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Negotiating leases blind.
The tenant’s broker knows the concession package. You find out at signing.
For Owners & Operators · CompStak One Connect
Price every lease on what the building next door signed.
Tenant reps walk in knowing the comps. CompStak shows what comparable buildings actually gave in free rent and landlord work, deal by deal, before you counter.
Competitive set · Gotham CBD
5 buildings · Office, Class A · signed since Q1 2025
Class A
Gotham CBD
Your ask $84.00
| Building | Starting | Free rent | LL work | NER |
|---|---|---|---|---|
| 400 Mandel Street | $82.00 | 10 mo | $95.00 | $75.50 |
| 250 Comp Plaza | $76.50 | 8 mo | $80.00 | $70.20 |
| 1 Stak Tower | $88.00 | 12 mo | $110.00 | $79.40 |
| 900 Belobrovka Avenue | $74.00 | 6 mo | $65.00 | $69.85 |
| 55 Gotham Ridge | $79.00 | 9 mo | $88.00 | $72.60 |
Median NER$72.60
Median free rent9 mo
Median LL work$88.00
Buildings5
Trusted by the leaders in commercial real estate
What owners and operators miss without verified comps.
Vacancies linger without a tenant pipeline.
Space sits while the tenants who were about to move have already signed elsewhere.
Below-market leases go unnoticed.
Without signed-deal evidence, the leases priced under market stay hidden until they roll.
CompStak One Connect answers each of these with verified, analyst-reviewed comps.
Get StartedThe evidence behind every leasing decision.
Set leasing strategy on signed deals.
Benchmark your rents and concession packages against executed leases in comparable buildings, so asking rents, renewal offers, and concession budgets rest on what tenants actually signed.
Get StartedSigned leases · Gotham CBD
Office · Class A · leases since Q1 2025
Starting$82.00
Free rent10 mo
LL work$95.00
NER$75.50
BuildingStartingFree rentLL workNER
400 Mandel Street$82.0010 mo$95.00$75.50
250 Comp Plaza$76.508 mo$80.00$70.20
1 Stak Tower$88.0012 mo$110.00$79.40
Price the space before you counter.
Describe a vacant space in Rent Predictor, including one with no lease on file, and get the Estimated Starting Rent Today with the comps behind it.
Get StartedRent Predictor · model input
400 Mandel Street · Floor 28 · 42,000 SF · vacant
Est. starting rent today$82.00
Range$78.00–$86.00
Comps used14
Underwritten$80.00
CompSFStartingNER
Belobrovka Analytics42,000$82.00$75.50
Comp Advisory Group18,400$79.50$73.10
Stak Capital Partners25,000$84.00$77.25
Run the analysis where your team already works.
Query CompStak comps from ChatGPT, Claude, Gemini, or Copilot through the Agent Connect MCP server, and join them against your own records. Statistics and trends are free; pulling the underlying records counts toward your weekly comp limit.
Get Started“Draft a renewal counter for Floor 28 at 400 Mandel Street using the last 18 months of Class A comps.”
Estimated Starting Rent Today is $82.00/SF. Comp set NER ranges $73.10–$77.25 with 8–12 months free rent.
CompSFStartingNER
Belobrovka Analytics42,000$82.00$75.50
Comp Advisory Group18,400$79.50$73.10
Rent Predictor and Agent Connect are available on CompStak One Connect.
Ask for the leasing answer in your own words.
Agent Connect puts CompStak inside Claude, ChatGPT, Gemini, and Copilot. Ask the way you’d ask an analyst, and the work comes back with its source comps attached.
“Draft a counter to the renewal proposal at 1 Vanderbilt Avenue using what comparable buildings gave on free rent and landlord work this year.”
Returns
Counter draft + comps
“Build a leasing pipeline for 55 Hudson Yards: every tenant in its competitive set with a lease expiring in the next 18 months.”
Returns
Prospect list
“Price the vacant 12th floor at 601 Lexington Avenue and show me the comps behind the number.”
Returns
Estimated Starting Rent Today + comps
“Write a one-page market update on Midtown East office for Monday’s leasing meeting: rents, concessions, and the deals signed last quarter.”
Returns
Market update draft
Every field an owner needs to price space.
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.
See CompStak One Connect in action.
Price space and answer comp questions without leaving your workflow.
How other CRE teams use CompStak.
Questions about CRE data for owners and operators.
What lease comps do owners and operators need to price space?
Starting rent, free rent, landlord work, escalations, term, and net effective rent on comparable space in your submarket, recorded from the brokers who signed the deal.
How do my building’s leases compare with the market?
Compare your starting rents, net effective rents, free rent, and landlord work per square foot against leases signed in comparable buildings. CompStak comps are executed deals, not listings or asking rents, so the benchmark reflects real transactions.
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.
What does CompStak One Connect add for owners and operators?
Rent Predictor, which estimates the starting rent a space would achieve today even with no lease on file, and Agent Connect, which answers comp questions inside Claude, ChatGPT, Gemini, or Copilot.
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.