The Condo Book Project vs. Marketproof
Short answer: With Marketproof, you start with a sales call. With The Condo Book Project, you start searching. Marketproof doesn't publish its platform price; you ask its sales team. The Condo Book Project is free to search, and Pro has a published price you can buy online. Marketproof is built around listings and sales for the industry. We're built from the document every NYC condo starts with: the offering plan, the sponsor's (developer's) disclosure filed with the Attorney General (AG). We cover 20,776 plans, 2,658 of them in full text.
Side by Side
| The Condo Book Project | Marketproof | |
|---|---|---|
| Getting started | Search right away, no sign-up; free account in seconds | Talk to sales |
| Price | Free to start; Pro at a published price (pricing) | Platform pricing not published |
| Offering plan full text | Every plan's text searchable at once, with page citations | Not described on its public pages |
| Unit prices | Every unit's Schedule A price and price per square foot, updated for amendments | Not described on its public pages |
| Monthly costs | First-year budgets, common charges and taxes, compared with similar buildings | Not described on its public pages |
| Amendments | What every amendment changed, building by building | Not described on its public pages |
| Closings | ACRIS closings matched to each unit and its plan price | Sales and sales velocity tools |
| Subway | Walking time to the nearest subway entrance, for every building | Not described on its public pages |
| The people | Developers, architects, lawyers, managing agents, sales teams, contractors and lenders, linked across every plan | Project participants in its pipeline tracker |
| Ask in plain English | From ChatGPT or Claude | An AI connector sold by prepaid credits |
Marketproof details are from its site, help center and connector pricing as of November 2026. "Not described" means we didn't find it on its public pages.
What Marketproof Is
Marketproof is a NYC new development data platform for agents, developers and lenders. Its Pro platform covers what's on the market, when sales began, how fast buildings sell and past new development sales, and its Pipeline tracks projects from land purchase to completion. To see pricing for the platform, you contact its sales team.
What You Get With The Condo Book Project
Every new NYC condo, and every co-op sold under a plan, must file an offering plan with the Attorney General before it can sell. It's the developer's legal disclosure of what it's selling and what it will cost to own. We read the plans and connect them to everything around them:
- Prices. Every unit's price from Schedule A (the plan's price list), its price per square foot, and how amendments (later changes to the plan) moved them.
- Costs. First-year budgets, common charges and tax estimates, ranked against similar buildings (common charges, operating costs, property taxes).
- Amendments. What each one changed, so you're reading the plan as it stands today (what changes in an amendment).
- ACRIS closings. What buyers actually paid, unit by unit, against the plan's price, and how fast each building is selling out (sales and sellout).
- Subway walk times. The walk to the nearest entrance and the next station, on every building page.
- The whole ecosystem. Who developed, designed, built, financed and sold each building, and who they worked with before (developers, architects, construction lenders, general contractors).
- New filings first. Plans as the Attorney General accepts them, often before a building is marketed (new filings).
- Answers in ChatGPT or Claude, cited to the plan.
Who It's For
- Buyers and their attorneys: what the plan promises, what it will cost each month, what changed, and what neighbors paid.
- Agents: prices, budgets and closings for every new building, ready for a client in minutes.
- Developers, lenders and consultants: who has worked with whom across every plan, and how their buildings priced and sold.
Get Started Now
No demo, no sales call. Search any address, building or firm on The Condo Book Project, or see Pro pricing.
FAQ
How much does Marketproof cost?
Marketproof doesn't publish its platform pricing; you get it from its sales team. Its AI connector is sold separately in prepaid credits.
How much does The Condo Book Project cost?
Searching plans and building pages is free. Pro adds advanced research tools, recorded unit closings and full access from ChatGPT and Claude, at a price listed on our pricing page, and you can sign up online right away.
Does The Condo Book Project have sales data?
Yes: closings recorded with the city (ACRIS), matched to units and compared with the plan's price. See sales and sellout.
Are they related?
No. The Condo Book Project is independent and isn't affiliated with Marketproof or the Attorney General.
Where this comes from: Marketproof's public pages, as linked above, read in November 2026; The Condo Book Project's records. If something about Marketproof has changed, let us know. Updated November 2026.
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