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    Park Slope Loft Building Title is generated by Realmo AI

    676 Union St, Brooklyn, NY 11215

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    For Sale
    $6,850,000

    Other - Brooklyn, NY

    Type:Multi Family
    Property size:
    6,500 SF
    Price / SF:
    $1,053/SF
    Added:
    Mar 10, 2026
    Days on Market:
    71
    Last Refresh:
    May 19 at 8:06 am

    Property Features for 676 Union St

    General Information

    Property type
    Other
    Property subtype
    Multi Family
    Bedrooms
    6
    Bathrooms
    5
    Rooms
    Bathroom 1, Bathroom 2, Bathroom 3, Bathroom 4, Bathroom 5, Bedroom 1, Bedroom 2, Bedroom 3, Bedroom 4, Bedroom 5
    Exterior features
    Private Yard
    Standard status
    Active
    Size
    6,500 SF

    Building Details

    Year built
    1920
    Flooring type
    Wood
    Roof type
    Other
    Architectural style
    Other

    We can help!

    Listing Contact
    Donald Brennan

    Listing agent Donald Brennan

    Listing office Engel & Völkers Brooklyn Cobble Hill 221A Court Street, Brooklyn, NY

    Listing date Mar 10, 2026

    MLS# AM-5509147 Listing URL

    Copyright © 2026 Engel & Völkers. All rights reserved. All information provided by the listing agent/broker is deemed reliable but is not guaranteed and should be independently verified.

    HighLights

    • Rare 25‑foot‑wide loft building with over 6,500 sq ft in prime Park Slope location.
    • Versatile architectural canvas suitable for a grand single‑family estate, two condos, or two duplex residences.
    • Private rooftop with sweeping city views and a secluded, south‑facing Mediterranean‑inspired garden.
    • Ground‑level art gallery and studio with private entrance, kitchenette, and powder room.
    • Six bedrooms and four and a half bathrooms.
    • Legacy wood‑burning fireplaces in each duplex.

    Overview

    Located in Park Slope, Brooklyn, this 25-foot-wide loft building offers over 6,500 square feet of living space. The property is configured as two duplex residences, each featuring a wood-burning fireplace and a graceful internal wood staircase. The structural integrity has been stripped to the original brick. The building includes six bedrooms and four and a half bathrooms. The upper floors offer panoramic city views, with 10-foot ceilings and two skylights on the fifth floor providing natural light. A private rooftop offers city views. The property also features a south-facing garden with Italian stone-tiled floors. A ground-level art gallery and studio, complete with a kitchenette and powder room, offers a private entrance. The building is a legal 2 Family with a non-commercial art space on the ground floor. The property is located in prime Brownstone Brooklyn, offering access to cultural and culinary amenities and connectivity to the city.
    Property Profile Insight Report Location Intelligence

    Current Use by Public Records

    Stairs New York Construction Company

    Suggested Use

    Law Firm Restaurant Real Estate Agency Spa & Massage Center Hair Salon Dental Office Nail Salon Food Market Grocery & Convenience Store Gym & Fitness Center

    Zoning and permitted uses should be independently verified with local authorities.

    Location Insight

    • Map
    • Local Demand
    City
    Brooklyn
    County
    Kings
    State
    New York
    Longitude
    -73.9812658
    Latitude
    40.6765222

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    FAQs

    What type of property is this?
    Mixed-use property - Rare 6,500 sq ft Brooklyn sanctuary with art gallery.
    Where is this mixed-use property located?
    The property is located at 676 Union St Brooklyn, NY.
    What is the asking price?
    The asking price for this property is $6,850,000.
    What are key features of this property?
    This property features: Rare 25‑foot‑wide loft building with over 6,500 sq ft in prime Park Slope location.; Versatile architectural canvas suitable for a grand single‑family estate, two condos, or two duplex residences.; Private rooftop with sweeping city views and a secluded, south‑facing Mediterranean‑inspired garden.
    (718) 643-6312
    We can help!
    Listing Contact
    Donald Brennan
    Learn More
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    Realmo Value Estimations

    Realmo estimates a property’s market value using a proprietary methodology that incorporates public data and user-submitted information. This cumulative value is generated by integrating a variety of conventional and innovative methods. 

    Disclaimer

    These figures are not official appraisals and should not be used as a substitute for a valuation performed by a licensed appraiser.
    Actual market value may differ due to factors not captured in the data. Estimates are offered for informational purposes only, and users should conduct independent research before making financial or investment decisions.
    By using this feature, you acknowledge that Realmo is not responsible for actions taken based on these estimates.

    AI approach

    Realmo AI Method estimates property value using machine learning models trained on millions of comparable listings, transactions, and market signals. It analyzes property features, location intelligence data, and current market dynamics to predict the most probable market value in real time.

    Realmo CapRate Calculation

    Realmo calculates the Capitalization Rate (Cap Rate) to help estimate a property's potential return on investment. The Cap Rate is a fundamental metric in commercial real estate that measures the relationship between a property's net operating income and its market value.

    How We Calculate Cap Rate

    Cap Rate Formula:
    Cap Rate (%) = (Net Operating Income / Property Value) × 100

    Net Operating Income (NOI) Formula:
    NOI = Area × Lease Rate × (1 - Vacancy Rate) × (1 - Operating Expense Ratio)

    Components

    Net Operating Income (NOI) represents the annual income a property generates after operating expenses:

    • Area: Building square footage from property records
    • Lease Rate: Annual $/sqft based on market data for the property type and geographic location
    • Vacancy Rate: Percentage of unoccupied space based on market data for the property type and location
    • Operating Expense Ratio: Operating costs as a percentage of income, varies by property type

    Property Value is derived from:

    • Recent sale price (if available)
    • Statistical models using comparable sales
    • AI-powered valuation estimates

    Example Calculation

    For a 100,000 sqft Office Building:

    • Lease Rate: $25.00/sqft/year (market data for Office in this area)
    • Vacancy Rate: 8% (market data for Office in this area)
    • Operating Expense Ratio: 35% (typical for Office properties)
    • Property Value: $15,000,000

    Step 1: Calculate NOI

    NOI = 100,000 × $25.00 × (1 - 0.08) × (1 - 0.35)
    NOI = 100,000 × $25.00 × 0.92 × 0.65
    NOI = $1,495,000/year

    Step 2: Calculate Cap Rate

    Cap Rate = ($1,495,000 / $15,000,000) × 100
    Cap Rate = 9.97%

    Property Type Considerations

    Net Operating Income calculations vary by property type due to different operating expense ratios:

    • Office: Higher expenses (30-40%) for HVAC, utilities, maintenance
    • Retail: Moderate expenses (25-35%) for common area maintenance
    • Industrial/Warehouse: Lower expenses (15-25%) for minimal tenant services
    • Multifamily: Moderate expenses (35-45%) including property management
    • Self-Storage: Lower expenses (25-35%) due to minimal maintenance

    Market lease rates and vacancy rates are specific to each property type and geographic location, reflecting local market conditions.

    Disclaimer

    These calculations are estimates for informational purposes only and should not be used as a substitute for professional financial analysis or appraisal.

    • Cap Rate calculations depend on market data that may change over time
    • Actual operating expenses, lease rates, and vacancy rates may differ from market averages
    • Individual property conditions, lease terms, and tenant quality significantly impact actual NOI
    • Property value estimates are approximations and not official appraisals
    • Cap rates vary widely by market, property condition, and investment risk profile

    Professional Guidance Recommended: Before making any investment or financial decisions, consult with licensed appraisers, commercial real estate brokers, and financial advisors who can evaluate your specific property and circumstances.
    By using this feature, you acknowledge that Realmo is not responsible for investment decisions or actions taken based on these estimates.

    Cap approach

    Capitalization Method calculates value based on estimated net operating income (NOI) and applying a market-based capitalization rate (cap rate), we estimate what a typical investor might be willing to pay for it.

    Comparable approach

    Comparable estimate is based on recent sales of similar nearby properties, adjusted for factors like size, condition, and location.

    Relative

    Relative property class coefficient uses factors that account for typical price differences between various asset types (e.g., retail vs. industrial) to provide a more accurate market-aligned estimate.

    Geo

    Comparable Sales Method, enhanced by Geo coefficients — location-based adjustment factors that reflect differences in price levels across neighborhoods, cities, or regions ensuring a more accurate, market-sensitive valuation.

    Stat Estimate

    This method estimates value based on actual market adjusted recent (~5 years) sales of comparable properties around by location and property type.

    • Ranges - area data calculated by industry standard IQR Outlier Removal Method
    • Range-from: 75% of all similar sales ($/sqft) are above this value
    • Range-to: 75% of all similar sales ($/sqft) are below this value
    AI Estimate

    This method estimates value based on AI market estimation of comparable properties around by location and property type.

    • Ranges - area data calculated by industry standard IQR Outlier Removal Method
    • Range-from: 75% of all estimations ($/sqft) are above this value
    • Range-to: 75% of all estimations ($/sqft) are below this value
    Alternative use

    Estimate considers the property’s potential value if used for a different purpose-based on zoning, demand, and market feasibility.

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