Brick Duplex with Finished
New
For Sale
$2,899,000
4423 9th Avenue, Brooklyn, NY 11220
Residential, Brooklyn, NY
Property Size2,840 SF
Lot Size0.05 Acres
Price / SF$1,020
Days on Market6
Property Features for 4423 9th Avenue
General Information
Property type
Residential Multi Family
Property subtype
Other
Zoning
R6
Bedrooms
8
Bathrooms
6
Full bathrooms
4
Half bathrooms
2
Rooms
Bedroom 3, Bedroom 2, Bedroom 1, Bathroom 6, Bathroom 3, Bathroom 1, Bathroom 2, Bathroom 4, Bedroom 7, Bedroom 5, Bedroom 4, Bedroom 6, Bedroom 8, Bathroom 5
Interior features
Dishwasher, Microwave, Refrigerator, Stove
Basement
Full, Finished
Subdivision
Sunset Park
Standard status
Active
Size
2,840 SF
Lot size
0.05 Acres
Taxes and HOA fees
Tax Annual Amount
10956
Building Details
Year built
1925
Floors in Building
2
Number of units
2
Flooring type
Parquet Wood, Tile, Hardwood, Carpet
Building materials
Brick
Roof type
Flat
Listing Agency:
RE/MAX Real Estate Professiona
(718) 532-2000
Listed By:
Billy Apter · License #BEA5721
(347) 721-6599
Added: Sep 16
Changed: Sep 17
Last Checked: Sep 21 at 7:06PM
MLS# 504613
Copyright © 2026 Brooklyn New York Multiple Listing Service. All rights reserved. All information provided by the listing agent/broker is deemed reliable but is not guaranteed and should be independently verified.
Investment Insights
Based on property information with market context.
This 2,840-square-foot duplex is a corner, semi-detached brick residence built in 1925. The home occupies a 25x100 lot and has a 20x71 house size. The second floor provides four bedrooms, two full bathrooms, a kitchen, living room, and dining room. The first floor includes three bedrooms, one and one-half bathrooms, a kitchen, living room, and dining room. A full finished basement adds a family room, recreation room, media room, summer kitchen, and bathrooms, with separate entrances. A private driveway accommodates three cars. Interior features include a dishwasher, microwave, refrigerator, and stove, with parquet wood, hardwood, tile, and carpet flooring.
The property is located at 4423 9th Avenue in Brooklyn, NY 11220, within the Sunset Park/Boro Park area. The source information identifies nearby transportation, shopping along 8th Avenue and Fort Hamilton Parkway, schools, and houses of worship. The property is zoned R6.
The property is located at 4423 9th Avenue in Brooklyn, NY 11220, within the Sunset Park/Boro Park area. The source information identifies nearby transportation, shopping along 8th Avenue and Fort Hamilton Parkway, schools, and houses of worship. The property is zoned R6.
Key Highlights
- 2,840‑square‑foot duplex on a 25x100 lot
- 20x71 house size with corner, semi‑detached brick construction
- Full finished basement with separate entrances
Financial Insights
Estimated NOI and Cap Rate
NOI = area × lease_rate × (100 − vacancy) / 100 × (1 − expense_ratio). Net Operating Income — what the owner takes home each year before mortgage payments and income tax. Effective rent (asking rent minus vacancy losses) minus operating costs (taxes, insurance, maintenance, management).
NOI / Yr
$84,560
Cap rate = NOI / list price × 100. Capitalization rate — annual return on a fully cash purchase, before financing. NOI divided by price. Higher means more income per dollar invested, but usually also more risk or older condition. 5–8% is typical for stabilized commercial property; double digits often signal distressed deals.
Cap Rate
2.92%
Suggested Prices Based on Cap Rates
Cap rates vary significantly by property type, market, and asset quality.
Typical U.S. stable-market ranges:
Multifamily — 4.5% to 6.5% (Class A in primary markets often sub-5%; Class C in secondary markets 6%+)
Industrial / Logistics — 5.0% to 7.0% (compressed heavily in recent years due to e-commerce demand)
Office — 6.5% to 9%+ (wide spread post-2020; CBD Class A vs. suburban Class B varies dramatically)
Retail — 5.5% to 8.5% (grocery-anchored on the low end, unanchored strip centers higher)
Hospitality / Hotels — 7.5% to 10%+ (higher due to operational risk)
Self-Storage — 5.5% to 7.5%
Medical Office — 6.0% to 7.5%
Net Lease (single tenant, credit) — 5.0% to 7.0% depending on tenant credit and lease term
Rules of thumb:
Primary markets (NYC, SF, LA, Boston, DC) trade at lower cap rates than secondary/tertiary markets, often by 100–200 bps (bps, aka basis points; 1 bp = 0.01%).
Class A assets trade ~50–150 bps tighter than Class B, and Class B tighter than Class C.
Cap rates move inversely with price — a lower cap rate means a higher price for the same NOI.
Spread to the 10-year Treasury is a common benchmark; historically 200–400 bps over the 10-year.
Cap Rate 5%
$1,691,200
$1.7M
Cap Rate 7%
$1,208,000
$1.2M
Cap Rate 9%
$939,556
$939.6K
Market Conditions
NOI Build-Up for 2,840 SF
Vacancy — income lost from leasable area expected to sit empty during the year, subtracted from gross rent.
EGI (Effective Gross Income) — gross rent minus vacancy losses, the realistic income before paying operating costs.
OpEx (Operating Expenses) — recurring costs to operate the property (property tax, insurance, utilities, maintenance, management); excludes financing and capital improvements.
NOI (Net Operating Income) — income a property generates after operating costs but before financing and taxes.
Gross rent
$126.1K $44.40/SF
− Vacancy
−$5.3K −$1.86/SF
EGI
$120.8K $42.54/SF
− OpEx
−$36.2K −$12.76/SF
NOI
$84.6K $29.77/SF
Area
ZIP 11220
Vacancy
4.20%
Lease Rate
$44.40 /SF/Yr
Expense Ratio
30.00%
Simulate Cap Rate and NOI
Suggested Prices Based on Cap Rates
Cap rates vary significantly by property type, market, and asset quality.
Typical U.S. stable-market ranges:
Multifamily — 4.5% to 6.5% (Class A in primary markets often sub-5%; Class C in secondary markets 6%+)
Industrial / Logistics — 5.0% to 7.0% (compressed heavily in recent years due to e-commerce demand)
Office — 6.5% to 9%+ (wide spread post-2020; CBD Class A vs. suburban Class B varies dramatically)
Retail — 5.5% to 8.5% (grocery-anchored on the low end, unanchored strip centers higher)
Hospitality / Hotels — 7.5% to 10%+ (higher due to operational risk)
Self-Storage — 5.5% to 7.5%
Medical Office — 6.0% to 7.5%
Net Lease (single tenant, credit) — 5.0% to 7.0% depending on tenant credit and lease term
Rules of thumb:
Primary markets (NYC, SF, LA, Boston, DC) trade at lower cap rates than secondary/tertiary markets, often by 100–200 bps (bps, aka basis points; 1 bp = 0.01%).
Class A assets trade ~50–150 bps tighter than Class B, and Class B tighter than Class C.
Cap rates move inversely with price — a lower cap rate means a higher price for the same NOI.
Spread to the 10-year Treasury is a common benchmark; historically 200–400 bps over the 10-year.
Cap Rate 5%
$1,691,200
Cap Rate 7%
$1,208,000
Cap Rate 9%
$939,556
Alternative Uses
Best Use
Multifamily LT 5
$1.21M
$1.06M – $1.41M
NOI $84,560 @ 7.0% cap · market cap 2.92%
Second Best
Apartment 5plus
$1.08M
$946.7K – $1.26M
NOI $75,733 @ 7.0% cap · market cap 2.61%
Theoretical Best
Office A
$1.84M
$1.61M – $2.15M
NOI $128,877 @ 7.0% cap · market cap 4.45%
Zoning and permitted uses should be independently verified with authorities.
Property Analytics
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Current Use
Lease Details
2
Residential units
Location Intelligence
Trade Area within ½ mile
6,877
Businesses Nearby
Explore this area
Business Placement
Demographics for 11220, NY
105,797
Population
30,897
Households
3.4
Avg Household Size
35
Median Age
25%
College-Educated
62%
High-School Grad
1.7 sq mi
ZIP Area
62,234
Density / Sq Mi
$64,201
Median Household Income
$31,489
Median Earnings
$1,688
Median Rent
$1,021,200
Median Home Value
Check the figures for this property
Cap Rate, Value Estimation, Potential NOI and more
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Market
Vacancy Rate% for Multifamily in Northeast region
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Frequently Asked Questions
What type of property is this?
Duplex - Corner two-family residence with separate basement access, private driveway, and three-car parking.
Where is this duplex located?
The property is located at 4423 9th Avenue Brooklyn, NY.
What is the asking price?
The asking price for this property is $2,899,000.
What are key features of this property?
This property features: 2,840‑square‑foot duplex on a 25x100 lot; 20x71 house size with corner, semi‑detached brick construction; Full finished basement with separate entrances
