---
title: "909 Union Street, New York City, NY 11215"
description: "909 Union Street, New York City, NY 11215 — Townhouse in Park Slope, Brooklyn, NY. Last Sold Price $4,700,000. Sold on 8/10/2026. 7 bed, 6 bath, 1,000 sqft"
url: "https://realestaterebatesnewyork.com/buy/newyorkcity/brooklyn/11215/909-union-street-ny-11215"
source: "Real Estate Rebate Team"
status: "Closed"
---

# 909 Union Street, New York City, NY 11215

Townhouse in Park Slope, Brooklyn, NY

Courtesy of Corcoran Group

## At a Glance

- **Last Sold Price**: $4,700,000
- **Status**: Sold on 8/10/2026
- **Beds**: 7
- **Total Baths**: 6
- **Sqft**: 1,000
- **Monthly Taxes**: $2,160 / mo
- **Price per Sqft**: $4,700
- **Brokerage Fee**: Share Eligible

This listing was successfully closed and is no longer active on the market.

[Planning to sell? Contact Régis Roumila](https://realestaterebatesnewyork.com/contact)

## Photos (10)

![909 Union Street, New York City, NY 11215 — photo 1 of 10](https://realestaterebatesnewyork-bucket.nyc3.cdn.digitaloceanspaces.com/bc8019c2-09fe-46b3-bda5-0335ee6a7d5f.jpg)
![909 Union Street, New York City, NY 11215 — photo 2 of 10](https://realestaterebatesnewyork-bucket.nyc3.cdn.digitaloceanspaces.com/276a0ae2-29e8-4d11-9b59-6e0e330d7b39.jpg)
![909 Union Street, New York City, NY 11215 — photo 3 of 10](https://realestaterebatesnewyork-bucket.nyc3.cdn.digitaloceanspaces.com/d40e2ee1-6700-4601-a40c-09ce4ac94f22.jpg)
![909 Union Street, New York City, NY 11215 — photo 4 of 10](https://realestaterebatesnewyork-bucket.nyc3.cdn.digitaloceanspaces.com/07aeede5-b831-472c-b975-3aeb114f6140.jpg)
![909 Union Street, New York City, NY 11215 — photo 5 of 10](https://realestaterebatesnewyork-bucket.nyc3.cdn.digitaloceanspaces.com/62d22c78-32c3-4084-a655-ed21eb64d7e3.jpg)
![909 Union Street, New York City, NY 11215 — photo 6 of 10](https://realestaterebatesnewyork-bucket.nyc3.cdn.digitaloceanspaces.com/37de28c1-80af-42c8-aa20-36dafc1a2b98.jpg)
![909 Union Street, New York City, NY 11215 — photo 7 of 10](https://realestaterebatesnewyork-bucket.nyc3.cdn.digitaloceanspaces.com/48402643-788e-4a06-9749-1c0580e49f6f.jpg)
![909 Union Street, New York City, NY 11215 — photo 8 of 10](https://realestaterebatesnewyork-bucket.nyc3.cdn.digitaloceanspaces.com/824af4be-cd80-4a60-955f-a033eb91409f.jpg)
![909 Union Street, New York City, NY 11215 — photo 9 of 10](https://realestaterebatesnewyork-bucket.nyc3.cdn.digitaloceanspaces.com/12a15b4f-c591-49ce-9778-3bf0e34e7c33.jpg)
![909 Union Street, New York City, NY 11215 — photo 10 of 10](https://realestaterebatesnewyork-bucket.nyc3.cdn.digitaloceanspaces.com/7b2aa230-3f76-45c4-96df-f57ed22469c4.jpg)

## Property Overview

An amazing opportunity in a perfect Park Slope location! 909 Union Street is a five-story brick-and-limestone townhouse, currently configured as an owner's lower duplex with three simplex apartments above. Spanning approximately 5,300 square feet, it offers true flexibility: hold as a high-performing four-unit rental, convert to condos, or enjoy the mint owner's duplex with substantial rental income upstairs.

 The owner's duplex has been thoughtfully renovated for effortless living. The parlor level delivers a nearly 60-foot great-room experience-an oversized living room and generous dining area, all designed to host beautifully. The chef's kitchen is a standout, featuring Bilotta cabinetry, Viking and Bosch appliances, and a River Granite center island with a prep sink, plus dual wall ovens (standard + convection) and a six-burner cooktop-a true cook's dream. The kitchen opens onto a spacious deck, which flows down to the back garden. A renovated powder room is also found on this level.

 Downstairs, the garden level features a large bedroom and media room (currently used as the second bedroom). The primary suite opens directly to the garden. The en-suite bath is spa-like, with radiant heated floors, a double vanity, and a jacuzzi tub. A second full bath offers a marble shower and elegant marble-accented flooring. Carrara marble floors throughout the level are among the most recent upgrades, and the large utility/laundry room provides generous storage.

 The three upper floors are configured as three charming two-bedroom residences, each with a washer/dryer and dishwasher, plus classic details like decorative moldings and fireplace mantels. The top-floor living room is crowned by a dramatic original stained-glass window-an unforgettable finishing touch.

 Situated in the heart of Park Slope, within the original Park Slope Historic District, this home is moments from Grand Army Plaza, Prospect Park, the Brooklyn Museum, the Brooklyn Botanic Garden, Union Market, and access to the B/Q and 2/3 subway lines.

## Property Details

- **Property Type**: Multi Family
- **Beds**: 7
- **Total Baths**: 6
- **Rooms**: 16
- **Sqft**: 1,000 sqft
- **Stories**: 4
- **Year Built**: 1920
- **Price per Sqft**: $4,700
- **Monthly Taxes**: $2,160 / mo
- **Listed On**: Mar 12, 2026
- **Days on Market**: 184 Days

### Residence Features

- Central Air
- Washer Hookup
- In Unit
- See Remarks
- Private Outdoor Space Over 60 Sqft
- High Ceilings
- Smoke Free

## Sales Evidence

### Recent closed sales

909 UNION Street has one recorded sale since September 2021, the most recent for $4,700,000 in August 2026. Prices are the figures recorded with the City, not asking prices.

| Unit | Beds | Sq Ft | Sold Price | $/ft² | Sold | Source |
| --- | --- | --- | --- | --- | --- | --- |
| Entire property (Multi Family) | 7 | 1,000 | $4,700,000 | $4,700/ft² | August 10, 2026 | MLS |

### 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 $4,700,000, $1,300,000 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 909 UNION Street](https://realestaterebatesnewyork.com/buildings/new-york-city/brooklyn/909-union-street)

## Price and Property History for 909 Union Street

Review the recorded listing activity for 909 Union Street, including asking-price changes and prior market dates.

- **Latest price change**: Reduced by $195,000, or 4%, on August 10, 2026
- **Originally listed**: March 13, 2026 at $4,995,000
- **Last sold**: $4,700,000 on August 10, 2026

| Date | Price | Listing event |
| --- | --- | --- |
| August 10, 2026 | $4,700,000 | Sold |
| August 10, 2026 | $4,700,000 | Asking price reduced by $195,000, or 4% |
| July 8, 2026 | $4,895,000 | Entered contract |
| April 14, 2026 | $4,895,000 | Asking price reduced by $100,000, or 2% |
| March 13, 2026 | $4,995,000 | Listed for sale by Corcoran Group |

## Property Tax History

Taxes at 909 Union Street were $25,926 in 2026.

| Year | Tax Assessment | Land | Additions | Billable Value | Property Tax | Tax Rate |
| --- | --- | --- | --- | --- | --- | --- |
| 2026 (FY 2026/27) | $897,300 | $14,850 | $882,450 | $207,409 | $25,926 | 12.5% (estimated) |
| 2025 (FY 2025/26) | $949,500 | $14,850 | $934,650 | $207,409 | $25,926 | 12.5% (estimated) |
| 2024 (FY 2024/25) | $1,186,650 | $14,850 | $1,171,800 | $200,975 | $25,122 | 12.5% |
| 2023 (FY 2023/24) | $1,198,350 | $14,850 | $1,183,500 | $186,089 | $23,265 | 12.502% |
| 2022 (FY 2022/23) | $998,550 | $14,850 | $983,700 | $172,307 | $21,137 | 12.267% |
| 2021 (FY 2021/22) | $1,174,500 | $14,850 | $1,159,650 | $159,545 | $19,520 | 12.235% |
| 2020 (FY 2020/21) | $1,269,450 | $14,850 | $1,254,600 | $159,545 | $19,571 | 12.267% |
| 2019 (FY 2019/20) | $1,273,950 | $14,850 | $1,259,100 | $154,596 | $19,283 | 12.473% |
| 2018 (FY 2018/19) | $143,145 | — | — | $143,145 | $18,053 | 12.612% |
| 2017 (FY 2017/18) | $132,544 | — | — | $132,544 | $16,858 | 12.719% |
| 2016 (FY 2016/17) | $122,727 | — | — | $122,727 | $15,822 | 12.892% |
| 2015 (FY 2015/16) | $122,727 | — | — | $122,727 | $15,811 | 12.883% |
| 2014 (FY 2014/15) | $118,920 | — | — | $118,920 | $15,287 | 12.855% |
| 2013 (FY 2013/14) | $110,112 | — | — | $110,112 | $14,474 | 13.145% |
| 2012 (FY 2012/13) | $101,957 | — | — | $101,957 | $13,439 | 13.181% |
| 2011 (FY 2011/12) | $94,406 | — | — | $94,406 | $12,682 | 13.433% |
| 2010 (FY 2010/11) | $94,406 | — | — | $94,406 | $12,606 | 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 3010630049. 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

### 909 UNION Street

Park Slope · Multi Family

909 UNION Street, Brooklyn, NY 11215

A building in Park Slope, 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/909-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/11215/909-union-street-ny-11215) | 7 | 6 | 1,000 sqft | $4,700 | $4,700,000 (-4.0%) | Corcoran Group | Mar 12, 2026 | 184 days |

## Estimated Monthly Payment

**$25,926 / month**, assuming a 20% down payment ($940,000), a 6.5% interest rate and a 30-year term. The page's calculator lets a buyer change all three.

- **Principal & Interest**: $23,766
- **Property Taxes**: $2,160

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

- [909 UNION Street — building page](https://realestaterebatesnewyork.com/buildings/new-york-city/brooklyn/909-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.