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Rigorous Data Verification

Community Sourcing

CompStak Data is crowdsourced from our trusted network of 35k+ members working at commercial brokerage and appraisal firms. We receive transactions multiple times for additional layers of verification. Our members submit updates daily to improve lease and sale transaction data.

Artificial Intelligence and Machine Learning

Intelligent algorithms remove suspicious data and improve data quality by identifying potential duplications and statistical outliers.

Internal Verification

Our commercial real estate research analysts review and verify data daily to ensure data integrity. Analysts cross-verify and add details to transaction data, deal participants, and property information.

Knowledge Graph

Our knowledge graph identifies connections between properties, transactions, and Submissions. It is continually improved by our constant flow of deal data, newly integrated data sets, and Research team data verification.

CompStak Exchange

For Brokers, Appraisers and Researchers

The world’s largest free and anonymous lease and sale comp trading platform

CompStak One

For Landlords, Lenders and Investors

Powering analysis with real-time records of CRE lease, sale, property, and loan data.

In the 10 biggest New York office deals of 2022, tenants got 7% of the lease term rent-free, compared with 3% in 2019, according to CompStak.

The Wall Street Journal

Of the five areas measured, Class A 2023 average effective rents were higher than Class B/C in all cases, according to data from CompStak.


CompStak’s more than 35,000 members deliver authenticated data encompassing all of the U.S. for CRE professionals that include appraisers, brokers and investors.


The banks’ troubles could add hundreds of thousands of square feet to markets already struggling with high vacancies, according to a report from CompStak that tracked the banks’ office footprints.

Commercial Observer

In 2021, tech firms represented 6.5 percent of South Florida office deals, and 11 percent of office square footage leased, according to CompStak.

The Real Deal

There’s no such thing as a free lunch, as most everyone knows. You have to pay for what you want. In the office leasing work, That is apparently also true according to a CompStak analysis of lease transaction data, as the cost of concessions is going up.

Globe St.