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Unverifiable comps create liability.
Your name is on a conclusion someone else’s data has to support.
For Appraisers & Valuation Teams
Defensible comps, sourced from the people who were in the deal.
The income approach stalls on missing concession detail. CompStak Exchange gives you analyst-reviewed comps with free rent and landlord work itemized, free when you contribute your own.
Appraisal file · 400 Mandel Street
Office, Class A · income approach comps
Analyst reviewed
True buyer on file
Non-disclosure state
Lease compSFStartingFree rentLL workNER
Belobrovka Analytics42,000$82.0010 mo$95.00$75.50
Comp Advisory Group18,400$79.508 mo$80.00$73.10
Stak Capital Partners25,000$84.0012 mo$110.00$77.25
Mandel Holdings31,600$77.509 mo$88.00$71.80
Sale compClosedPricePSFCap
400 Mandel StreetApr 2025$842,000,000$679.035.10%
250 Comp PlazaJan 2025$318,400,000$611.205.35%
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What appraisers miss without verified comps.
The concession stack is hard to find.
Face rent is public. What the deal actually netted is not.
Non-disclosure states hide sale prices.
Public records stop exactly where the valuation question starts.
CompStak Exchange answers each of these with free, analyst-reviewed comps.
Join Exchange for FreeSource comps, and earn credits for the ones you have.
Find defensible comps in any market.
Search 4M+ analyst-reviewed comps on CompStak Exchange with map polygon search, True Buyer and True Seller detail, cap rates, and NOI.
Get StartedSale comp search · Gotham CBD
Office · Class A · closed since Q1 2025
PropertyPricePSFCap rateNOI
400 Mandel Street$842,000,000$679.035.10%$42,942,000
250 Comp Plaza$318,400,000$611.205.35%$17,034,000
1 Stak Tower$196,750,000$702.704.95%$9,739,000
PartyRoleDate
Stak Capital PartnersTrue BuyerApr 2025
Comp Property TrustTrue SellerApr 2025
Exchange submissions
Belobrovka Valuation Group · 2026 year to date
Comps submitted62
Comps unlocked184
Priority submissions18
Assignments29
SubmissionTypeDetailPriority
400 Mandel StreetSale comp$842,000,000 · 5.10% capHighest
250 Comp PlazaSale comp$318,400,000 · 5.35% capHighest
Belobrovka AnalyticsLease comp42,000 SF · NER $75.50Standard
Every assignment generates comps worth credits.
Submit comps from completed assignments to earn credits, with the highest values for sale comps over $20M with cap rate and NOI.
Get StartedEvery field an appraisal requires.
Access verified lease, sale, loan, and property data across major CRE asset types in 105 markets, with the details to analyze markets, value assets, and underwrite opportunities.
Net Effective Rent
Free Rent
Escalations
Tenant Improvements
+ more
Cap Rate
NOI
Price PSF
Buyer & Seller
+ more
Building Class
Size & Floor
Year Built
Landlord
+ more
Lender
Maturity Date
Origination
Loan-to-Value
+ more
Across the asset types you work with:
Office
Retail
Industrial
Multifamily*
Flex
R&D
Land*Multifamily data powered by RealPage
CRE data straight from the source.
Each comp goes through a multi-step data verification process.
400 Mandel Street, Gotham, NY
Belobrovka Analytics · Office
SizeRentTerm
400 Mandel Street, Gotham, NY
Belobrovka Analytics · Office
SizeRentTermNet effective
Verified memberReviewed on intake
One building resolvedEvery party matched
1400 Mandel Industrial PkwyHeld for review
Deal participantsProperty record
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Community Sourcing
40,000+ verified CRE professionals at brokerage and appraisal firms submit comps daily. Transaction data is received and reviewed multiple times.
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AI & Machine Learning
Machine learning and statistical anomaly detection flag figures outside the expected range for the market and building. CRE Ontology resolves the address to one building and matches every party on the deal to a verified entity. Flagged records are held for review.
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Analyst Verification
Our team of CRE research analysts review and verify data daily. They cross-check each transaction against deal participants and property records. Data is never estimated or blindly added to the system.
Submit the comps you have to get the comps you need.
CompStak Exchange is free for appraisers. Contribute the comps you already have and unlock the concession detail your income approach requires.
How other CRE teams use CompStak.
Questions about CRE comps for appraisers.
What comps does an appraisal need?
Lease comps with net effective rent, free rent, and landlord work for the income approach, and sale comps with price per square foot, cap rate, NOI, and True Buyer and True Seller detail.
How do appraisers get comps for free?
Submit the comps you have to get the comps you need. CompStak Exchange is free for appraisers who contribute comps from completed assignments.
How does CompStak verify its comps?
Every comp is processed by a multi-step data verification system, including machine learning algorithms, statistical anomaly detection, and a team of CRE data analysts. Read more about our data standard.
Does CompStak cover non-disclosure states?
Yes. Because comps come from the brokers and appraisers who were in the transaction, coverage extends to markets where public records do not carry sale prices.
How much CRE data does CompStak have?
CompStak has collected 4M+ versions of lease and sale comps across 105 US markets, contributed by more than 40,000 verified CRE professionals and reviewed by CompStak’s analyst team before they reach Exchange.