684 Dean Street
684 Dean Street · Prospect Heights
Prospect Heights, Brooklyn
BBL 3011387503 · BIN 3430136
- Type
- Condominium
- Amenities
- Elevator; virtual entry; central air; in-unit laundry; private outdoor space in selected homes
- Landmark status
- Not an individual landmark; not in a historic district
- NYC Landmarks Preservation Commission and City Planning records, updated February 2026
Every recorded sale at this building, 1998–2026
Price-per-square-foot over time, the line- and floor-premium curves, and every recorded sale.
- Median $/sf, 2026 to date
- $1,509
- 2 sales
- Listing discount
- 0.2%
- Recorded sales
- 8
- On record
- 1998–2026
Own an apartment here? See what it would sell for.
A Private Pricing Opinion — what your apartment at 684 Dean Street would likely sell for today, what it costs to sell, and what you’d walk away with — reviewed personally against condition, exposures, renovation quality, and the competition actually on the market.
About the building
684 Dean Street is a six-floor condominium with five residences in Prospect Heights. New-building filings identify Tahir Demircioglu as the architect. Its compact apartment inventory occupies a taller envelope than the surrounding townhouse pattern, with an elevator and a virtual entry system. Initial individual apartment closings took place in late 2025.
The lower home is a three-bedroom garden duplex arranged across the first and second floors, with a patio reached from the living area. Middle apartments include two-bedroom, two-bath layouts; the upper penthouse has three bedrooms. Central air and in-unit laundry are included.
Monthly carrying charges in recent sales
- Common charges + taxes, per room
- $543 per room a monthMedian of 3 recorded sales since October 2023Source: recorded sales, refreshed October 2026
- Common charges + taxes, per square foot
- $1.51 per square foot a monthMedian of 3 recorded sales since October 2023Source: recorded sales, refreshed October 2026
Common charges plus real estate taxes, combined into one monthly figure the way New York condominium listings show them. Add a mortgage payment for the monthly outlay. A summary of recorded sales, not a current bill; charges change.
Local Law 97
This building is below the 25,000 sq ft threshold at which LL97 limits apply to a building on its own. It is still covered if it shares a tax lot or condominium board with buildings totaling over 50,000 sq ft; confirm on DOB’s covered-buildings list.
See full Local Law 97 analysis →Recent sales
Recent closings at this building, from The Roebling Research Library. Prices are the transfer amounts recorded with the NYC Department of Finance; apartment-level detail is checked against the building’s own file in The Roebling Research Library before publishing.
| Date | Unit | Apartment | Price | PPSF | vs. Ask |
|---|---|---|---|---|---|
| Oct 30, 2026 | 3Sponsor Sale | 2 BR · 2 BA · 1,127 sf | $1,725,000 | $1,531/sf | +0.0% |
| Oct 15, 2026 | 2Sponsor Sale | 2 BR · 2 BA · 1,127 sf | $1,675,000 | $1,486/sf | -2.9% |
| Dec 30, 2025 | TH1 | 3 BR · 2.5 BA · 1,796 sf | $2,990,000 | $1,665/sf | -0.2% |
| Dec 30, 2025 | 1 | 3 BR · 2.5 BA · 1,796 sf | $2,990,000 | $1,665/sf | -0.2% |
| Dec 2, 2025 | 4 | 2 BR · 2 BA · 1,127 sf | $1,800,000 | $1,597/sf | -1.4% |
| Jul 27, 2020 | — | 6 BR · 2.5 BA · 2,319 sf | $1,950,000 | $841/sf | -11.4% |
Market read. Most recent trades (2026 to date) cleared a median $1,509/sf (recorded) across 2 sales. Median listing discount 0.2% from the last ask — a recurring negotiation gap worth pricing into any offer or listing strategy.
Full closing history with price-per-square-foot over time, the complete retrade record, and every line that has traded.
Sales sourced from NYC Department of Finance recorded transfers (BBL 3-01138-7503; each condominium apartment is its own tax lot). Apartment-level facts (line, condition, asking-price context) curated and cross-verified in The Roebling Research Library. Not all transactions cross-verify with ACRIS records — sponsor and LLC purchases sometimes record at stipulated values rather than market price; square footage from recorded condo declarations and offering plans.
What would your apartment rent for?
Enter your apartment and I'll send you what it would rent for, from comparable closed leases at 684 Dean Street and nearby.
At the recent median sale of $1.8M (5 sales in the past 24 months, since November 12, 2024), a buyer putting 25% down would pay about $74,118 to close, or 4.1% of the price.
- Mansion tax: $18,000
- Mortgage recording tax: $25,988
- Title insurance: $8,100
- Attorneys, lender, building fees, reserves and filings: $22,030
Assumes a resale (the seller pays transfer taxes), a $4,500 attorney fee and a mortgage on the rest.
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What to know if you’re buying
A five-home association maintains a six-floor building. Elevator upkeep, façade repairs and roof expenses fall on a small ownership group. Project eligibility can receive closer scrutiny from a mortgage lender at this scale, so the building's financing approval matters alongside approval of the individual borrower.
Comparable buildings
- 357 Prospect Place: a nearby small condominium with a similarly limited apartment inventory.
- 532 Clinton Avenue: a taller condominium with a larger association near the Prospect Heights boundary.
- 280 Saint Marks Avenue: a substantially larger modern condominium for comparing new-construction layouts and shared amenities.
More Prospect Heights buildings
- 618 Dean Street (The Merchant House), 618 and 626 Dean Street — 1930 condominium
- 650 Bergen Street — 2013 condominium
- 660 Dean Street — 1931 condominium
- 700 Pacific Street (Newswalk) — 1927 condominium
- 747 Dean Street — 2023 condominium
- 751 Dean Street — 2014 condominium
The neighborhood
For the full neighborhood — its buildings, character, and market — read The Roebling Team Guide to Prospect Heights.
How to read the facts on this page. Items attributed to an offering plan describe the building as it was offered at that filing — unit mix, square footage, the amenity program as planned. They are not a statement about how the building operates today. Tax and compliance figures are sourced separately to current City records and carry their own dates. House rules, staffing and fee policy can change by board resolution without any public filing: treat every policy line here as a starting point for diligence and confirm it with the managing agent. Where this page compares one building or neighborhood to another, that is our analysis of the recorded record — it names the measure, the period and the sample it rests on, and it is an observation about medians rather than a prediction about any particular apartment.
Considering a move at 684 Dean Street?
Request a private building brief with the relevant comparable sales, current and off-market availability, and an apartment-specific view of value.
646.939.7375 · c.cohen@compass.com