners with lower deal volume. For established brokerage teams with active deal flow, this barrier is low: a team closing two or three leases per quarter generates sufficient contribution volume to access the database broadly. The Exchange model’s contribution requirement effectively self-selects for users who are active practitioners with genuine deal flow, which improves the overall data quality but limits adoption among research analysts, corporate occupiers, and investors who are heavy consumers of comp data but light contributors. CompStak Enterprise addresses this barrier by offering subscription access without the contribution requirement, though at a price point that reflects the elimination of the exchange dynamic. In practice: CompStak’s ease of adoption is high for active brokers and appraisers and moderate for data-consumer users who access through Enterprise subscriptions.
Output Accuracy: 9/10
CompStak’s output accuracy for individual lease comps is the platform’s standout strength. The deal-level data includes fields that are simply not available through any other platform at comparable breadth: effective rent, free rent period (in months), tenant improvement allowance per square foot, lease commencement date, expiration date, tenant name, and space size are all captured at the transaction level rather than being estimated from asking rent indices. This granularity means that a user comparing CompStak effective rent data against a broker’s rent analysis is working from apples-to-apples transaction data rather than making judgment-based adjustments from published asking rents. The aggregated market analytics outputs (submarket rent trend reports, concession package trend analyses) are accurate representations of the underlying transaction database and provide reliable inputs for investment underwriting assumptions. The accuracy limitation worth noting is that contributor-reported data is only as accurate as the contributors’ deal records, and deals with complex economic structures (percentage rents, revenue-sharing arrangements, non-standard concession packages) may be simplified in the contribution process. In practice: CompStak’s individual comp data accuracy is the highest in the category for office and retail markets in major US metros.
Integration & Workflow Fit: 9/10
CompStak’s integration architecture covers the full range of institutional CRE workflow contexts. The web application provides a search-and-download interface that allows analysts to pull comp sets directly into Excel for incorporation into underwriting models without reformatting work. The Enterprise API provides programmatic access to the full database for teams that want to build CompStak data directly into their proprietary analytics and underwriting templates, eliminating the manual comp collection step entirely. The API integration is particularly valuable for lenders and institutional investors with large acquisition teams who underwrite similar assets repeatedly: a once-built integration that automatically pulls relevant comps for new subject properties saves hours of research time per deal. Integrations with major CRE technology platforms including Argus, CoStar, and third-party underwriting tools allow CompStak data to flow into established workflows without requiring manual data entry. The platform’s mobile interface gives brokers the ability to access comps during property tours and client meetings, which is a practical workflow benefit that market data platforms with desktop-only interfaces cannot provide. In practice: CompStak’s integration depth is strong across both individual analyst and enterprise API use cases, with the web-to-Excel download path being the most commonly used and the API integration being the highest-value path for large institutional teams.
Pricing Transparency: 7/10
CompStak’s dual-product model creates a two-tier pricing dynamic that is partially transparent. The Exchange model has no cash subscription cost but requires data contribution, which is a form of pricing that is explicit in its structure but difficult to compare against cash alternatives. Enterprise pricing is not published and operates on a custom contract model. Based on available market intelligence, Enterprise subscriptions for institutional users range from approximately $15,000 to $100,000 annually depending on geographic coverage, API access, and user count. The ROI case for Enterprise subscribers is strong: a single underwriting error prevented by accurate comp data can generate multiples of the annual subscription cost, and the time savings from automated comp collection via API justify significant subscription investment at institutional deal volumes. The pricing deduction reflects the absence of any published Enterprise price guidance and the opacity of the Exchange contribution-versus-access economics for practitioners evaluating the platform for the first time. In practice: CompStak pricing is reasonable for the data quality it delivers, but the lack of transparency creates unnecessary friction for practitioners doing initial ROI assessments.
Support & Reliability: 9/10
CompStak’s support infrastructure reflects its positioning as an institutional data platform with enterprise clients who have zero tolerance for data reliability failures. The platform’s uptime record is strong, and the data contribution and quality control workflows are sufficiently automated that the platform does not require manual intervention to maintain data freshness. Customer support for Enterprise clients includes dedicated account management and technical support for API integrations. The Exchange model benefits from a community aspect where active broker participants help newer contributors understand how to submit data effectively, which supplements the platform’s formal support infrastructure. Data reliability, meaning the consistency and accuracy of the underlying dataset over time, is managed through the quality control review layer and the self-correcting incentive structure of the exchange model. In practice: CompStak’s support and reliability profile is appropriate for institutional use cases where data availability and accuracy are critical inputs to time-sensitive investment decisions.
Innovation & Roadmap: 9/10
CompStak’s innovation roadmap is focused on applying AI to the lease comp dataset to generate analytical outputs that go beyond the comp search use case that has anchored the platform since its founding. The most significant roadmap initiative is AI-powered rent forecasting that uses the historical executed lease database to generate submarket-level rent growth projections grounded in actual transaction trends rather than asking rent extrapolations. This capability would make CompStak a forward-looking analytics platform rather than a historical data archive, significantly expanding the platform’s value for investment underwriting and portfolio monitoring. The expansion of coverage into industrial and life science lease comps, where the crowdsourced exchange model is less developed but demand from institutional investors is high, represents a market expansion opportunity that the platform has been building toward. The CBRE and JLL strategic relationships create opportunities for data sharing arrangements that could improve coverage depth and freshness beyond what the independent exchange model generates. In practice: CompStak’s innovation trajectory is well-aligned with the direction institutional CRE analytics is moving, with AI-powered forward analytics representing the most significant value expansion opportunity.
Market Reputation: 9/10
CompStak has established the strongest market reputation in the CRE lease comparable data category over its 12-year operating history, with a user base that includes most major institutional CRE brokerage firms, appraisal firms, institutional investors, and CRE lenders in the US market. The CBRE and JLL strategic investments are not just financial validations but operational endorsements: both firms have integrated CompStak data into their own brokerage and research workflows, which means the platform is credentialed by the two organizations that collectively execute the largest volume of commercial lease transactions in the world. CompStak has received consistent recognition in CRE technology media and has been cited in institutional research reports from CBRE, JLL, and Cushman & Wakefield as a data source for lease market analysis. The platform’s reputation is strongest in the office and retail sectors and in major gateway markets where its data density is highest. In practice: CompStak is the most credentialed lease comparable data platform in the US CRE market, with institutional validation at the highest levels of the industry.
Who Should Use CompStak
CompStak delivers maximum value for institutional CRE investors underwriting office and retail acquisitions in major US markets, CRE lenders whose loan underwriting depends on accurate effective rent documentation, appraisal firms that need executed comparable data for USPAP-compliant valuations, tenant representation brokers negotiating leases in active markets where knowing actual concession economics gives clients a material advantage, and landlord leasing teams benchmarking their own lease economics against market execution. The Exchange model is ideal for brokers and appraisers with active deal flow who can contribute their own deal data in exchange for broader market access. CompStak Enterprise is the right product for institutional investors, lenders, and research teams who are heavy data consumers rather than active deal contributors and need API access for systematic data integration. Any institutional user whose underwriting process includes a manual comp collection step that consumes 2 or more hours per deal should evaluate whether CompStak’s automated comp delivery can recover that time at a cost that is justified by the saved labor.
Who Should Not Use CompStak
CompStak is not the right tool for CRE operators whose portfolio is concentrated in industrial, multifamily, or hospitality assets, where the platform’s lease comp coverage is thinner and purpose-built alternatives deliver better data quality for those asset classes. Practitioners operating exclusively in smaller secondary and tertiary markets where CompStak’s Exchange participation is limited will find coverage gaps that undermine the platform’s core value proposition. Single-transaction buyers who close one or two deals per year will struggle to justify Enterprise pricing against infrequent use, and the Exchange model’s contribution requirement may not be practical for practitioners with low deal volume. Pure property managers with no investment underwriting or leasing function have limited use cases for lease comparable data regardless of source.
Pricing Reality Check
CompStak Exchange has no cash subscription cost for practitioners with active deal flow: access is earned through contributing executed lease data from the user’s own transactions. The practical cost is the time to submit each deal (typically 10 to 15 minutes per transaction) and the acceptance that deal details will be shared with other platform participants. CompStak Enterprise pricing is not published. Based on available market intelligence, enterprise subscriptions range from approximately $15,000 to $100,000 annually depending on geographic market coverage, API access, and user count, with institutional licensing arrangements for large organizations potentially exceeding these ranges. The ROI case for Enterprise subscribers is strongest at scale: a 10-deal-per-year acquisition team that recovers 2 hours of comp research time per deal at $75 per analyst hour generates $1,500 in annual time savings, which does not justify $50,000 in Enterprise costs. But for a team underwriting 100 deals per year, the same time recovery generates $15,000 in savings, the accuracy improvement value is exponentially higher given the deal volume, and the Enterprise investment is clearly justified. The API integration ROI case is the most compelling: a one-time integration investment that eliminates manual comp collection from every future deal compounds its value with each transaction.
Integration and Stack Fit
CompStak integrates into CRE analytics workflows at both the individual analyst level and the enterprise platform level. The web application’s comp search and Excel export function provides a clean manual integration path that requires no technical work beyond downloading and reformatting the export. The Enterprise API provides JSON-formatted data access that integrates with any analytics platform, underwriting model, or business intelligence tool capable of consuming a REST API. Published API integrations include Argus Enterprise, CoStar, and several institutional CRE technology platforms. The platform’s geographic coverage filters allow API queries to be scoped to specific markets, submarkets, asset types, and lease date ranges, providing the data specificity needed for programmatic underwriting automation. For CRE lenders managing large loan portfolios, the API integration with portfolio monitoring systems allows ongoing tracking of comparable market rent trends against the rent assumptions embedded in existing loan files, generating early warning signals for properties where market conditions have diverged from underwriting. In practice: CompStak’s integration architecture is one of the most complete in the CRE data category, covering both the manual analyst workflow and the enterprise automation use case.
Competitive Landscape
CompStak competes in the CRE lease comparable data category against CoStar’s lease database, CBRE’s proprietary comp systems, and broker-maintained comp sharing networks. CoStar’s lease database is broader in coverage but shallower in transaction detail, capturing asking rents and basic lease parameters more reliably than effective rent and concession economics. CBRE and JLL maintain proprietary comp databases built from their own transaction flows that are superior to CompStak within their own deal networks, but these databases are not available to external users, which is precisely why both firms made strategic investments in CompStak: they need the market data CompStak provides for their own clients’ transactions that do not flow through their own brokerage relationships. Broker-maintained comp sharing networks (the informal arrangements that exist within most major markets) are the most accurate source of very recent local market data but have no systematic organization, search capability, or analytical layer. CompStak’s primary structural moat is the aggregation of data from across competing brokerage firms into a single searchable database, which no individual firm or informal network can replicate. The competitive threat from CoStar expanding its transaction detail capture and from AI-powered lease abstraction tools (which can extract lease economics from lease documents at scale) represents the most significant medium-term competitive pressure on CompStak’s differentiation.
The Bottom Line
Accurate executed lease data is not a nice-to-have in institutional CRE. It is a prerequisite for underwriting that reflects market reality rather than market aspiration. CompStak has built the most comprehensive independent database of executed lease comparables in the US market through a crowdsourced exchange model that aligns broker incentives with data contribution in a structurally durable way. The CBRE and JLL strategic investments validate the platform’s data quality at the highest levels of institutional practice. At a 9AI Score of 88 and a B+ grade, CompStak is one of the highest-confidence recommendations in this review series for institutional CRE users whose work depends on office or retail lease comparable data in major US markets. The platform’s innovation roadmap, pointing toward AI-powered rent forecasting and expanded industrial and life science coverage, suggests the platform’s value will compound over the coming years as the dataset deepens and the analytical layer matures.
For family offices and institutional investors running lease-dependent underwriting across diversified CRE portfolios, access to verified executed lease data through a platform like CompStak represents a meaningful analytical edge over buyers relying on asking rent indices and broker-provided comps. BestCRE tracks AI and data intelligence tools across all 20 CRE sectors, including the office market bifurcation thesis and the data infrastructure platforms enabling institutional-grade analysis.
BestCRE.com is the definitive intelligence platform for commercial real estate AI, market analysis, and investment strategy. Our 20 CRE Sectors hub covers every major asset class with institutional-quality research designed for brokers, syndicators, and allocators navigating the AI era of commercial real estate.
Frequently Asked Questions: CompStak
What is CompStak and how does it work for commercial real estate professionals?
CompStak is a commercial real estate lease comparable data platform that aggregates verified executed lease transaction data from a crowdsourced network of brokers, appraisers, and CRE professionals through an exchange model. Contributors upload their own executed deal data in exchange for access to the platform’s broader database of over 10 million lease comps covering office, retail, industrial, and multifamily properties across US markets. Founded in 2012, CompStak has raised over $73 million in venture capital and received strategic investments from CBRE and JLL, the two largest CRE brokerage firms in the world. The exchange model creates a self-reinforcing quality incentive: contributors who upload inaccurate data receive inaccurate data in return, which aligns participation incentives with data accuracy in a way that centralized collection methods cannot replicate. The platform covers deal-level lease transaction details including effective rent, free rent concessions, tenant improvement allowances, lease term, tenant name, and space size, providing the transaction economics visibility that asking rent indices and traditional commercial data subscriptions cannot deliver.
How does CompStak’s effective rent data improve CRE underwriting accuracy?
The gap between asking rent and effective rent has widened significantly in many CRE markets since 2020, particularly in office markets where landlord concession packages (free rent periods, tenant improvement allowances, flexible term structures) have expanded dramatically to maintain occupancy in the face of demand uncertainty. An underwriter relying on CoStar asking rent data for a suburban office acquisition in 2024 might assume rents of $35 per square foot, while CompStak’s effective rent data for comparable executed leases in the same submarket shows effective rents of $28 per square foot after accounting for 12 months of free rent and $80 per square foot in tenant improvement allowances. The underwriting error from ignoring the concession package is material: it affects both the revenue assumption and the required capital expenditure for releasing vacant space, with compounding effects on projected returns. According to JLL’s 2024 Office Market Technology Survey, 74 percent of institutional investors identified access to accurate executed lease comparables as the single highest-value data improvement available to their underwriting process. CompStak addresses this specific gap with verified transaction-level data.
What is the difference between CompStak Exchange and CompStak Enterprise?
CompStak Exchange is the platform’s broker and appraiser-centric product, accessible without a cash subscription fee in exchange for contributing executed lease data from the user’s own transaction activity. Exchange users earn credits for each comp they contribute, which they spend to access comps from the broader database. The model works best for active practitioners who close multiple deals per quarter and can generate a consistent contribution stream that supports broad market access. CompStak Enterprise is a paid subscription product designed for institutional users, including investors, lenders, and research teams, who are primarily data consumers rather than active deal contributors. Enterprise subscriptions provide full database access, API integration capabilities, bulk data export, and dedicated support without requiring ongoing data contribution. Enterprise pricing is customized based on geographic market coverage, API access scope, and user count. The choice between Exchange and Enterprise depends primarily on the user’s contribution capacity: active brokers and appraisers with steady deal flow should start with Exchange, while institutional investors and lenders with high data consumption but limited deal contribution should evaluate Enterprise pricing against their annual comp research labor cost.
Where is CompStak’s data coverage strongest and where does it have limitations?
CompStak’s data coverage is strongest in major US gateway markets where broker participation in the Exchange is highest and transaction volume generates consistent data contribution. Manhattan, Los Angeles, Chicago, Boston, Washington DC, San Francisco, Dallas, and Atlanta represent the markets with the deepest comp databases and the most reliable effective rent data. Office and retail lease comps are the most comprehensively covered asset classes, reflecting the Exchange model’s strongest adoption among office and retail leasing brokers. Coverage in secondary and tertiary markets is adequate for general market trend analysis but thinner for specific comparable analysis at the transaction level. Industrial lease comp coverage has expanded but remains less comprehensive than office and retail in most markets, and life science and lab lease comp coverage is an emerging capability rather than a mature data layer. Multifamily coverage is limited compared to purpose-built multifamily platforms like Enodo. Users evaluating CompStak for specific geographic markets or asset classes should request a market data density review for their specific coverage needs before committing to an Enterprise subscription.
How can institutional investors and lenders access CompStak and integrate it into their workflows?
Institutional investors and lenders should access CompStak through the Enterprise product, available at compstak.com, which provides full database access, API integration, and bulk data export without the contribution requirement of the Exchange model. The onboarding process for Enterprise involves a needs assessment conversation with CompStak’s institutional sales team to configure geographic coverage, API access scope, and user permissions. For teams planning API integration, CompStak provides comprehensive API documentation and implementation support that allows data to flow directly into existing underwriting models, portfolio monitoring systems, or analytics platforms. The most efficient integration path for acquisition teams is a direct API connection to the team’s underwriting template that automatically pulls relevant comps for new subject properties, eliminating the manual comp research step from the deal process. Lenders with large loan portfolios benefit from API integration into portfolio monitoring systems that compare current market comp trends against the rent assumptions in existing loan files. CompStak pricing for Enterprise is customized based on coverage and access requirements, and prospects should budget for a structured negotiation process rather than expecting published rate cards.
Related Coverage: BestCRE 20 Sectors Hub | Cherre Review: Real Estate Data Intelligence | Best CRE Office: Bifurcation, Not Recovery
