--- title: "879 UNION Street, New York City, NY 11215" description: "879 UNION Street, New York City, NY 11215 — Multi Family Brownstone in Park Slope, Brooklyn, NY. Listing Price $4,250,000. 7 bed, 6 bath, 1,008 sqft Illustrative Buyer Commission Share of $63,750 at closing, based on a 3% buyer-broker commission." url: "https://realestaterebatesnewyork.com/buy/newyorkcity/brooklyn/11215/879-union-street-ny-11215" source: "Real Estate Rebate Team" status: "Active" --- # 879 UNION Street, New York City, NY 11215 Multi Family Brownstone in Park Slope, Brooklyn, NY Courtesy of Douglas Elliman Real Estate ## At a Glance - **Listing Price**: $4,250,000 - **Beds**: 7 - **Baths**: 6 - **Sqft**: 1,008 - **Monthly Taxes**: $2,112 / mo - **Price per Sqft**: $4,216 - **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**: $4,250,000 - **Illustrative Buyer Commission Share**: -$63,750* - **Illustrative Net Cost**: $4,186,250 *Illustrative Buyer Savings of $63,750 — 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) ![879 UNION Street, New York City, NY 11215 — photo 1 of 10](https://realestaterebatesnewyork-bucket.nyc3.cdn.digitaloceanspaces.com/9e90037e-dddf-4d44-86b1-aa6d70d21b60.jpg) ![879 UNION Street, New York City, NY 11215 — photo 2 of 10](https://realestaterebatesnewyork-bucket.nyc3.cdn.digitaloceanspaces.com/603c881e-cd1f-4013-9345-ede0a4db166c.jpg) ![879 UNION Street, New York City, NY 11215 — photo 3 of 10](https://realestaterebatesnewyork-bucket.nyc3.cdn.digitaloceanspaces.com/85454010-2a98-4e72-9533-d6d02ab0c32c.jpg) ![879 UNION Street, New York City, NY 11215 — photo 4 of 10](https://realestaterebatesnewyork-bucket.nyc3.cdn.digitaloceanspaces.com/a79ec27e-0d05-4111-aacb-0393e34bff5d.jpg) ![879 UNION Street, New York City, NY 11215 — photo 5 of 10](https://realestaterebatesnewyork-bucket.nyc3.cdn.digitaloceanspaces.com/5aa57efc-38ed-4fa5-b873-2cb74b430a09.jpg) ![879 UNION Street, New York City, NY 11215 — photo 6 of 10](https://realestaterebatesnewyork-bucket.nyc3.cdn.digitaloceanspaces.com/3a526ded-f504-40e3-8069-93423bcb8788.jpg) ![879 UNION Street, New York City, NY 11215 — photo 7 of 10](https://realestaterebatesnewyork-bucket.nyc3.cdn.digitaloceanspaces.com/59d5caf0-c20f-4e15-9387-7c303a8d8253.jpg) ![879 UNION Street, New York City, NY 11215 — photo 8 of 10](https://realestaterebatesnewyork-bucket.nyc3.cdn.digitaloceanspaces.com/89c8744a-b9c2-4ef1-8cad-44de8c0af1cc.jpg) ![879 UNION Street, New York City, NY 11215 — photo 9 of 10](https://realestaterebatesnewyork-bucket.nyc3.cdn.digitaloceanspaces.com/3f0709c2-3f38-4f27-a2d7-a56ee318e7c1.jpg) ![879 UNION Street, New York City, NY 11215 — photo 10 of 10](https://realestaterebatesnewyork-bucket.nyc3.cdn.digitaloceanspaces.com/389b292e-67d7-4aaf-aaab-0367863b5932.jpg) ## Property Overview Nestled on one of Park Slope's most picturesque, treelined blocks, 879 Union Street presents a rare opportunity to own a grand 21 foot wide brownstone that seamlessly blends historic charm with exceptional flexibility and income potential. Built in 1885 and spanning approximately 4,030 square feet, this stately residence is configured as a 5 unit property, offering both an expansive owner's home and strong rental performance in one of Brooklyn's most desirable neighborhoods. For the end user, the garden duplex delivers a true brownstone lifestyle - thoughtfully scaled with 3 bedrooms, 2 baths, and a private deck that opens to a generous landscaped garden. Rich prewar details - including original woodwork, tall windows, hardwood floors, and soaring ceilings - create a warm, inviting atmosphere that is both timeless and livable. The home is further enhanced by private access to the cellar, adding valuable bonus space for storage, recreation, or customization to suit your needs. For the developer or investor, the property offers substantial upside. Configured with 4 free market rental units above the owner's duplex, the building provides immediate income with long term growth potential. Its rare 21' x 48' footprint allows for a range of strategic possibilities - whether optimizing the current rental mix, upgrading finishes, or reimagining the layout to maximize value. In addition, the property benefits from ample unused air rights, presenting a compelling opportunity for expansion and further value creation. The combination of scale, width, and development potential is increasingly difficult to find, making this a uniquely adaptable asset in a supply constrained Park Slope market. Positioned between 7th and 8th Avenues, just moments from Prospect Park, Grand Army Plaza, and some of Brooklyn's best dining, shopping, and transportation, 879 Union Street offers the perfect balance of tranquility and connectivity. Whether envisioned as a luxurious primary residence with rental income, a multigenerational home, or a high-performing investment property, this is a rare chance to acquire a premier Park Slope brownstone with both immediate appeal and lasting upside. You should live here! ## Property Details - **Property Type**: Multi Family - **Beds**: 7 - **Baths**: 6 - **Rooms**: 19 - **Sqft**: 1,008 sqft - **Stories**: 4 - **Year Built**: 1920 - **Price per Sqft**: $4,216 - **Monthly Taxes**: $2,112 / mo - **Listed On**: Jun 2, 2026 - **Days on Market**: 103 Days ### Residence Features - In Unit - Smoke Free ## Sales Evidence ### How this price compares The median closed price for comparable house sales in Park Slope is $3,400,000, based on 56 sales between October 2021 and August 2026. This home is asking $4,250,000, $850,000 above that median. The middle half of those sales closed between $2,576,250 and $3,942,500. - **Median closed price**: $3,400,000 - **Middle half**: $2,576,250 – $3,942,500 - **Based on**: 56 house sales in Park Slope - **Period**: October 2021 – August 2026 - **Median $/ft²**: $1,100/ft² Across the 42 of these sales with a published asking price, the median closed at 95.9% of what it originally asked. 60% of them closed below the original ask. A house is not part of a building of comparable apartments, so this benchmark is drawn from house sales across Park Slope. Apartment sales are excluded from it entirely. ### How these sales were negotiated - **Sold vs original ask**: 95.9% of the original ask - **Closed below ask**: 60% of 42 sales - **Listed → in contract**: 47 days (about 7 weeks) - **In contract → closed**: 73 days (about 10 weeks) Across the 42 of these sales with a published asking price, the median closed at 95.9% of what it originally asked. 60% of them closed below the original ask. Half of these homes were in contract within 47 days (about 7 weeks) of coming to market, based on the 55 with a recorded listing date. Once a deal was agreed, closing took a further 73 days (about 10 weeks), based on the 54 with both dates recorded. These are two separate periods measured on different clocks — time to find a buyer, and time from agreed deal to closing. They are medians of different sets of sales and do not add together into a single "days on market" figure. Based on 56 house sales in Park Slope, October 2021 – August 2026. 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 879 UNION Street](https://realestaterebatesnewyork.com/buildings/new-york-city/brooklyn/879-union-street) ## Property Tax History Taxes at 879 UNION Street were $28,661 in 2026. | Year | Tax Assessment | Land | Additions | Billable Value | Property Tax | Tax Rate | | --- | --- | --- | --- | --- | --- | --- | | 2026 (FY 2026/27) | $1,293,750 | $205,200 | $1,088,550 | $229,291 | $28,661 | 12.5% (estimated) | | 2025 (FY 2025/26) | $1,105,650 | $205,200 | $900,450 | $229,215 | $28,652 | 12.5% (estimated) | | 2024 (FY 2024/25) | $1,062,450 | $205,200 | $857,250 | $212,271 | $26,534 | 12.5% | | 2023 (FY 2023/24) | $1,029,150 | $205,200 | $823,950 | $196,587 | $24,577 | 12.502% | | 2022 (FY 2022/23) | $857,700 | $205,200 | $652,500 | $190,437 | $23,361 | 12.267% | | 2021 (FY 2021/22) | $946,800 | $205,200 | $741,600 | $176,378 | $21,580 | 12.235% | | 2020 (FY 2020/21) | $919,350 | $205,200 | $714,150 | $176,319 | $21,629 | 12.267% | | 2019 (FY 2019/20) | $766,260 | $205,200 | $561,060 | $163,285 | $20,367 | 12.473% | | 2018 (FY 2018/19) | $151,221 | — | — | $151,221 | $19,072 | 12.612% | | 2017 (FY 2017/18) | $146,490 | — | — | $146,490 | $18,632 | 12.719% | | 2016 (FY 2016/17) | $135,675 | — | — | $135,675 | $17,491 | 12.892% | | 2015 (FY 2015/16) | $135,630 | — | — | $135,630 | $17,473 | 12.883% | | 2014 (FY 2014/15) | $125,604 | — | — | $125,604 | $16,146 | 12.855% | | 2013 (FY 2013/14) | $116,324 | — | — | $116,324 | $15,291 | 13.145% | | 2012 (FY 2012/13) | $112,685 | — | — | $112,685 | $14,853 | 13.181% | | 2011 (FY 2011/12) | $104,366 | — | — | $104,366 | $14,019 | 13.433% | | 2010 (FY 2010/11) | $104,331 | — | — | $104,331 | $13,931 | 13.353% | The City has not published the official FY2026/27 and FY2025/26 tax rates yet. We calculated the tax for those years using the prior year’s rate, so treat them as an estimate rather than a figure the City has adopted. Every rate without the Estimated marker is the published one. Tax Assessment is the assessed value on the City’s roll, and it is the figure other listing sites publish. It is not what the bill is calculated on. New York phases assessment changes in gradually for some tax classes, so the City bills the Billable Value shown beside it, less any exemption the owner holds. It usually trails the assessment, and it can sit above it for a few years after an assessment falls. Figures are the New York City Department of Finance assessment roll for tax lot 3010630064. Assessed and billable values are determined by the City for tax purposes and are not an appraisal or an estimate of market value. Tax classes and rates are set annually and can change. [How we source and calculate NYC property tax data](https://realestaterebatesnewyork.com/nyc-property-tax-data-methodology) ## About The Building ### 879 UNION Street 879 UNION Street, Brooklyn, NY 11215 A building in the neighborhood, currently featuring 1 active listing. - **Year Built**: 1920 - **Total Units**: 1 - **Floors**: 4 [View the building page](https://realestaterebatesnewyork.com/buildings/new-york-city/brooklyn/879-union-street) ### Available Residences — For Sale (1) | Unit | Beds | Baths | Size | Price / Ft² | Price | Listing Office | Listed Date | Days on Market | | --- | --- | --- | --- | --- | --- | --- | --- | --- | | [N/A](https://realestaterebatesnewyork.com/buy/newyorkcity/brooklyn/11215/879-union-street-ny-11215) | 7 | 6 | 1,008 sqft | $4,216 | $4,250,000 | Douglas Elliman Real Estate | Jun 2, 2026 | 102 days | ## Estimated Monthly Payment **$23,602 / month**, assuming a 20% down payment ($850,000), a 6.5% interest rate and a 30-year term. The page's calculator lets a buyer change all three. - **Principal & Interest**: $21,490 - **Property Taxes**: $2,112 Estimates only. Actual payments may vary. Confirm terms with your lender. ## Park Slope Overview of Park Slope [Explore Park Slope](https://realestaterebatesnewyork.com/neighborhoods/new-york-city/brooklyn/park-slope) · [All Neighborhoods](https://realestaterebatesnewyork.com/neighborhoods) ### Nearby Park Slope - [Prospect Heights real estate for sale](https://realestaterebatesnewyork.com/neighborhoods/new-york-city/brooklyn/prospect-heights) - [Gowanus real estate for sale](https://realestaterebatesnewyork.com/neighborhoods/new-york-city/brooklyn/gowanus) - [South Slope real estate for sale](https://realestaterebatesnewyork.com/neighborhoods/new-york-city/brooklyn/south-slope) - [Prospect Park real estate for sale](https://realestaterebatesnewyork.com/neighborhoods/new-york-city/brooklyn/prospect-park) - [Boerum Hill real estate for sale](https://realestaterebatesnewyork.com/neighborhoods/new-york-city/brooklyn/boerum-hill) - [Carroll Gardens real estate for sale](https://realestaterebatesnewyork.com/neighborhoods/new-york-city/brooklyn/carroll-gardens) ## Related Links - [879 UNION Street — building page](https://realestaterebatesnewyork.com/buildings/new-york-city/brooklyn/879-union-street) - [Park Slope neighborhood guide](https://realestaterebatesnewyork.com/neighborhoods/new-york-city/brooklyn/park-slope) - [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.