--- title: "423 Atlantic Avenue #3J, New York City, NY 11217" description: "423 Atlantic Avenue #3J, New York City, NY 11217 — Boerum Hill, New York City, NY. Listing Price $1,280,000. 1 bed, 1 bath, 1,000 sqft Illustrative Buyer Commission Share of $19,200 at closing, based on a 3% buyer-broker commission." url: "https://realestaterebatesnewyork.com/buy/newyorkcity/brooklyn/11217/423-atlantic-avenue-3j-ny-11217" source: "Real Estate Rebate Team" dateModified: "2026-09-05T18:39:31.740Z" status: "Active" --- # 423 Atlantic Avenue #3J, New York City, NY 11217 Boerum Hill, New York City, NY Courtesy of Compass Last updated: September 5, 2026, 2:39 PM ## At a Glance - **Listing Price**: $1,280,000 - **Beds**: 1 - **Baths**: 1 - **Sqft**: 1,000 - **Common Charges**: $1,918 / mo - **Price per Sqft**: $1,280 - **Brokerage Fee**: Share Eligible ## The Private Brokerage Advantage As an independent luxury buyer representative, Régis shares 50% of the buyer-side commission he actually receives on your purchase. Eligible buyers receive that Buyer Commission Share directly at closing to offset closing costs, down payments, or renovations. The figures below are illustrative, based on a **3% buyer-broker commission**; your share follows the commission offered on the transaction. - **Contract Purchase Price**: $1,280,000 - **Illustrative Buyer Commission Share**: -$19,200* - **Illustrative Net Cost**: $1,260,800 *Illustrative Buyer Savings of $19,200 — 50% of a 3% buyer-broker commission, shared at closing.* [Request a private tour](https://realestaterebatesnewyork.com/contact) · [Estimate your Buyer Commission Share](https://realestaterebatesnewyork.com/calculators/buyer-closing-cost-calculator) ## Photos (10) ![423 Atlantic Avenue #3J, New York City, NY 11217 — photo 1 of 10](https://realestaterebatesnewyork-bucket.nyc3.cdn.digitaloceanspaces.com/2fbf3d77-9ec6-4ed6-89ac-1b18639643fd.jpg) ![423 Atlantic Avenue #3J, New York City, NY 11217 — photo 2 of 10](https://realestaterebatesnewyork-bucket.nyc3.cdn.digitaloceanspaces.com/c2c6512f-69d6-4cb0-912c-931ee7f0be37.jpg) ![423 Atlantic Avenue #3J, New York City, NY 11217 — photo 3 of 10](https://realestaterebatesnewyork-bucket.nyc3.cdn.digitaloceanspaces.com/7357cec2-043c-468d-8045-89acbd4994a7.jpg) ![423 Atlantic Avenue #3J, New York City, NY 11217 — photo 4 of 10](https://realestaterebatesnewyork-bucket.nyc3.cdn.digitaloceanspaces.com/e47b0e46-df83-42a7-9de5-dd462f27d6a4.jpg) ![423 Atlantic Avenue #3J, New York City, NY 11217 — photo 5 of 10](https://realestaterebatesnewyork-bucket.nyc3.cdn.digitaloceanspaces.com/224ceab5-0954-4ebb-9b3f-843748f364fa.jpg) ![423 Atlantic Avenue #3J, New York City, NY 11217 — photo 6 of 10](https://realestaterebatesnewyork-bucket.nyc3.cdn.digitaloceanspaces.com/06f9eee4-3f5b-4e0b-bf91-b2633ac79aaa.jpg) ![423 Atlantic Avenue #3J, New York City, NY 11217 — photo 7 of 10](https://realestaterebatesnewyork-bucket.nyc3.cdn.digitaloceanspaces.com/cef2b1e5-46c1-46c8-b801-8bb21e1de1e1.jpg) ![423 Atlantic Avenue #3J, New York City, NY 11217 — photo 8 of 10](https://realestaterebatesnewyork-bucket.nyc3.cdn.digitaloceanspaces.com/5e827a50-c148-4fc8-8aa5-a7707b357391.jpg) ![423 Atlantic Avenue #3J, New York City, NY 11217 — photo 9 of 10](https://realestaterebatesnewyork-bucket.nyc3.cdn.digitaloceanspaces.com/3ba6edfc-60ed-4ea2-b34f-ff5dddd6f180.jpg) ![423 Atlantic Avenue #3J, New York City, NY 11217 — photo 10 of 10](https://realestaterebatesnewyork-bucket.nyc3.cdn.digitaloceanspaces.com/5885db08-8c9c-4fd8-aa1a-fbd41a386f35.jpg) ## Property Overview Welcome to your new home at 423 Atlantic Ave, Brooklyn, NY, a stunning co-op residence that perfectly blends classic architectural charm with modern conveniences. This spacious 1000 square foot midrise apartment offers a serene retreat in the heart of the city. As you enter, you'll be captivated by the high ceilings ( 12 FEET) and elegant columns that add a touch of sophistication to the space. The southern exposure floods the apartment with natural light, highlighting the beautiful hardwood floors throughout. The oversized, soundproof windows ensure a peaceful living environment, allowing you to enjoy the vibrant city views without the noise. Currently, it is configured as a large open loft but it can easily be converted to a 1 bedroom plus a den/office. ( see alternate floorplan) The well-appointed eat-in kitchen is a chef's delight, featuring a gas oven, dishwasher, and ample space for dining. The renovated bathroom offers a modern touch with stylish fixtures and finishes. The bedroom boasts a custom closet, providing ample storage for your wardrobe. Residents of this building enjoy a range of amenities, including a common roof deck perfect for relaxing or entertaining. The convenience of an elevator, in-unit washer/dryer, and additional laundry facilities in the building add to the ease of living. For those with vehicles, assigned parking and garage options are available. Security is a priority with a video intercom system, ensuring peace of mind. This co-op is a rare find, offering a harmonious blend of comfort, style, and convenience in one of Brooklyn's most sought-after neighborhoods. Don't miss the opportunity to make this exceptional property your new home. ## Property Details - **Property Type**: Co-op - **Beds**: 1 - **Baths**: 1 - **Rooms**: 3 - **Sqft**: 1,000 sqft - **Stories**: 6 - **Year Built**: 1900 - **Price per Sqft**: $1,280 - **Common Charges**: $1,918.07 / Monthly - **Listed On**: Aug 24, 2026 - **Days on Market**: 13 Days ### Residence Features - Building Washer Dryer Install Allowed - Common On Floor - Common Area - Assigned - Garage - Building Roof Deck - Eat-in Kitchen - High Ceilings - Dryer - Dishwasher - Gas Oven - Washer - Hardwood ### Building Amenities - Assigned - Garage ## Sales Evidence ### Recent closed sales 14 apartments at ExLax Building have recorded sales since September 2021, the most recent for $1,510,000 in September 2025. Prices are the figures recorded with the City, not asking prices. | Unit | Beds | Sq Ft | Sold Price | $/ft² | Sold | Source | | --- | --- | --- | --- | --- | --- | --- | | 3C (Apartment) | 2 | — | $1,510,000 | — | September 16, 2025 | City record · MLS | | 3NP (Apartment) | 2 | 1,854 | $2,750,000 | $1,483/ft² | June 25, 2025 | City record · MLS | | 4N (Apartment) | 1 | — | $1,085,000 | — | June 24, 2025 | City record · MLS | | 4C (Apartment) | — | — | $1,355,000 | — | May 23, 2023 | City record | | 4-M (Apartment) | 2 | — | $1,835,000 | — | January 10, 2023 | City record · MLS | | 4-A (Apartment) | 2 | — | $1,700,000 | — | July 20, 2022 | City record · MLS | | 5-D (Apartment) | 2 | 1,277 | $1,600,000 | $1,253/ft² | June 6, 2022 | City record · MLS | | 3K (Apartment) | 1 | 900 | $825,000 | $917/ft² | May 16, 2022 | City record · MLS | | 2E (Apartment) | 2 | 1,300 | $1,325,000 | $1,019/ft² | April 27, 2022 | City record | | 4-E (Apartment) | 2 | 1,365 | $1,345,000 | $985/ft² | February 15, 2022 | City record · MLS | | 3C (Apartment) | 2 | — | $1,280,000 | — | February 3, 2022 | City record · MLS | | 3H (Apartment) | — | — | $860,000 | — | December 10, 2021 | City record | | 1L (Apartment) | 2 | 1,800 | $1,875,000 | $1,042/ft² | November 17, 2021 | City record · MLS | | 2N (Apartment) | 1 | — | $999,999 | — | October 27, 2021 | City record · MLS | Every row is a recorded transaction, including ancillary spaces such as storage and staff rooms where they were sold separately. Those are excluded from the benchmark below. ### How this price compares The median closed price for comparable one-bedroom sales at ExLax Building is $999,999, based on 3 sales between October 2021 and June 2025. This home is asking $1,280,000, $280,001 above that median. The middle half of those sales closed between $912,500 and $1,042,500. - **Median closed price**: $999,999 - **Middle half**: $912,500 – $1,042,500 - **Based on**: 3 one-bedroom sales at ExLax Building - **Period**: October 2021 – June 2025 Square footage is recorded for only 1 of these 3 sales (33%), so no price per square foot is shown for this group. Co-op sales rarely carry a floor area, and a figure drawn from a handful of them would not describe the rest. Across the 3 of these sales with a published asking price, the median closed at 100.5% of what it originally asked. 33% of them closed below the original ask. ### How these sales were negotiated - **Sold vs original ask**: 100.5% of the original ask - **Closed below ask**: 33% of 3 sales Across the 3 of these sales with a published asking price, the median closed at 100.5% of what it originally asked. 33% of them closed below the original ask. Based on 3 one-bedroom sales at ExLax Building, October 2021 – June 2025. Each figure counts only the sales that recorded the dates it needs, which is why the denominators differ. Sale prices are the consideration recorded with the City in ACRIS, and each sale is dated by the day the City recorded it. A closing date reported to the MLS typically falls one to two weeks earlier. Recorded sales describe what has already happened and are not an appraisal, a valuation, or an estimate of what this home will sell for. [See every recorded sale at ExLax Building](https://realestaterebatesnewyork.com/buildings/new-york-city/brooklyn/exlax-building) ## Price and Property History for 423 Atlantic Avenue, Unit 3J Review the recorded listing activity for 423 Atlantic Avenue, Unit 3J, including asking-price changes and prior market dates. - **Last sold (recorded)**: $925,000 on August 9, 2021 | Date | Price | Listing event | | --- | --- | --- | | August 9, 2021 | $925,000 | Sold — recorded sale price | | April 13, 2021 | $850,000 | Entered contract | | March 15, 2021 | $850,000 | Listed for sale by The Corcoran Group | ## Property Taxes This apartment is part of a co-op that is taxed as one lot shared across 59 apartments. The corporation’s 2026 property tax bill was $1,221,149 for the whole building. Shareholders cover it through their monthly maintenance rather than a separate bill for this unit. [See the full property tax history for ExLax Building](https://realestaterebatesnewyork.com/buildings/new-york-city/brooklyn/exlax-building) [How we source and calculate NYC property tax data](https://realestaterebatesnewyork.com/nyc-property-tax-data-methodology) ## About The Building ### ExLax Building 423 Atlantic Avenue, Brooklyn, NY 11217 A building in the neighborhood, currently featuring 2 active listings. - **Year Built**: 1900 - **Total Units**: 2 - **Floors**: 6 [View the building page](https://realestaterebatesnewyork.com/buildings/new-york-city/brooklyn/exlax-building) ### Available Residences — For Sale (2) | Unit | Beds | Baths | Size | Price / Ft² | Price | Listing Office | Listed Date | Days on Market | | --- | --- | --- | --- | --- | --- | --- | --- | --- | | [3J](https://realestaterebatesnewyork.com/buy/newyorkcity/brooklyn/11217/423-atlantic-avenue-3j-ny-11217) | 1 | 1 | 1,000 sqft | $1,280 | $1,280,000 | Compass | Aug 24, 2026 | 13 days | | [3H](https://realestaterebatesnewyork.com/buy/newyorkcity/brooklyn/11217/423-atlantic-avenue-h-3H-ny-11217) | Studio | 1 | — | — | $925,000 — In contract | Corcoran Group | Jun 11, 2026 | 87 days | ## Estimated Monthly Payment **$8,390 / month**, assuming a 20% down payment ($256,000), a 6.5% interest rate and a 30-year term. The page's calculator lets a buyer change all three. - **Principal & Interest**: $6,472 - **Common Charges**: $1,918 Estimates only. Actual payments may vary. Confirm terms with your lender. ## Boerum Hill Overview of Boerum Hill [Explore Boerum Hill](https://realestaterebatesnewyork.com/neighborhoods/new-york-city/brooklyn/boerum-hill) · [All Neighborhoods](https://realestaterebatesnewyork.com/neighborhoods) ### Nearby Boerum Hill - [Cobble Hill real estate for sale](https://realestaterebatesnewyork.com/neighborhoods/new-york-city/brooklyn/cobble-hill) - [Downtown Brooklyn real estate for sale](https://realestaterebatesnewyork.com/neighborhoods/new-york-city/brooklyn/downtown-brooklyn) - [Fort Greene real estate for sale](https://realestaterebatesnewyork.com/neighborhoods/new-york-city/brooklyn/fort-greene) - [Carroll Gardens real estate for sale](https://realestaterebatesnewyork.com/neighborhoods/new-york-city/brooklyn/carroll-gardens) - [Gowanus real estate for sale](https://realestaterebatesnewyork.com/neighborhoods/new-york-city/brooklyn/gowanus) - [Brooklyn Heights real estate for sale](https://realestaterebatesnewyork.com/neighborhoods/new-york-city/brooklyn/brooklyn-heights) ## Related Links - [ExLax Building — building page](https://realestaterebatesnewyork.com/buildings/new-york-city/brooklyn/exlax-building) - [Boerum Hill neighborhood guide](https://realestaterebatesnewyork.com/neighborhoods/new-york-city/brooklyn/boerum-hill) - [Estimate your Buyer Commission Share and closing costs](https://realestaterebatesnewyork.com/calculators/buyer-closing-cost-calculator) - [Contact Régis Roumila](https://realestaterebatesnewyork.com/contact) --- > RLS IDX Data display by Real Estate Rebate Team. This information is not verified for authenticity or accuracy and is not guaranteed and may not reflect all real estate activity in the market. ©2026 The Real Estate Board of New York, Inc., All rights reserved. IDX information is provided exclusively for consumers’ personal, non-commercial use and it may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing. > All information furnished regarding property for sale, rental or financing is from sources deemed reliable, but no warranty or representation is made as to the accuracy thereof and same is submitted subject to errors, omissions, change of price, rental or other conditions, prior sale, lease or financing or withdrawal without notice. All dimensions are approximate. For exact dimensions, you must hire your own architect or engineer and the number of bedrooms listed is for informational purposes and is not a legal conclusion. Please consult with your own architect or engineer for exact dimensions and legal specifications.