12399 Flatlands Avenue #9E, New York City, NY 11208
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Regis Roumila
Verified Member: REBNY · NAR
NYDOS LIC#: 10491211335
Property Overview
Property Details
Residence Features
Building Amenities
Sales Evidence
Recent closed sales
9 apartments at 12399 FLATLANDS Avenue have recorded sales since September 2021, the most recent for $375,000 in April 2026. Prices are the figures recorded with the City, not asking prices.
| 7CApartment | Bedroom count not recorded | 898 | $375,000 | $418/ft² | April 7, 2026City record |
|---|---|---|---|---|---|
| 13 6LApartment | 2 | 808 | $369,000 | $457/ft² | August 12, 2025City record · MLS |
| 8FApartment | Bedroom count not recorded | 622 | $325,000 | $523/ft² | July 31, 2025City record |
| 4FApartment | Bedroom count not recorded | 622 | $100,000 | $161/ft² | April 9, 2025City record |
| 13 3JApartment | Bedroom count not recorded | 896 | $404,700 | $452/ft² | September 17, 2024City record |
| 13 5BApartment | Bedroom count not recorded | 643 | $302,000 | $470/ft² | October 6, 2022City record |
| 2EApartment | 2 | 885 | $370,000 | $418/ft² | August 2, 2022City record · MLS |
| 13-4BApartment | Bedroom count not recorded | 643 | $303,000 | $471/ft² | July 7, 2022City record |
| 13 3G/13 3JApartment | Bedroom count not recorded | 1,534 | $5,836,286 | $3,805/ft² | December 29, 2021City record |
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.
Price trend
Median price per square foot for sales at 12399 FLATLANDS Avenue, 2019 to 2025. Price per square foot is used rather than sale price so the line follows the market rather than whichever apartments happened to change hands that year.
| Year | Median $/ft² | Sales |
|---|---|---|
| 2019 | $340/ft² | 3Thin |
| 2021 | $408/ft² | 4Thin |
| 2022 | $470/ft² | 3Thin |
| 2025 | $457/ft² | 3Thin |
Years marked "thin" rest on fewer than 5 sales, where a single unusual apartment moves the median a long way. Read those points as the small samples they are rather than as the market turning.
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.
Property Tax History
Taxes at 12399 Flatlands Avenue #9E were $4,746 in 2026, up 8.3% from 2025.
| Year | Tax Assessment | Land | Additions | Billable Value | Property Tax | Tax Rate |
|---|---|---|---|---|---|---|
| 2026FY 2026/27 | $44,314 | $12,348 | $31,966 | $40,261 | $4,746 | 12.5%Estimated |
| 2025FY 2025/26 | $42,169 | $12,348 | $29,821 | $37,194 | $4,381 | 12.5%Estimated |
| 2024FY 2024/25 | $40,616 | $12,348 | $28,268 | $35,713 | $4,174 | 12.5% |
| 2023FY 2023/24 | $38,836 | $12,348 | $26,488 | $34,286 | $1,782after $2,214 abatement | 12.502% |
| 2022FY 2022/23 | $35,374 | $12,348 | $23,026 | $32,984 | $0after $4,854 abatement | 12.267% |
| 2021FY 2021/22 | $28,982 | $12,348 | $16,634 | $28,982 | $0after $4,486 abatement | 12.235% |
| 2020FY 2020/21 | $34,764 | $12,348 | $22,416 | $30,354 | $3,430 | 12.267% |
| 2019FY 2019/20 | $33,488 | $12,348 | $21,140 | $26,653 | $3,034 | 12.473% |
| 2018FY 2018/19 | $32,318 | $12,347 | $19,971 | $23,152 | $2,611 | 12.612% |
| 2017FY 2017/18 | $30,336 | $12,348 | $17,988 | $19,762 | $2,224 | 12.719% |
| 2016FY 2016/17 | $20,870 | $172 | $20,698 | $15,745 | $1,726 | 12.892% |
| 2015FY 2015/16 | $16,281 | $171 | $16,110 | $13,434 | $1,428 | 12.883% |
| 2014FY 2014/15 | $15,955 | $3,670 | $12,285 | $11,923 | $1,231 | 12.855% |
| 2013FY 2013/14 | $15,373 | $3,670 | $11,703 | $10,479 | $1,082 | 13.145% |
| 2012FY 2012/13 | $10,248 | $3,670 | $6,578 | $9,151 | $908 | 13.181% |
| 2011FY 2011/12 | $9,317 | $3,670 | $5,647 | $9,742 | $1,005 | 13.433% |
| 2010FY 2010/11 | $8,731 | $3,670 | $5,061 | $10,515 | $1,404 | 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.
Where an abatement applies, Property Tax is the amount owed after it. Abatements are granted to the property and do not necessarily transfer to a new owner.
Figures are the New York City Department of Finance assessment roll for tax lot 3044231047. 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.
About The Building
12399 FLATLANDS Avenue
12399 FLATLANDS Avenue, Brooklyn, NY 11207
A building in New Lots, currently featuring 1 active listing.
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Available Residences
| 9E | 2 | 1 | 966 sqft | $399 | $385,000 | Jul 26, 2026 | 48 days |
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Neighborhood Context
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Location Context
New Lots
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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.