Decode any brownstone
in seconds.

Paste any NYC address. Get a free DNA Score, live HPD violations, and rent comps instantly. For $29, unlock the Full DNA Report — ROI model, renovation estimate, NYC closing cost breakdown, and PDF export. No subscription.

Try: 153 Schenectady Ave 482 Jefferson Ave 741 Macon St

Free to explore.  Full DNA Report — $29. No subscription.

40K+
NYC brownstone sales/year analyzed
3hrs
saved vs. doing it manually
8+
live NYC data sources
35+
Brooklyn neighborhoods tracked
What you get

Everything you need before
you make an offer. In one place.

A brownstone inspection costs $750–$1,000. An attorney retainer starts at $1,000. The Full DNA Report gives you what both eventually produce — before you've committed a dollar. Free to explore. $29 for the full picture.

Live HPD Violation Scan
Every open and closed violation pulled from NYC HPD in real time. Class A, B, and C severity with inspection dates and remediation status.
Live data
DNA Score (0–100)
A single investment-grade risk score weighing violations, registration status, zoning, community district, and owner history.
Proprietary
10-Year ROI Model
Full mortgage, NOI, cash flow, cap rate, and equity projection across both 2-family hold and 3-family conversion scenarios.
Interactive
Hyper-Local Rent Comps
1BR/2BR/3BR median rents for 35+ NYC neighborhoods linked to live StreetEasy listings with price, sqft, and days on market.
35+ hoods
Zoning & Conversion Analysis
R6, R7, FAR headroom, LL126 eligibility, basement vs. cellar distinction — everything that determines if a 3-family conversion is viable.
ZoLa + DOB
NYC Closing Cost Breakdown
Mansion tax, RPTT, mortgage recording tax, title insurance, attorney fees, and prepaids — pre-calculated from your purchase price. Know your total cash requirement before you bid.
$29 report
How it works

From address to
investment thesis.

Four steps. Under 60 seconds. Bid confidently.

01 / ENTER
Type any NYC address
Paste an address from a listing email, StreetEasy, or a broker's sheet. We geocode it to block, lot, and BBL automatically.
02 / PULL
Live data fires in parallel
HPD violations, DOB records, NYC Planning zoning, and neighborhood rent comps load simultaneously from 8 public sources.
03 / DECIDE
Free: is it worth a showing?
Your free DNA Score and violation summary tells you if this deal deserves a closer look — or if you should pass and move on.
04 / Full DNA REPORT, $29
Go in with confidence
Unlock the complete package: 10-year ROI model, renovation estimate, NYC closing cost breakdown, and shareable PDF. Everything your attorney and inspector eventually produce — three weeks earlier.
Violation intelligence

Know exactly what
you're walking into.

Get the stuff the listing doesn't mention. Most buyers discover violations at the $1,000 inspection — after they're already in contract. BrownstoneDNA surfaces every open HPD violation, registration failure, and DOB issue before you spend a dollar.

■ Class C — Immediately hazardous   ■ Class B — Hazardous   ■ Class A — Maintenance
Class B
Owner failed to file valid registration statement with the department as required by ADM Code §27-2097
Apt — · Inspected Sep 2023
Open
Class C
No heat or hot water — failure to supply heat as required Oct 1 through May 31
Apt 1 · Inspected Nov 2024
Open
Class B
Rodent infestation — evidence of rodent activity in building common areas
Apt — · Inspected Oct 2024
Open
Class A
Paint peeling interior walls and ceiling in bathroom of apartment
Apt 2 · Inspected Nov 2020
Closed
Data sources

Built on NYC's
public record.

Every data point links back to its original public source so you can verify anything, anytime.

HPD Online
Housing Preservation & Development
All violations, building registrations, and complaint history for every NYC residential building.
Live
DOB BIS
Dept. of Buildings
Open violations, permits, job filings, and certificate of occupancy records.
Live
ZoLa
NYC Planning Labs
Zoning district, FAR limits, lot dimensions, building class, and landmark status.
Live
ACRIS
Automated City Register
Deed history, tax benefit programs (J-51, 421-a), lien records, and ownership chains.
Daily
StreetEasy
Rental Listings
Hyper-local 1BR/2BR/3BR medians and live active rental listings with price, sqft, and days on market.
Live
NYCHVS
Housing Vacancy Survey
Neighborhood-level rent trends, vacancy rates, and YoY appreciation data.
Quarterly
Plans & Pricing

One report could save you
from a $50,000 mistake.

Start free. Pay $29 when you're serious.
Subscribe when you're screening weekly.

Most popular · No account required
Full DNA Report — $29
A brownstone inspection costs $750–$1,000. An attorney retainer starts at $1,000. The Full DNA Report gives you what both eventually produce — three weeks before you get it.
  • ✓ Full HPD violations — all open and closed records
  • ✓ 10-year ROI model — editable, 2-family & 3-family scenarios
  • ✓ Renovation estimate — cosmetic and full conversion budgets
  • ✓ NYC closing cost breakdown — mansion tax, RPTT, title, attorney, prepaids
  • ✓ PDF report + XLSX export — yours to share and edit
Analyze with Full DNA Report — $29 →

Instant. No account. No subscription.

Just browsing
Free
$0
Always free · No account needed

See the DNA Score and open violations before you commit any time or money.

  • DNA Score (0–100)
  • Open violation count + severity class
  • Zoning label + LL126 eligibility
  • Neighborhood median rents (1BR/2BR/3BR)
  • No violation translation of impact
  • No ROI model or financial projections
  • No closing cost breakdown
Search free →
Most popular
First-time buyer
Full Report
$29 one-time
Per property · No subscription

Get the complete due diligence package three weeks before your attorney and inspector hand it to you.

  • Full HPD violations — plain-English explanations
  • 10-year ROI model, editable assumptions
  • Renovation estimate (cosmetic + conversion)
  • NYC closing cost breakdown + prepaids
  • PDF report + XLSX export
Analyze with Full DNA Report — $29 →
Active investor
Investor
$99/mo
Coming soon · Join waitlist

Paying $99/month makes sense the moment you're looking at more than one deal at a time.

  • Unlimited full reports
  • Violation alerts on saved properties
  • Dynamic deal filters (DNA score, cap rate, neighborhood)
  • New listing alerts matching your criteria
  • Financial modeling deep-dive
Join waitlist →
RE professional
Real Estate Pro
$249/mo
Coming soon · Join waitlist

Walk into every client meeting 10× more prepared. At $400/hr billing, this pays for itself on the first deal.

  • Everything in Investor
  • White-label PDF reports
  • Client sharing links
  • Team seats
  • Bulk property management + alerts
  • Inspection report analysis (coming)
Join waitlist →
Get started today

Your next showing is tomorrow
morning. Know before you go.

Search free. If it looks worth pursuing, unlock the Full DNA Report for $29 — ROI model, renovation estimate, closing cost breakdown, and shareable PDF.

Analyze a property → See a sample Full DNA Report →